Patent Publication Number: US-2019180926-A1

Title: Electronic component

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims benefit of priority to Japanese Patent Application No. 2017-236093, filed Dec. 8, 2017, the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an electronic component. 
     Background Art 
     An electronic component, such as a coil component, has external electrodes that connect the electronic component to a printed circuit board as described, for example, Japanese Unexamined Patent Application Publication No. 2013-201374. The external electrode includes a metal layer, such as a chromium (Cr) layer, that is formed by, for example, sputtering. 
     SUMMARY 
     In an electronic component, adhesion of an external electrode is sometimes insufficient. This decreases connection strength (bonding strength) of the electronic component to the printed circuit board, and thus, connection stability may be decreased. 
     Accordingly, the present disclosure provides an electronic component having high bonding strength. 
     According to one embodiment of the present disclosure, the electronic component includes a molded body containing a magnetic powder resin in which a resin serves as a binder, an oxide film covering at least a portion of a surface of the molded body, and an external electrode including a base layer formed on a surface of the oxide film. The base layer is a metal layer having high affinity for oxygen. This configuration results in high adhesion between the molded body and the oxide film and between the base layer of the external electrode and the oxide film covering the molded body, thereby improving bonding strength of the electronic component to a printed circuit board. 
     The above-described electronic component preferably contains at least one of Cr, Ti, V, Sc, Mn, Y, Zr, Nb, Mo, Tc, Hf, Ta, W, and Re. This configuration provides a metal layer having high affinity specifically for oxygen. 
     In the above-described electronic component, the oxide film preferably contains a metal oxide to which an organic chain is bonded. This configuration further improves the bonding strength of the electronic component to a printed circuit board. 
     In the oxide film of the above-described electronic component, the amount of a metal element to which an organic chain is bonded is preferably about 0.5-fold or more and about 1.5-fold or less (i.e., from about 0.5-fold to about 1.5-fold) the amount of a metal element to which no organic chain is bonded. This configuration reliably improves thermal-shock resistance. 
     In the above-described electronic component, the oxide film preferably contains TiO or SiO. This configuration improves mass productivity. 
     In the above-described electronic component, the organic chain preferably contains any of an epoxy group, an amino group, an isocyanurate group, an imidazole group, a vinyl group, a mercapto group, a phenol group, and a methacryloyl group. This configuration further reliably improves thermal-shock resistance. 
     In the above-described electronic component, the binder is preferably an epoxy resin. This configuration further improves bonding strength and insulating properties. 
     In the above-described electronic component, it is preferable that the molded body be wound with a wire and that an end portion of the wire be connected to the external electrode. This configuration provides a wire-wound coil component having high bonding strength with respect to a printed circuit board. 
     In the above-described electronic component, it is preferable that the oxide film be further interposed between the wire and the molded body. This configuration suppresses generation of a leakage current path from the wire through the molded body. 
     In the above-described electronic component, the oxide film preferably covers the entire surface of the molded body. This configuration provides high insulating properties. 
     According to an aspect of the present disclosure, an electronic component having an improved bonding strength with respect to a printed circuit board is provided. 
     Other features, elements, characteristics and advantages of the present disclosure will become more apparent from the following detailed description with reference to the attached drawing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       The FIGURE is a schematic cross-sectional view of a wire-wound coil component. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments according to an aspect of the present disclosure will be described. 
     To facilitate understanding, components may be enlarged in the accompanying drawing. The size and proportion of the components may differ from those of the actual components or those of the components in other FIGURES. In a cross-sectional view, hatching is used to facilitate understanding; however, hatching may be omitted in some of the components. 
     A wire-wound coil component  1  illustrated in the FIGURE is an example of the electronic component. The wire-wound coil component  1  includes a core  10 , a wire  20  wound around the core  10 , external electrodes  30  connected to the wire  20 , and a covering resin  40  sealing the wire  20  wound around the core  10 . 
     The core  10  includes a core main body  11  serving as a molded body and an oxide film  12 . The external electrode  30  includes a base layer  31  and a plating layer  32 . 
