Method for covering fiber body
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The chemical vapor infiltration method for covering fiber bodies with ceramics is inefficient due to low film growth rates, leading to prolonged processing times and reduced productivity in producing ceramic matrix composites for high-temperature applications.
Innovation Solution
A method that determines optimal infiltration temperature and pressure conditions to maximize ceramic film growth rates by using a chemical vapor infiltration process, involving a device with controlled temperature and pressure settings, and a model-based approach to calculate ingredient diffusion and reaction rates, ensuring rapid and efficient ceramic impregnation of carbon or SiC fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical vapor infiltration method is used to cover fiber bodies with ceramics, then the ceramic coating can be applied uniformly to the fiber body, but the film growth rate is extremely low and processing time is prolonged
Solution Approach 1:
The invention changes the physical state parameters of the ceramic precursor material from vapor phase to liquid or slurry phase. This parameter change enables much faster impregnation rates compared to the traditional vapor phase method, while still achieving uniform ceramic coating distribution throughout the fiber body structure.
Solution Approach 2:
The invention replaces the chemical vapor infiltration mechanism with a liquid or slurry-based impregnation mechanism. This substitution allows for faster mass transport of ceramic precursors into the fiber body pores, significantly reducing processing time while maintaining coating uniformity through controlled liquid distribution.
2Stability of the object's composition
If chemical vapor infiltration method is used to cover fiber bodies with ceramics, then the ceramic coating can be formed with proper stoichiometry, but the processing time is excessively long
Solution Approach 1:
The invention changes the delivery state of ceramic precursors from vapor to liquid/slurry form, enabling faster impregnation rates. The liquid or slurry carriers can be formulated to contain precise stoichiometric ratios of ceramic components, ensuring proper composition is achieved during the accelerated impregnation process.
Solution Approach 2:
The invention performs preliminary preparation of liquid or slurry ceramic precursor solutions with controlled composition and viscosity before impregnation. This preliminary action ensures that the correct stoichiometric ratios are built into the impregnation medium, allowing rapid impregnation without compromising compositional accuracy.
3Manufacturing precision
If conventional chemical vapor infiltration is used, then the ceramic coating can be applied to the fiber body, but the diffusion of ingredients into fiber bodies is slow
Solution Approach 1:
The invention replaces vapor-phase diffusion with liquid or slurry-phase impregnation. Liquid and slurry phases offer much higher diffusion coefficients and mass transport rates compared to vapor phases, enabling rapid penetration of ceramic precursors deep into the fiber body structure while maintaining uniform distribution.
Solution Approach 2:
The invention utilizes the porous structure of the fiber body to its advantage by employing liquid or slurry impregnation. The liquid carriers can effectively penetrate and fill the porous network of the fiber body, utilizing capillary action and pressure-driven flow to achieve rapid and uniform distribution of ceramic precursors throughout the three-dimensional fiber structure.
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 significantly enhances the film growth rate of ceramics on fiber bodies, reducing processing time and improving the productivity of ceramic matrix composites while maintaining quality and stoichiometric composition.
Implementation Method 1
a reaction from a vapor phase that is superior in diffusion of ingredients for the ceramics is used
Implementation Method 2
chemical vapor infiltration (CVI) method in which a reaction from a vapor phase
Data Source
AI summary
A method for covering a fiber body includes an impregnation condition determination process for, at a time of carrying out a chemical vapor infiltration to cover the fiber body with a ceramic, determining an infiltration temperature and an infiltration pressure that maximizes a film growth rate of the ceramic throughout the fiber body relative to the infiltration temperature; and an infiltration step for supplying a film gas including an ingredient of the ceramic to carry out the chemical vapor infiltration at the infiltration temperature and the infiltration pressure determined in the impregnation condition determination process.