Stress Relieving Layer Brazed Superabrasive Assembly
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Solution Overview
Problem
The thermal oxidation of diamond-containing materials at high temperatures interferes with the brazing process and deteriorates the integrity of the diamond-containing material, leading to ineffective bonding with the substrate in tool manufacturing.
Innovation Solution
A brazed superabrasive assembly is created with a superabrasive layer coupled to a substrate through a stress relieving layer and a first braze layer, where the stress relieving layer has a higher melting temperature than the braze layers, and a refractory metal carbide is formed between the diamond-containing material and the stress relieving layer to enhance bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If diamond-containing material is brazed to substrate at high temperature (700-1200°C), then bonding strength is improved, but thermal oxidation occurs that interferes with brazing and deteriorates diamond integrity
Solution Approach 1:
A stress relieving layer composed of refractory metal carbide (such as tungsten carbide, titanium carbide, or tantalum carbide) is introduced as an intermediary between the diamond-containing material and the braze joint. This intermediate layer prevents direct contact between the diamond surface and the braze metal, thereby avoiding thermal oxidation of the diamond while still enabling effective bonding through the carbide layer that forms during the brazing process.
2Strength
If braze temperature is increased to improve bonding, then bond integrity is improved, but stress and strain from thermal expansion mismatch increase
Solution Approach 1:
The stress relieving layer is designed with specific material properties (refractory metal carbide composition) and controlled thickness (0.1-10 micrometers) to modify the thermal expansion characteristics of the overall structure. This parameter change allows the system to accommodate thermal expansion differences between components, reducing stress and strain while maintaining bond integrity at high brazing temperatures.
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 approach reduces stress and strain caused by thermal expansion mismatch, improving the performance and integrity of the braze joint, and allows for effective bonding of diamond-containing materials to substrates even at high temperatures.
Implementation Method 1
reduces stress and strain caused by thermal expansion mismatch
Implementation Method 2
a refractory metal carbide is formed between the diamond-containing material and the stress relieving layer to enhance bonding
Implementation Method 3
the first layer and the last layer are positioned along opposite sides of a stress relieving layer... heating to a predetermined temperature until the first layer and the last layer of braze alloy reach at least their liquidus temperatures
Data Source
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AI summary
The present disclosure relates to a brazed superabrasive assemblies and method of producing brazed superabrasive assemblies. The brazed superabrasive assemblies may include a plurality of braze alloy layers that are positioned opposite a stress relieving layer. The stress relieving layer may have a solidus temperature that is greater than a solidus temperature of the plurality of braze alloy layers.