     The core main body  11  includes a wound core portion  13  extending in a vertical direction and flange portions  14  and  15  respectively formed at the upper end and lower end of the wound core portion  13 . The surface of the core main body  11  includes a ground portion. The ground portion is a surface formed by predetermined grinding treatment during formation of the core main body  11 . The predetermined grinding treatment may be barrel finishing. The upper side and the lower side in the present specification is determined based on a direction perpendicular to the main surface of a printed circuit board on which the electronic component is mounted. The lower side is a side near the printed circuit board in the above-mentioned direction, and the upper side is the side opposite to the lower side. 
     The core main body  11  contains a magnetic powder resin containing, for example, a resin and a metal powder. Specifically, the core main body  11  is a molded body containing a magnetic powder resin that contains a magnetic metal powder and a resin serving as a binder. The resin is preferably an epoxy resin. This further improves bonding strength and insulating properties. Examples of the resin include thermosetting resins, such as a phenol resin and a silicone resin, in addition to the above-described epoxy resin. The core main body  11  is obtained, for example, by mixing a magnetic metal powder with the above-described binder, molding the mixture by using a mold, and applying heat to harden the binder. 
     The magnetic metal powder may be a metal powder of pure iron (Fe) or an Fe alloy. Examples of such an Fe alloy include FeNi, FeCo, FeSi, FeSiCr, FeSiAl, FeSiBCr, and FePCSiBNbC. Theses powders may be used alone or in a combination of two or more. A carbonyl iron powder formed by heat-decomposing pentacarbonyl iron may be used instead of the above-described pure iron powder. 
     The core main body  11  is covered by the oxide film  12 . In the present embodiment, the oxide film  12  is formed so as to cover the entire surface of the core main body  11 . The oxide film  12  does not necessarily cover the entire surface of the core main body  11  and may partially cover the surface of the core main body  11 . To be interposed between the wire  20  and the core main body  11 , the oxide film  12  may be formed so as to cover a surface of the wound core portion  13  that is wound by the wire  20  (side surface  13   a  of the wound core portion  13 ) and internal side surfaces  14   a  and  15   a  of the flange portions  14  and  15  with which the wire  20  is otherwise in contact. The oxide film  12  may further cover a portion of the lower surface of the flange portion  15 . In a case where the oxide film  12  is a film covering the entire surface of the core main body  11 , producing a mask and patterning are unnecessary when the oxide film  12  is formed. Thus, the oxide film  12  can be effectively formed. 
     The oxide film  12  is formed so as to be interposed at least between each of the external electrodes  30 , which will be described later, and the core main body  11 . In particular, the oxide film  12  is preferably formed so as to entirely cover a lower surface  15   b  of the flange portion  15  where the external electrodes  30  are formed. 
     The oxide film  12  is a film containing a metal oxide. Examples of such a metal oxide include titanium oxide (TiO), silicon oxide (SiO), aluminum oxide (AlO), and zirconium oxide (ZrO). In particular, from the viewpoint of improving mass productivity, the oxide film  12  preferably contains a titanium oxide or a silicate compound. These metal oxides are preferred from the viewpoint of strength and specific resistance. In the present embodiment, the oxide film  12  contains any of these metal oxides (TiO, SiO, AlO, and ZrO) to which an organic chain is bonded, such as a titanium-based alkoxide or a silicon-based alkoxide, or specifically, a titanium alkoxide, a titanium acylate, or a titanium chelate. The organic chain preferably contains any of an epoxy group, an amino group, an isocyanurate group, an imidazole group, a vinyl group, a mercapto group, a phenol group, and a methacryloyl group. The oxide film  12  may be formed by, for example, sol-gel processing. The oxide film  12  in the present embodiment, which has a structure containing a metal oxide to which an organic chain is bonded (organic-inorganic hybrid structure), may be formed by mixing a sol-gel coating agent containing a metal alkoxide and a silane coupling agent containing an organic chain with each other, applying the mixed solution to the surface of the core main body  11 , performing dehydration-bonding by heat treatment, and performing drying at a predetermined temperature. 
     The external electrode  30  is formed at each of two portions of the lower surface of the core  10 , that is, at each of two portions of the lower surface (outer surface) of the oxide film  12 . The external electrode  30  includes the base layer  31  and the plating layer  32 . The base layer  31  and the plating layer  32  are formed on the lower surface of the oxide film  12  in this order. 
     The base layer  31  is a metal layer having high affinity for oxygen. The base layer  31  preferably contains at least one of, for example, chromium (Cr), titanium (Ti), vanadium (V), scandium (Sc), manganese (Mn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), hafnium (Hf), tantalum (Ta), tungsten (W), and rhenium (Re). This improves adhesion of the base layer  31  to the oxide film  12 . In particular, the base layer  31  preferably contains any of Cr, Ti, and V. This further improves adhesion of the base layer  31  to the oxide film  12 . The base layer  31  is not limited to a metal layer formed of a single metal of the above-described metals and may include an alloy of the above-described metals, such as Ni—Ti, Ni—V, or Ni—Cr. The base layer  31  may be formed by sputtering. The method for forming the base layer  31  is not limited to sputtering and may be a known method for forming a metal layer, such as vapor deposition, atomic layer deposition, or plating. 
