A polycrystalline cubic boron nitride compact and a method for producing the same
By coating the surface of cubic boron nitride with high-melting-point silicide and sintering it with a cemented carbide matrix, the oxidation, diffusion, and chemical wear problems of polycrystalline cubic boron nitride tools under high-temperature turning conditions are solved, thereby improving their wear resistance and lifespan.
CN120519755BActive Publication Date: 2026-05-01SHENZHEN HAIMINGRUN SUPERHARD MATERIALS +1
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Patent Information
- Application Number
- CN202510654831.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-01
- Estimated Expiration
- 2045-05-21
AI Technical Summary
Technical Problem
Existing polycrystalline cubic boron nitride cutting tools are prone to oxidation, diffusion, and chemical wear under high-temperature turning conditions, resulting in reduced lifespan.
Method used
High-melting-point silicides, such as silicon carbide, silicon nitride, silicon boride, or silicon carbonitride, are coated onto the surface of cubic boron nitride. By sintering with a binder and a hard alloy matrix, a composite sheet is formed, isolating oxidizing and corrosive components and reducing element diffusion.
Benefits of technology
It improves the chemical inertness of polycrystalline cubic boron nitride, reduces wear, extends tool life, and enhances resistance to corrosion, oxidation, and diffusion wear.
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Abstract
The application discloses a polycrystalline cubic boron nitride composite sheet and a preparation method thereof, and relates to the technical field of superhard materials. The preparation method of the polycrystalline cubic boron nitride composite sheet comprises the following steps: pretreating cubic boron nitride to obtain cubic boron nitride coated with silicide; the silicide comprises at least one of silicon carbide, silicon nitride, silicon boride and silicon carbonitride; mixing the cubic boron nitride coated with silicide and a binder to obtain a mixture; and performing sintering treatment on the mixture and a hard alloy base body to obtain the polycrystalline cubic boron nitride composite sheet. The preparation method is simple and efficient, and the polycrystalline cubic boron nitride composite sheet prepared by the method has the characteristics of good corrosion resistance, good oxidation wear resistance, good diffusion wear resistance, good chemical wear resistance, good heat resistance and long service life.
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