Ceramic Material Fabrication via Porous Preform Infiltration
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Solution Overview
Problem
Existing ceramic processing techniques limit the chemistry and microstructure of ceramic materials, restricting the enhancement of densification and thermal conductivity in end-use components like turbine engine components.
Innovation Solution
A method involving infiltration of a mixture containing a preceramic material and a free metal into a porous structure, followed by thermal treatment to convert the preceramic material into a ceramic matrix and mobilize the free metal to fill internal pores, enhancing densification and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ceramic processing techniques (powder processing, sintering, polymer impregnation, melt infiltration) are used, then ceramic components can be manufactured, but the chemistry and microstructure of the ceramic material are limited
Solution Approach 1:
A porous preform structure is prepared in advance with controlled porosity and architecture before infiltration. This preliminary structure enables subsequent infiltration processes to achieve complex chemistries and microstructures that would be difficult to obtain through conventional direct processing methods.
Solution Approach 2:
The invention combines multiple materials (ceramic precursors, fillers, reinforcements, and other components) into a composite mixture that is infiltrated into the porous preform. This composite approach allows for tailored chemistry and microstructure by selecting and combining specific materials with desired properties.
2Manufacturing precision
If conventional processing techniques are used, then ceramic components can be produced, but densification and thermal conductivity are restricted
Solution Approach 1:
The infiltration process uses fluid dynamics (liquid or vapor state) to penetrate the porous preform structure. The mixture is delivered in a fluid state that allows it to flow into and fill the porous network, achieving uniform distribution and high densification. Subsequent thermal treatment consolidates this into the final dense ceramic structure.
Solution Approach 2:
The process utilizes phase transitions of the infiltration mixture (liquid to solid during thermal treatment) and the ceramic precursor (organic to inorganic during pyrolysis). These phase changes enable densification and microstructure development that improve thermal conductivity and mechanical properties.
3Reliability
If conventional processing techniques are used, then ceramic components can be manufactured, but environmental resistance is limited
Solution Approach 1:
The thermal treatment parameters (temperature, atmosphere, duration) are carefully controlled and optimized to achieve complete conversion of the ceramic precursor while incorporating environmental resistance features. The infiltration mixture composition is also tailored with specific ratios of precursors and fillers to enhance resistance to environmental degradation.
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 allows for the creation of ceramic materials with new compositions and microstructures, improving densification and thermal conductivity, and environmental resistance, suitable for high-performance components.
Implementation Method 1
the green body is thermally treated to convert the rigidized preceramic material into a ceramic matrix
Implementation Method 2
The same thermal treatment or a second, further thermal treatment is used to cause the at least one free metal to move into pores of the thermally treated green body
Data Source
Figure 1~4
AI summary
A method for fabricating a ceramic material (30) includes impregnating a porous structure (32) with a mixture that includes a preceramic polymer and a filler. The filler includes at least one free metal (50). The preceramic polymer material is then rigidized to form a green body. The green body is then thermally treated to convert the rigidized preceramic polymer material into a ceramic matrix (34) located within pores (36) of the porous structure (32). The same thermal treatment or a second, further thermal treatment is used to cause the at least one free metal (50) to move to internal porosity (38) defined by the ceramic matrix (34) or pores (36) of the porous structure (32).