     The plating layer  32  may be formed of a metal, such as nickel (Ni), copper (Cu), silver (Ag), or tin (Sn), or an alloy, such as Ni—Cr (chromium) or Ni—Cu. The plating layer  32  may be formed by electroplating. The plating layer  32  may include a plurality of metal layers (plating layers). 
     The wire  20  is a wire that includes, for example, a substantially linear conductor, such as Cu, and an insulation coating, such as a resin, covering the surface of the conductor. The wire  20  is wound around the wound core portion  13  of the core  10 . Each of the end portions of the wire  20  is connected to the external electrode  30  by, for example, plating or thermo-compression bonding. This enables the wire-wound coil component  1  to be superior to a stacked-layer coil component in terms of properties. The wire  20  is sealed by the covering resin  40  disposed between the flange portions  14  and  15  of the core  10  except for portions of the wire that each extend to a portion connected to the external electrode  30 . The covering resin  40  may be a magnetic resin included in the examples of the material of the core main body  11 . In the present embodiment, the magnetic resin may be an epoxy resin containing a magnetic metal powder. 
     Effects 
     The wire-wound coil component  1  is an electronic component including the core main body  11  (molded body) containing a magnetic powder resin in which a resin serves as a binder, the oxide film  12  covering at least a portion of the surface (lower surface) of the core main body  11 , and the external electrode  30  including the base layer  31  formed on the surface of the oxide film  12 . The base layer  31  is a metal layer having high affinity for oxygen. 
     As described above, in the wire-wound coil component  1 , the base layer  31  is a metal layer having high affinity for oxygen. Thus, the base layer  31  strongly interacts with the oxygen of the oxide film  12  and forms, for example, a covalent bond. This improves adhesion between the external electrode  30  and the core  10  (oxide film  12 ). Therefore, the wire-wound coil component  1  has improved bonding strength with respect to a printed circuit board. 
     The oxide film  12  contains a metal oxide to which an organic chain is bonded. The core main body  11  contains a magnetic powder resin in which a resin serves as a binder. Having an organic chain, the oxide film  12  strongly interacts with the resin of the core main body  11  and forms, for example, a covalent bond. This improves the adhesion between the oxide film  12  and the core main body  11 . Therefore, the bonding strength of the wire-wound coil component  1  to a printed circuit board is further improved. 
     For example, if a glass film is used as an insulating film covering the core main body  11 , thermal shock may cause a crack in the insulating film and thus, the insulating properties may be decreased. On the other hand, the oxide film  12  in the present embodiment contains a metal oxide to which an organic chain is bonded. This provides flexibility to the oxide film  12  and thus, thermal shock is unlikely to cause a crack in the oxide film  12 . 
     As described above, the core main body  11  contains a magnetic powder resin in which a resin serves as a binder. During a producing process, after having been formed, the core main body  11  may be ground. The grinding may be barrel finishing. The grinding leads to exposure of some of the magnetic metal powder contained in the core main body  11  to the surface of the core main body  11 . If the insulation coating of the wire  20  has a damaged portion, the exposed magnetic metal powder at the damaged portion may be in contact with the conductor of the wire  20 . This may decrease the insulation resistance (IR) of the wire-wound coil component  1 . On the other hand, the core  10  of the wire-wound coil component  1  includes the oxide film  12  covering the entire surface of the core main body  11 . Thus, the oxide film  12  is interposed between the wire  20  and the core main body  11  and covers some of the magnetic metal powder exposed by the above-described grinding to the surface of the core main body  11 . Therefore, high insulation resistance is obtained. 
     EXAMPLES 
     Next, each of the above-described embodiments will be further specifically described with reference to Examples and Comparative Examples. 
     Example 1 
     Production of Test Body 
     In the present Example, the core main body  11  was formed by using an epoxy resin. The epoxy resin was used as a binder. Specifically, a magnetic metal powder was mixed with the epoxy resin, and the mixture was molded by using a mold. The molded mixture was heated at a predetermined temperature to harden the epoxy resin, thereby forming a molded body serving as the core main body  11 . Then, after barrel finishing of the core main body  11 , the oxide film  12  containing TiO was formed on the surface of the core main body  11 . In this case, a silane coupling agent containing an organic chain was not used. The oxide film  12  was an oxide film containing TiO and was an inorganic film containing no organic chains. Then, the base layer  31  formed of an alloy containing Cr was formed by sputtering, and the plating layer  32  was formed to provide the external electrode  30 . 
