Ceramic Composite Fabric Impregnation via Ultrasonic Oscillation
Solution Overview
Problem
Ceramic composite materials for jet engine components face issues with low density due to insufficient filling of pores with SiC, leading to defects such as micro-pores and cracks, which are not adequately addressed by existing methods like PIP and slurry immersion.
Innovation Solution
A method involving a mixture of carbon and silicon powders with an organic solvent, ultrasonic oscillation, and calcination to impregnate fibers, forming a ceramic composite material with improved matrix filling and reduced shrinkage, using a polymer ingredient and specific particle sizes to enhance impregnation ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the PIP method is used to form ceramic composite materials, then the ceramic matrix can be formed with fibers, but shrinkage during calcining leads to deterioration of bonding between matrix and fibers and generation of defects such as micro-pores and cracks
Solution Approach 1:
The invention changes the physical and chemical parameters of the impregnating mixture by using a solvent with specific viscosity (0.8-4 mPaS) and incorporating a polymer ingredient, thereby controlling the impregnation process to achieve high impregnation ratio (20-100%) without excessive shrinkage during calcining
Solution Approach 2:
The invention introduces a solvent as an intermediary medium that facilitates the impregnation of carbon and silicon powders into the fiber fabric. The solvent acts as a carrier that enables uniform distribution and penetration of powders into pores, preventing shrinkage-induced defects while maintaining strong bonding between matrix and fibers
2Stability of the object's composition
If the slurry immersion method is used to overcome shrinkage issues, then shrinkage is limited to a small degree, but the obtained ceramic composite materials have relatively low densities because pores among fibers are insufficiently filled by SiC
Solution Approach 1:
The invention optimizes the viscosity parameter of the impregnating mixture (0.8-4 mPaS) to control the penetration depth and distribution of carbon and silicon powders into the fiber fabric pores, achieving both limited shrinkage and high density by adjusting this critical parameter
Solution Approach 2:
The invention applies ultrasonic oscillation to the impregnating mixture during the impregnation process. This mechanical vibration enhances the penetration of powders into pores among fibers, improving the impregnation ratio to 20-100% and filling pores effectively with SiC to increase density while maintaining composition stability
3Ease of manufacture
If carbon and silicon powders are suspended in a solvent to form slurry for fabric impregnation, then the fabric can be impregnated with the mixture, but the impregnation ratio is insufficient to fully fill pores with SiC
Solution Approach 1:
The invention changes the viscosity parameter of the solvent-based impregnating mixture to a specific range (0.8-4 mPaS), which optimizes the flow and penetration characteristics of the mixture into the fabric pores, enabling high impregnation ratio (20-100%) while maintaining ease of manufacture
Solution Approach 2:
The invention introduces ultrasonic oscillation as a mechanical vibration mechanism that significantly enhances the impregnation process. This vibration facilitates the penetration of carbon and silicon powders into pores among fibers, achieving high impregnation ratio and effective pore filling with SiC while keeping the manufacturing process simple
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 achieves higher impregnation ratios and denser ceramic composite materials, reducing defects and improving the structural integrity of jet engine components by effectively filling pores with SiC, suitable for high-temperature applications.
Implementation Method 1
producing an oscillation in the mixture to impregnate the fabric with the mixture
Implementation Method 2
calcining the fabric impregnated with the mixture
Data Source
AI summary
A ceramic composite material is comprised of a fabric of fibers of an inorganic substance; and a matrix for combining the fibers. The matrix consists essentially of a ceramic. The matrix is formed by burying the fabric in a mixture of a powder of carbon, a powder of silicon and a medium including an organic solvent, producing an oscillation in the mixture to impregnate the fabric with the mixture, and calcining the fabric impregnated with the mixture.