Diamond Sinter Binder Solid Solution Neck Growth
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Solution Overview
Problem
Conventional diamond sintered bodies experience a decrease in strength and wear resistance due to the removal of iron group metals through acid treatment, leading to void formation and insufficient neck growth between diamond particles.
Innovation Solution
A diamond sintered body with a binder containing a solid solution of titanium, zirconium, vanadium, niobium, chromium, carbon, and tungsten, where the diamond particles occupy 80-98% of the volume, and the binder is designed to be discontinuous, facilitating neck growth and maintaining high strength and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If iron group metals are removed through acid treatment to improve wear resistance, then graphitization is restrained, but strength decreases due to void formation
Solution Approach 1:
A solid solution containing Ti, Zr, V, Nb, Cr, C, and W is introduced as an intermediary substance between diamond particles. This solid solution binder performs the dual function of restraining graphitization while maintaining strength, replacing the traditional iron group metal binder that could not simultaneously achieve both objectives.
Solution Approach 2:
The chemical composition and bonding characteristics of the binder are fundamentally changed by using a solid solution containing specific elements (Ti, Zr, V, Nb, Cr, C, W) instead of conventional iron group metals. This parameter change enables the binder to resist graphitization through chemical interaction while maintaining structural integrity and strength.
2Object-affected harmful factors
If iron group metals are removed through acid treatment to improve surface quality, then surface wear resistance improves, but neck growth between diamond particles is insufficient
Solution Approach 1:
The solid solution binder is pre-introduced into the diamond sintered body structure before any potential degradation occurs. This preliminary presence of the solid solution ensures that neck growth between diamond particles is facilitated during the sintering process, creating a strong bonded structure before the material is put into service.
Solution Approach 2:
The solid solution acts as a mediator that promotes neck growth between diamond particles during sintering. The specific composition (Ti, Zr, V, Nb, Cr, C, W) enables effective bonding between diamond particles while restraining subsequent graphitization, thus simultaneously improving both neck growth and surface quality.
3Object-affected harmful factors
If diamond particle content is increased to improve wear resistance, then hardness increases, but binder effectiveness decreases leading to insufficient neck growth
Solution Approach 1:
The chemical composition of the binder is changed to a solid solution containing Ti, Zr, V, Nb, Cr, C, and W, which maintains effectiveness even at low concentrations. This parameter change allows the binder to continue facilitating neck growth between diamond particles even when diamond particle content is high and binder content is low.
Solution Approach 2:
The solid solution binder is strategically positioned in the gaps between diamond particles, where it performs its critical function of facilitating neck growth. The local concentration and distribution of the solid solution are optimized to maximize its effectiveness in promoting bonding between diamond particles while maintaining overall high diamond content for 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 solution results in a diamond sintered body with enhanced strength, wear resistance, and improved durability for use in drawing dies, preventing cleavage and maintaining surface quality of drawn wires with extended tool life.
Implementation Method 1
a binder containing an iron group element, a solid solution containing at least one element selected from a group consisting of titanium, zirconium, vanadium, niobium, and chromium, carbon, and tungsten
Implementation Method 2
an iron group element is removed from the sintered body through an acid treatment
Data Source
AI summary
Provided are a diamond sintered body having higher strength and more excellent wear resistance than a conventional diamond sintered body, and a method for producing such a diamond sintered body. The diamond sintered body includes diamond particles, a binder, and a void. The diamond particles have a content of not less than 80 % by volume but less than 98 % by volume. The binder includes a solid solution containing at least one element selected from a group consisting of titanium, zirconium, vanadium, niobium, and chromium, carbon, and tungsten, as well as an iron group element. Neighboring ones of the diamond particles are bonded to one another. The method provides such a diamond sintered body.