Dense Ceramic-Metal Composites With Reactive Infiltration Shape Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current manufacturing processes for high-temperature ceramic composites are expensive and result in significant shrinkage, making it difficult to produce complex-shaped components with desired dimensions and properties, limiting their use in high-temperature applications.
Innovation Solution
A method involving the formation of a metal preform with pores, infiltration with a multi-element liquid reactant, and a displacement reaction at elevated temperatures to create a dense ceramic-metal composite with desired shape and dimensions, using processes like reactive liquid infiltration to preserve the shape and reduce porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high-pressure hot pressing or hot-isostatic pressing is used to manufacture dense ceramic composites, then density and high-temperature resistance are improved, but manufacturing cost increases and component shrinkage occurs
Solution Approach 1:
The patent changes the manufacturing parameters by using reactive liquid infiltration at elevated temperatures (below conventional hot pressing temperatures) to achieve dense ceramic-metal composites. This alternative parameter set reduces manufacturing cost while maintaining density and high-temperature resistance, resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent creates composite materials through reactive infiltration where a liquid reactant reacts with a porous metal preform to form a ceramic-metal composite. This composite formation mechanism achieves both density and high-temperature resistance through the inherent properties of the ceramic phase while avoiding the need for expensive conventional processing.
2Reliability
If conventional high-pressure hot pressing or hot-isostatic pressing is used to manufacture dense ceramic composites, then density and high-temperature resistance are improved, but component shrinkage increases
Solution Approach 1:
The patent changes the processing parameters to reactive liquid infiltration at elevated temperatures, which prevents the significant shrinkage associated with conventional hot pressing. This parameter change maintains dimensional accuracy while achieving the desired density and high-temperature resistance.
3Ease of manufacture
If reactive liquid infiltration is used to manufacture ceramic-metal composites, then manufacturing cost decreases and complex shapes are preserved, but porosity increases
Solution Approach 1:
The patent applies local quality by controlling the reactive infiltration process to achieve different porosity levels in different regions of the composite. The porous preform structure is preserved in areas where porosity is beneficial, while the reactive infiltration densifies the material in areas requiring strength and high-temperature resistance, thus resolving the contradiction between manufacturing cost and manufacturing precision.
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 method enables the cost-effective production of complex-shaped, high-temperature ceramic-metal composites with enhanced properties such as high melting temperature, stiffness, and resistance to creep, fracture, and thermal cycling, suitable for aerospace and power production systems.
Implementation Method 1
infiltrating the pores in the preform with a multi-element liquid reactant
Implementation Method 2
reacting the metal containing component with the multi-element liquid reactant in a displacement reaction at an elevated temperature
Data Source
AI summary
Dense ceramic-metal composites and components and methods of manufacturing. A method of manufacturing a ceramic-metal composite includes forming a metal containing component into preform having a desired shape and dimensions with pores therein, infiltrating the pores of the preform with a multi-element liquid reactant, and reacting the metal containing component with the multi-element liquid reactant in a displacement reaction at an elevated temperature to form a less porous ceramic-metal composite.