Patent application EP20173451A (EP), filed 2020-05-07
Publication number: EP3751019A1
Title: CARBIDE MATERIAL FOR CUTTING DEVICES AND ASSOCIATED METHOD OF MANUFACTURE
Abstract: There is provided a carbide material (34) comprising Tungsten Carbide of 60 to 85 weight%, Titanium Carbides of 10 to 25 weight% and preferably a metal matrix of 0.5 to 20 weight% comprising Fe and optionally at least one or both of the metals Co or Ni. There is also provided a device comprising a ferrous substrate and such a carbide material and a method of manufacturing a device, the method comprising mixing powders comprising Carbon, Tungsten and a scavenger material such as Titanium, placing the mixed powders proximal a ferrous substrate (10), impinging an energy source (31) onto the powdered materials to create a melt pool (32) formed of the powders and the material of the substrate, and allowing the melt pool to solidify to form a carbide material (34) substantially free from Iron Tungsten carbides of (W, Fe)<sub>6</sub> C and (W, Fe)<sub>12</sub> C type.
IPC codes: B22F   5/    00            A I
B22F   7/    04            A I
B22F   7/    08            A I
C22C  29/    06            A I
C23C  24/    10            A I
C23C  26/    02            A I
Claims: number: 1
text: A carbide material comprising Tungsten Carbide of 60 to 85 weight%, Titanium carbides of 10 to 25 weight%.
number: 2
text: A carbide material according to claim 1, further comprising a metal matrix of 0.5 to 20 weight% comprising Fe.
number: 3
text: A carbide material according to claim 2, wherein the metal matrix is in the range 4.5 to 20 weight%.
number: 4
text: A carbide material according to claim 2 or claim 3, wherein the metal matrix further comprises at least one or both of the metals Co or Ni.
number: 5
text: A carbide material according to claim 2 or claim 3, wherein the metal matrix comprises Co and Fe.
number: 6
text: A carbide material according to any of the preceding claims, further comprising additional compounds in the range 0.5 to 8 weight%, the additional compounds being one or more of TaC, VC, NbC, HfC, ZrC, Cr<3>C<2> and Cr<7>C<3>.
number: 7
text: A carbide material according to any of the preceding claims, wherein spherical carbides within the material have a grain size of 1 to 5 µm in diameter.
number: 8
text: A device comprising a ferrous substrate and a carbide material according to any of claims 1 to 7 formed on at least part of the ferrous substrate.
number: 9
text: A method of manufacturing a device, the method comprising mixing powders comprising Carbon, Tungsten and a scavenger material, placing the mixed powders proximal a ferrous substrate, impinging an energy source onto the powdered materials to create a melt pool formed of the powders and the material of the substrate, and allowing the melt pool to solidify to form a carbide material substantially free from Iron Tungsten carbides of (W, Fe)<6> C and (W, Fe)<12> C type.
number: 10
text: A method of manufacture according to claim 9, wherein the carbide material contains no more than 0.01% Iron Tungsten carbides of (W, Fe)<6> C and (W, Fe)<12> C type.
number: 11
text: A method of manufacture according to claim 9, wherein the carbide material contains no more than 0.001% Iron Tungsten carbides of (W, Fe)<6> C and (W, Fe)<12> C type.
number: 12
text: A method of manufacture according to any of claims 9 to 11, wherein the scavenger material is Titanium being 10 to 25 weight% of the carbide material.
number: 13
text: A method of manufacturing a cutting device, the method comprising mixing powders comprising Carbon, Tungsten and Titanium, placing the mixed powders proximal a ferrous substrate, impinging an energy source onto the powdered materials to create a melt pool formed of the powders and the material of the substrate, allowing the melt pool to solidify to form a carbide material comprising Tungsten Carbide of 60 to 85 weight% and Titanium Carbide of 10 to 25 weight%.
number: 14
text: A method of manufacture according to any of claims 9 to 13, wherein the powders further comprise at least one, or a mixture of, the metals Co or Ni.
number: 15
text: A method of manufacture according to any of claims 9 to 14, wherein the powders further comprise one or more of materials: Ta, V, Nb, Hf, Zr and Cr .
number: 16
text: A method of manufacture according to any of claims 9 to 15, wherein the melt pool is formed at a temperature of 1500 to 3000°C.
number: 17
text: A method of manufacture according to any of claims 9 to 16, wherein the energy source produces power between 300W to 2kW.
number: 18
text: A method of manufacture according to any of claims 9 to 17, further comprising moving the ferrous substrate relative to the energy source at a traverse speed of between 0.01m/min-6m/min.
Office action: search_report, dated 2020-12-16
Rejection reasons: novelty_epc_54
Prior art cited: ref_id: CN109023361B
ref_type: patent
severity: background
ref_id: CN108165988A
ref_type: patent
severity: background
ref_id: GB861349A
ref_type: patent
severity: background
ref_id: CN108359975A
ref_type: patent
severity: background
ref_id: CN108300993A
ref_type: patent
severity: background
ref_id: CN106435581A
ref_type: patent
severity: background
ref_id: CN109023361A
ref_type: patent
severity: background
ref_id: US2012258273A1
ref_type: patent
severity: background
ref_id: GB861349
ref_type: patent
severity: novelty_destroying
ref_id: US2012258273
ref_type: patent
severity: novelty_destroying
ref_id: CN106435581
ref_type: patent
severity: novelty_destroying
ref_id: CN108165988
ref_type: patent
severity: novelty_destroying
ref_id: CN108300993
ref_type: patent
severity: novelty_destroying
ref_id: CN108359975
ref_type: patent
severity: novelty_destroying
ref_id: CN109023361
ref_type: patent
severity: novelty_destroying
Final disposition: pending (2020-12-16)