     Measurement of Bonding Strength 
     A test body was mounted on a printed circuit board, for example, by using a solder paste. Regarding bonding strength (N) between the test body and the printed circuit board, bonding strength in an initial stage and bonding strength after a thermal-shock test were measured by a predetermined measuring method (in accordance with AEC-Q200). The measurement results are shown in Table 1. Table 1 shows a binder, an oxide film, a solution used (when the solution is a mixture, the ratio of the amount of a sol-gel coating agent (simply stated as “coating agent”) to the amount of a coupling agent containing an organic chain (simply stated as “coupling agent”)), a base layer, bonding strength (N), and bonding strength (N) (after the thermal-shock test) in the present Example 1 and in each of Examples 2 to 7 and Comparative Examples 1 and 2 that will be described later. 
     Example 2 
     A mixed solution in which a sol-gel coating agent containing TiO and a silane coupling agent containing an organic chain were mixed at a ratio of 2:1 was applied to the surface of the core main body  11  and subjected to heat treatment to form an oxide film having an organic-inorganic hybrid structure containing Si to which an organic chain is bonded and TiO. The resultant oxide film served as the oxide film  12 . In this case, in the oxide film  12 , the amount of Si to which an organic chain was bonded was about 0.5-fold the amount of Ti to which no organic chain was bonded. The binder was the epoxy resin and the base layer  31  was formed of the alloy containing Cr in the same manner as in Example 1. 
     Example 3 
     A mixed solution in which a sol-gel coating agent containing TiO and a silane coupling agent containing an organic chain were mixed at a ratio of 1:1 was applied to the surface of the core main body  11  and subjected to heat treatment to form an oxide film having an organic-inorganic hybrid structure containing Si to which an organic chain was bonded and TiO. The resultant oxide film served as the oxide film  12 . In this case, in the oxide film  12 , the amount of Si to which an organic chain was bonded was about 1.0-fold the amount of Ti to which no organic chain was bonded. The binder was the epoxy resin and the base layer  31  was formed of the alloy containing Cr in the same manner as in Example 1. 
     Example 4 
     A mixed solution in which a sol-gel coating agent containing TiO and a silane coupling agent containing an organic chain were mixed at a ratio of 2:3 was applied to the surface of the core main body  11  and subjected to heat treatment to form an oxide film having an organic-inorganic hybrid structure containing Si to which an organic chain was bonded and TiO. The resultant oxide film served as the oxide film  12 . In this case, in the oxide film  12 , the amount of Si to which an organic chain was bonded was about 1.5-fold the amount of Ti to which no organic chain was bonded. The binder was the epoxy resin and the base layer  31  was formed of the alloy containing Cr in the same manner as in Example 1. 
     Example 5 
     Only a silane coupling agent containing an organic chain was applied to the surface of the core main body  11  and subjected to heat treatment to form an oxide film having an organic-inorganic hybrid structure containing Si to which only an organic chain was bonded. The resultant oxide film served as the oxide film  12 . The binder was the epoxy resin and the base layer  31  was formed of the alloy containing Cr in the same manner as in Example 1. 
     Example 6 
     A mixed solution in which a sol-gel coating agent containing SiO and a silane coupling agent containing an organic chain were mixed at a ratio of 1:1 was applied to the surface of the core main body  11  and subjected to heat treatment to form an oxide film having an organic-inorganic hybrid structure containing Si to which an organic chain was bonded and SiO. The resultant oxide film served as the oxide film  12 . In this case, in the oxide film  12 , the amount of Si to which an organic chain was bonded was about 1.0-fold the amount of Si to which no organic chain was bonded. The binder was the epoxy resin and the base layer  31  was formed of the alloy containing Cr in the same manner as in Example 1. 
     Example 7 
     A mixed solution in which a sol-gel coating agent containing TiO and a silane coupling agent containing an organic chain were mixed at a ratio of 1:1 was applied to the surface of the core main body  11  and subjected to heat treatment to form an oxide film having an organic-inorganic hybrid structure containing Si to which an organic chain was bonded and TiO. The resultant oxide film served as the oxide film  12 . In this case, in the oxide film  12 , the amount of Si to which an organic chain was bonded was about 1.0-fold the amount of Ti to which no organic chain was bonded. In Example 7, the base layer  31  was formed of an alloy containing Ti. The binder was the epoxy resin in the same manner as in Example 1. 
     Comparative Example 1 
     The oxide film  12  was not included in the structure (stated as “none” in Table 1). The binder was the epoxy resin and the base layer  31  was formed of the alloy containing Cr in the same manner as in Example 1. 
     Comparative Example 2 
     The binder was a polysiloxane resin, and the oxide film  12  was not included in the structure (stated as “none” in Table 1). The base layer  31  was the alloy containing Cr. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                   
                   
