Cubic Boron Nitride Sintered Material With Carbon-Rich Grain Interfaces
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Solution Overview
Problem
The rapid improvement in mechanical parts functionality makes it difficult to cut workpieces, leading to a short life of cutting tools and increased costs, necessitating a more durable cubic boron nitride sintered material.
Innovation Solution
A cubic boron nitride sintered material with a binder phase composed of elements from group 4, 5, and 6 in the periodic table, along with nitrogen, carbon, and oxygen, and a method involving forming organic-substance-attached cubic boron nitride powder and sintering a powder mixture with a specific carbon content distribution at the interface between grains and binder phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional binder phases are used in low-cBN sintered materials, then the material can be produced with lower cBN content, but the binding strength between cBN grains and binder phase is insufficient
Solution Approach 1:
The patent uses carbon as an intermediary substance at the interface between cBN grains and binder phase. This carbon-rich first region acts as a mediator that enhances the bonding between the binder phase and cBN grains, allowing sufficient binder phase content (20-80 vol%) to be maintained while achieving improved binding strength through the interfacial carbon layer.
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
The solution results in a cubic boron nitride sintered material with enhanced binding strength and longer tool life, reducing tool wear and extending cutting tool durability.
Implementation Method 1
forming an organic-substance-attached cubic boron nitride powder by attaching an organic substance to a cubic boron nitride powder
Implementation Method 2
obtaining the cubic boron nitride sintered material by sintering the powder mixture
Data Source
AI summary
A cubic boron nitride sintered material includes: more than or equal to 20 volume % and less than 80 volume % of cubic boron nitride grains; and more than 20 volume % and less than or equal to 80 volume % of a binder phase, and when a carbon content is measured from a cubic boron nitride grain into the binder phase in a direction perpendicular to an interface between the cubic boron nitride grain and the binder phase using TEM-EDX, a first region having a carbon content larger than an average value of a carbon content of the binder phase exists, the interface exists in the first region, and a length of the first region is more than or equal to 0.1 nm and less than or equal to 10 nm.