CBN Sintered Material With Controlled Voids for Longer Tool Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cubic boron nitride tools experience shortened tool life during high-efficiency processing due to fracture, necessitating a material with improved wear resistance and fracture resistance.
Innovation Solution
A cubic boron nitride sintered material comprising 30-80% cubic boron nitride grains, a specific binder, and controlled void content (0.001-0.20% by volume) to enhance strength, toughness, and thermal expansion coefficient absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cubic boron nitride tools are used for high-efficiency processing, then productivity is improved, but tool life is shortened due to fracture
Solution Approach 1:
The patent optimizes the void content parameter to a specific range (0.03-0.20% by volume) and controls cubic boron nitride grain content (30-80% by volume) to achieve the best balance between toughness and wear resistance, resolving the contradiction between productivity and tool life
Solution Approach 2:
The patent creates a composite sintered material combining cubic boron nitride grains with a specific binder system (group 4-6 elements, aluminum, silicon, iron, cobalt, or nickel, along with their compounds), where the controlled void structure acts as a third component that absorbs thermal expansion differences, achieving synergistic improvement in both toughness and wear resistance
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 material achieves extended tool life during high-efficiency processing by suppressing cracking and enhancing wear resistance and fracture resistance.
Implementation Method 1
the binder has a thermal expansion coefficient within a specific range, thereby enabling the cubic boron nitride sintered material to have a long tool life
Implementation Method 2
a content of a void in the cubic boron nitride sintered material is no less than 0.001% by volume and no more than 0.20% by volume
Data Source
AI summary
A cubic boron nitride sintered material comprising cubic boron nitride grains and a binder, in which a content of the cubic boron nitride grains is no less than 30% by volume and no more than 80% by volume, the binder includes at least one selected from a second group consisting of a material made of a single element selected from a first group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum, silicon, iron, cobalt and nickel, and an alloy and an intermetallic compound each composed of no less than two elements selected from the first group, and a content of a void in the cubic boron nitride sintered material is no less than 0.001% by volume and no more than 0.20% by volume.