                   
                   
                 Bonding 
               
               
                   
                   
                   
                   
                   
                   
                 strength (N) 
               
               
                   
                   
                   
                   
                   
                 Bonding 
                 (After 
               
               
                   
                   
                   
                 Solution used 
                   
                 strength 
                 thermal- 
               
               
                 No. 
                 Binder 
                 Oxide film 
                 (Coating agent/Coupling agent) 
                 Base layer 
                 (N) 
                 shock test) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Example 1 
                 Epoxy resin 
                 TiO contained 
                 Sol-gel coating agent containing TiO 
                 Alloy 
                 205 
                 140 
               
               
                   
                   
                   
                   
                 containing Cr 
               
               
                 Example 2 
                 Epoxy resin 
                 Organic-inorganic hybrid structure 
                 Sol-gel coating agent containing TiO 
                 Alloy 
                 215 
                 210 
               
               
                   
                   
                 containing Si to which an organic chain 
                 Silane coupling agent containing 
                 containing Cr 
               
               
                   
                   
                 is bonded and TiO 
                 an organic chain (2:1) 
               
               
                 Example 3 
                 Epoxy resin 
                 Organic-inorganic hybrid structure 
                 Sol-gel coating agent containing TiO 
                 Alloy 
                 215 
                 210 
               
               
                   
                   
                 containing Si to which an organic chain 
                 Silane coupling agent containing 
                 containing Cr 
               
               
                   
                   
                 is bonded and TiO 
                 an organic chain (1:1) 
               
               
                 Example 4 
                 Epoxy resin 
                 Organic-inorganic hybrid structure 
                 Sol-gel coating agent containing TiO 
                 Alloy 
                 210 
                 200 
               
               
                   
                   
                 containing Si to which an organic chain 
                 Silane coupling agent containing 
                 containing Cr 
               
               
                   
                   
                 is bonded and TiO 
                 an organic chain (2:3) 
               
               
                 Example 5 
                 Epoxy resin 
                 Organic-inorganic hybrid structure 
                 Silane coupling agent containing 
                 Alloy 
                 200 
                 200 
               
               
                   
                   
                 containing Si to which an organic chain 
                 only an organic chain 
                 containing Cr 
               
               
                   
                   
                 is bonded 
               
               
                 Example 6 
                 Epoxy resin 
                 Organic-inorganic hybrid structure 
                 Sol-gel coating agent containing SiO 
                 Alloy 
                 200 
                 200 
               
               
                   
                   
                 containing Si to which an organic chain 
                 Silane coupling agent containing 
                 containing Cr 
               
               
                   
                   
                 is bonded and SiO 
                 an organic chain (1:1) 
               
               
                 Example 7 
                 Epoxy resin 
                 Organic-inorganic hybrid structure 
                 Sol-gel coating agent containing TiO 
                 Alloy 
                 215 
                 215 
               
               
                   
                   
                 containing Si to which an organic chain 
                 Silane coupling agent containing 
                 containing Ti 
               
               
                   
                   
                 is bonded and TiO 
                 an organic chain (1:1) 
               
               
                 Comparative 
                 Epoxy resin 
                 None 
                 — 
                 Alloy 
                 40 
                 40 
               
               
                 Example 1 
                   
                   
                   
                 containing Cr 
               
               
                 Comparative 
                 Polysiloxane 
                 None 
                 — 
                 Alloy 
                 45 
                 45 
               
               
                 Example 2 
                 resin 
                   
                   
                 containing Cr 
               
               
                   
               
            
           
         
       
     
