Coated Boron Nitride Insert for Wear-Resistant Cutting
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Solution Overview
Problem
Existing boron nitride sintered body inserts for crushing members and tools face challenges in achieving optimal wear resistance and performance as cutting tools.
Innovation Solution
The insert is made from a boron nitride sintered body containing cubic and compressed boron nitride, with specific X-ray diffraction intensity ratios indicating oriented crystal planes, and a coating layer is applied to enhance wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cubic boron nitride with strong (111) plane orientation is used as raw material, then hardness is improved, but wear resistance is insufficient
Solution Approach 1:
The invention uses a composite sintered body containing both cubic boron nitride and compressed boron nitride. The cubic boron nitride provides hardness through strong (111) plane orientation, while the compressed boron nitride with oriented (002) planes provides wear resistance. This composite structure resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The invention creates different local orientations within the sintered body: cubic boron nitride with (111) planes oriented in the vertical direction for hardness, and compressed boron nitride with (002) planes oriented in the vertical direction for wear resistance. Each component has locally optimized crystallographic orientation to fulfill its specific function.
2Reliability
If hexagonal boron nitride is used, then wear resistance is improved, but cutting tool performance deteriorates
Solution Approach 1:
The invention combines compressed boron nitride (which has wear resistance similar to hexagonal boron nitride) with cubic boron nitride (which provides superior cutting performance). This composite approach allows the insert to achieve both wear resistance and cutting tool performance, avoiding the limitation of using pure hexagonal boron nitride.
3Reliability
If coating layer is added to enhance wear resistance, then durability is improved, but device complexity increases
Solution Approach 1:
The invention achieves wear resistance through the compressed boron nitride component within the sintered body itself, which has oriented (002) planes providing inherent wear resistance. The coating layer serves as an additional protective layer, but the primary wear resistance comes from the composite material structure, reducing the complexity burden of the coating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly improves wear resistance and extends the life of the insert by optimizing the orientation of boron nitride planes and utilizing a coating layer for enhanced durability.
Implementation Method 1
In a transmission X-ray diffraction of a cross section of the boron nitride sintered body perpendicular to the first surface, an X-ray intensity at a top of a 111 diffraction peak of the cubic boron nitride is denoted as IcBN(111)v
Data Source
AI summary
A transmission X-ray diffraction on a cross section of a boron nitride sintered body perpendicular to a first surface provides X-ray intensities at a top of a 111 diffraction peak of cubic boron nitride and X-ray intensities at a top of a 002 diffraction peak of compressed boron nitride, in a direction perpendicular to the first surface and a direction parallel to the first surface. A compressed boron nitride content value obtained from these X-ray intensities is greater than 0.002 and smaller than 0.01. A cubic orientation value is greater than 0.5, and a compressed boron nitride orientation value is greater than the cubic orientation value. An insert has a coating layer on at least a part of a surface of the boron nitride sintered body.