Cubic boron nitride sintered body, method for manufacturing the same, and tool

A cubic boron nitride sintered body with a tailored composition and structure addresses the need for improved fracture and wear resistance in cutting tools, achieving enhanced performance for machining applications.

JP7865474B1Active Publication Date: 2026-05-26RESONAC CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
RESONAC CORP
Filing Date
2025-07-16
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The increasing difficulty in machining workpieces to reduce weight and the rise in cutting speeds have led to stricter performance requirements for cutting tools using cubic boron nitride (cBN) sintered bodies, necessitating improvements in fracture resistance and wear resistance.

Method used

A cubic boron nitride sintered body with a specific composition and structure, including cubic boron nitride and a bonding phase containing Ti carbides, Ti nitrides, Ti carbonitrides, W2B, and W2CoB2, with controlled diffraction peak intensities and porosity, is produced through a method involving binder grinding and sintering.

Benefits of technology

The solution provides a cBN sintered body with enhanced fracture resistance, wear resistance, and thermal conductivity, suitable for cutting and grinding tools.

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Abstract

A cubic boron nitride sintered body having cubic boron nitride and a bonding phase which is the remainder of the cubic boron nitride, wherein the content of the cubic boron nitride is 50.0 to 90.0% by volume, and the bonding phase contains one or more selected from the group consisting of carbides of Ti, nitrides of Ti, carbonitrides of Ti, and borides of Ti, and one or more selected from the group consisting of W2B and W2CoB2. In the X-ray diffraction pattern of the cubic boron nitride sintered body using CuKα rays as a radiation source, the intensity of the diffraction peak attributed to the (111) plane of the cubic boron nitride is I A , the intensity of the diffraction peak attributed to the (211) plane of the W2B is I B , among the intensity of the diffraction peak attributed to the (211) plane and the intensity of the diffraction peak attributed to the (310) plane of the W2CoB2, the intensity of the diffraction peak with the greater intensity is I c . When the ratio [(I A + I B + I C ) / I B of the sum of I C and I A with respect to I A is 0.25 or more, a cubic boron nitride sintered body, a method for producing the same, and a tool are provided.
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