Bonded Metal-Ceramic Preforms via Partial Sintering
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Solution Overview
Problem
Conventional methods for bonding advanced materials like metals and ceramics result in weaker bonds due to limited grain boundary migration, visible bond lines, and microstructural discontinuities, leading to reduced mechanical properties and inefficient energy usage.
Innovation Solution
A method involving partial sintering of preforms to 50-90% of their theoretical maximum density, followed by a final sintering process to form bonded articles with reduced defects and no visible interface, using spark plasma sintering or similar techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bonding methods (diffusion welding, explosion welding, hot pressing) are used to join advanced materials, then the bonding process can be completed, but the bond strength is reduced due to limited grain boundary migration and visible bond lines
Solution Approach 1:
The patent applies preliminary action by partially sintering the feed materials to form preforms with controlled porosity (50-90% of theoretical maximum density) before the final bonding process. This pre-sintering creates a more receptive microstructure that facilitates enhanced grain boundary migration during subsequent bonding, eliminating visible bond lines and improving interface quality while maintaining high bond strength
Solution Approach 2:
The patent employs parameter changes by controlling the density of preforms within a specific range (50-90% of theoretical maximum sintering density) and adjusting sintering parameters (temperature, pressure, time) during the bonding process. These parameter optimizations enable sufficient grain boundary migration to eliminate visible interfaces and defects while achieving strong bonds between advanced materials
2Reliability
If post-process heat treatment is applied to achieve grain boundary migration and mitigate discontinuities, then some defects can be reduced, but energy efficiency decreases and geometric distortion and oxidation occur
Solution Approach 1:
The patent applies preliminary action by incorporating the necessary grain boundary migration and defect mitigation directly into the sintering and bonding process itself, rather than requiring separate post-process heat treatment. By controlling preform density and sintering parameters, the process achieves the desired microstructural refinement in one step, eliminating the need for additional energy-consuming post-treatment operations and avoiding associated geometric distortion and oxidation
Solution Approach 2:
The patent maintains continuity of useful action by integrating grain boundary migration and defect reduction into the primary sintering and bonding process. The controlled porosity of preforms and optimized sintering parameters ensure continuous grain boundary migration occurs during bonding, achieving defect mitigation without interrupting the main process or requiring separate energy-intensive post-treatment steps
3Productivity
If conventional bonding methods are used, then bonding can be achieved, but production time increases and energy consumption rises due to multiple processing steps
Solution Approach 1:
The patent applies merging by combining the sintering and bonding operations into a single integrated final sintering process. Preforms are prepared with controlled porosity (50-90% of theoretical maximum density), then directly bonded in one continuous sintering operation without intermediate steps. This consolidation eliminates multiple heating and cooling cycles, significantly reducing production time and energy consumption while maintaining high bond quality
Solution Approach 2:
The patent applies preliminary action by preparing preforms with optimized porosity (50-90% of theoretical maximum sintering density) before bonding. This preliminary preparation ensures that the subsequent single-step sintering and bonding process can proceed efficiently with enhanced grain boundary migration, eliminating the need for multiple processing steps and reducing both production time and energy consumption
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 method produces stronger bonds with improved mechanical properties and reduced production time and energy costs, eliminating visible interfaces and minimizing defects in the bonded articles.
Implementation Method 1
The first preform is bonded to the second preform via a final sintering process to form a bonded article
Data Source
AI summary
A method of forming an article includes partially sintering a first feed material to form a first preform. The first preform exhibits a density percentage of from about 50% to about 90% of a theoretical maximum sintering density of the first preform. The method further includes partially sintering a second feed material to form a second preform. The second preform exhibits a density of from about 50% to about 90% of a theoretical maximum sintering density of the second preform. The first preform is positioned adjacent to the second preform, and the first preform is bonded to the second preform via a final sintering process to form a bonded article. Additional methods and articles are disclosed.