Ceramic Material Fabrication With Glazed Surface-Zone Porosity
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Solution Overview
Problem
Existing ceramic processing techniques limit the chemistry and microstructure of ceramic materials, restricting their properties and applications.
Innovation Solution
A method involving the infiltration of a free metal into a porous ceramic structure, followed by thermal treatment to enhance densification and thermal conductivity, using a glass or glass-ceramic glaze material to seal the surface and modify porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional powder processing and sintering techniques are used, then ceramic materials can be fabricated, but the chemistry and microstructure are limited
Solution Approach 1:
The patent applies parameter changes by transforming the chemical composition and microstructural parameters of ceramic materials through controlled reaction processes. The method enables continuous adjustment of chemistry and microstructure by varying processing parameters such as temperature, time, and reactant ratios, thereby achieving diverse ceramic compositions without requiring multiple distinct processing techniques.
Solution Approach 2:
The patent employs composite materials by creating multi-phase ceramic systems that combine different ceramic phases, glass phases, and crystalline structures. This approach allows the material to exhibit tailored properties by integrating multiple components at the microstructural level, expanding the range of achievable chemistry and microstructure beyond what single-phase processing can provide.
2Strength
If densification is increased to improve mechanical properties, then strength improves, but porosity decreases which may affect thermal conductivity
Solution Approach 1:
The patent applies local quality by creating spatial variations in porosity distribution within the ceramic material. The microstructure is engineered to have different porosity levels in different regions - denser zones for mechanical strength and controlled porosity zones for thermal management. This local differentiation allows simultaneous optimization of both strength and thermal conductivity properties.
Solution Approach 2:
The patent utilizes porous materials by intentionally incorporating controlled porosity into the ceramic structure through the reaction process. The resulting material contains a network of pores that can be tuned in size, distribution, and connectivity to enhance thermal conductivity while maintaining mechanical integrity. The porous structure serves as a pathway for heat transfer while the surrounding matrix provides structural support.
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
Enhances the densification and thermal conductivity of ceramic materials, allowing for the creation of new compositions and microstructures suitable for advanced components like turbine engine parts.
Implementation Method 1
A glaze material seals the surface zone within the pores and on the exterior surface of the surface zone as a glaze layer on the ceramic matrix composite
Implementation Method 2
thermal treatment to enhance densification and thermal conductivity
Implementation Method 3
thermal treatment to enhance densification and thermal conductivity
Data Source
AI summary
A ceramic article includes a ceramic matrix composite that has a porous reinforcement structure and a ceramic matrix within pores of the porous reinforcement structure. The ceramic matrix composite includes a surface zone comprised of an exterior surface of the ceramic matrix composite and pores that extend from the exterior surface into the ceramic matrix composite. A glaze material seals the surface zone within the pores of the surface zone and on the exterior surface of the surface zone as an exterior glaze layer on the ceramic matrix composite. The glaze material is a glass or glass-ceramic material. The ceramic matrix composite includes an interior zone under the surface zone, and the interior zone is free of any of the glaze material and has a greater porosity than the surface zone.