     Results 
     As shown in Table 1, regarding the bonding strength of the test body in Comparative Example 1 to a printed circuit board, each of the bonding strength in the initial stage and the bonding strength after the thermal-shock test was 40 (N). Regarding the bonding strength of the test body in Comparative Example 2 to a printed circuit board, each of the bonding strength in the initial stage and the bonding strength after the thermal-shock test was 45 (N). On the other hand, in each of Examples 1 to 7, the bonding strength with respect to a printed circuit board is 200 (N) or higher in the initial stage. In other words, it has been found that when the oxide film  12  and the external electrode  30  including the base layer  31 , which is a metal layer having high affinity for oxygen, are included, the bonding strength of the test body to a printed circuit board is improved. In each of Examples 2 to 7, in which the oxide film  12  is an oxide film having an organic-inorganic hybrid structure containing a metal oxide to which an organic chain is bonded, not only the bonding strength in the initial stage, but also the bonding strength after the thermal-shock test is 200 (N) or higher. In other words, it has been found that the oxide film  12  containing a metal oxide to which an organic chain is bonded also improves thermal-shock resistance. In Examples 1 to 7, high insulation resistance (IR) was obtained. 
     As described above, according to the preferred embodiments, the following effects are obtained. 
     (1) The wire-wound coil component  1  is an electronic component including the core main body  11  (molded body) containing a magnetic powder resin in which a resin serves as the binder, the oxide film  12  covering at least a portion of the surface (lower surface) of the core main body  11 , and the external electrode  30  including the base layer  31  formed on the surface of the oxide film  12 . The base layer  31  is a metal layer having high affinity for oxygen. The base layer  31  strongly interacts with oxygen of the oxide film  12  and forms, for example, a covalent bond, thereby improving adhesion between the external electrode  30  and the core  10  (oxide film  12 ). Therefore, the wire-wound coil component  1  has improved bonding strength with respect to a printed circuit board. 
     (2) The oxide film  12  is preferably an oxide film containing a metal oxide to which an organic chain is bonded, that is, an oxide film having an organic-inorganic hybrid structure. The core main body  11  contains a magnetic powder resin in which a resin serves as a binder. Thus, the organic chain of the oxide film  12  strongly interacts with the resin of the core main body  11  and forms, for example, a covalent bond. This improves the adhesion between the oxide film  12  and the core main body  11 . Therefore, the bonding strength of the wire-wound coil component  1  to a printed circuit board is further improved. 
     (3) The oxide film  12  preferably includes an organic chain. In this case, the oxide film  12  has flexibility. Thus, thermal shock does not decrease the bonding strength of the wire-wound coil component  1  to a printed circuit board, thereby improving thermal-shock resistance. 
     (4) It is preferable that the wire  20  be wound around the core main body  11  and that the oxide film  12  be interposed between the core main body  11  and the wire  20 . In this case, if some of a magnetic metal powder is exposed to the surface of the core main body  11 , the oxide film  12  covers the magnetic metal powder. Therefore, high insulation resistance is obtained. 
     (5) In the oxide film  12 , the amount of a metal element, such as Si or Ti, to which an organic chain is bonded is preferably about 0.5-fold of more and about 1.5-fold or less the amount of a metal element, such as Si or Ti, to which no organic chain is bonded. In this case, it has been found that the thermal-shock resistance is reliably improved. 
     The above-described embodiments may be implemented in the following modified examples. 
     In the above-described embodiments, the wire-wound coil component  1  has two external electrodes  30  on the flange portion  15 . The wire-wound coil component  1  may be so called a horizontally wire-wound coil component in which each of the two flange portions has an external electrode and in which the core portion is supported substantially parallel to a printed circuit board. The number of the external electrodes  30  may be more than two. 
     In the above-described embodiment, the flange portions  14  and  15  are respectively disposed at one end portion and the other end portion of the wound core portion  13  of the wire-wound coil component  1 . The size of the flange portions  14  and  15  may be appropriately changed individually. The flange portion  14  at the upper end of the wound core portion  13  may be omitted. 
     In the above-described embodiment, the wire-wound coil component  1  is illustrated as an electronic component. The electronic component may be a layer-stacked coil component. In this case, the molded body serves as an element body. In addition, examples of an electronic component having a molded body and external electrodes include capacitors using a dielectric body, piezoelectric elements using a piezoelectric body, and varistors using a semiconductor. 
     A part of the above-described embodiments and modifications may be appropriately replaced by known configurations. The above-described embodiments and modifications may be partly or entirely combined with other embodiments or examples. 
     While some embodiments of the disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the disclosure. The scope of the disclosure, therefore, is to be determined solely by the following claims.