Patent ID: 11965227
Assignee: CHONGYI ZHANGYUAN TUNGSTEN CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A metal ceramic, characterized in comprising: a hard phase and a binder phase;
wherein the hard phase has not less than 4 kinds, which is at least one of carbides, nitrides, or nitrocarbides and the solid solutions thereof of at least one metal element in Groups IVB, VB, and VIB of the Periodic Table of Elements, comprising:
the first hard phase in the form of a black core, mainly comprising titanium carbide, titanium nitride, and titanium nitrocarbide, and in the scanning electron microscope photograph, at least 50% of which have a particle size greater than 1 μm; wherein the first hard phase has a composition of a single-phase crystal grain, a partial ring phase, and a phase having a core-ring structure, and comprises, in the scanning electron microscope photograph, the first hard phase 1a in the form of a black titanium nitrocarbide, the first hard phase thin ring 1b and the first hard phase thick ring 1c accounting for 5 to 20% of the area of the first hard phase; wherein the ring-free structure 1a and the thin ring 1b account for more than 80%, and the particles constituting the first hard phase 1a are only composed of Ti(C, N), and the thin ring 1b and the thick ring 1c are formed by the partial solid solution of the refractory metal carbide around Ti(C, N);
the second hard phase in the form of a dark gray core-ring structure, mainly comprising titanium carbide, titanium nitride, 1 to 20 wt % niobium carbide and molybdenum carbide, and the above-mentioned nitrocarbide solid solution; wherein the second hard phase is, in the scanning electron microscope photograph, in the form of a dark gray core-ring structure, and the core-ring structure comprises a composition of a core phase which is formed by the solid solution of 1 to 20 wt % of a composite carbite of at least one metal other than titanium selected from the metals in Groups IVB, VB, and VIB of the Periodic Table of Elements in Ti(C, N), and a ring phase that completely covers the core;
the third hard phase in the form of a high-brightness white core-grey ring structure, mainly comprising tungsten carbide, tantalum carbide, zirconium carbide, and the above-mentioned carbide solid solution, wherein the third hard phase is, in the scanning electron microscope photograph, in the form of a high-brightness white core-gray ring structure, wherein the high-brightness white core phase is a solid solution formed by carbides of at least two metal elements in Groups IVB, VB, and VIB, and wherein the high-brightness white core is a mixed structure of strip and spherical shape, and more than 50% of the white core has an aspect ratio of greater than 3, and a particle width of less than 0.4 μm; and wherein in the gray ring phase, a part of the core and the peripheral part are composed of the same element, and are formed by a composite carbonitride solid solution comprising at least Ti and W; and the W concentration of the core phase is higher than that of the ring phase; and
the fourth hard phase in the form of a gray-white core-gray ring structure, mainly comprising tungsten carbide, titanium carbide, vanadium carbide, titanium nitride, and the above-mentioned nitrocarbide solid solution; wherein the fourth hard phase has a composition of a single-phase crystal grain and a phase having a core-ring structure, in the scanning electron microscope photograph, in the form of a gray homogeneous structure comprising two structures of the fourth hard phase 4b and the off-white core-gray ring fourth hard phase 4a; and in the fourth hard phase, the ratio of the area of the homogeneous structure fourth hard phase 4b to the area of the fourth hard phase is 20 to 50%;
wherein the binder is white and is at least one of cobalt and nickel.