Melt siliconizing method for small-size circular-section ceramic-based composite material component

Abstract

The invention relates to a melt siliconizing method for a small-size circular-section ceramic-based composite material component. The invention aims to solve problems that in the LSI process preparation process of a small-size circular-section ceramic matrix composite zero component, the internal and external density gradient difference is likely to be generated, the component density uniformity is poor, deformation is liable to happen, and bottom liquid silicon is liable to be accumulated and bonded. The method mainly comprises the steps of preparing a fused siliconizing tool, machining a small-size circular-section ceramic-based composite material component semi-finished product and preparing the small-size circular-section ceramic-based composite material component; wherein specifically, an inner mold of the small-size circular-section ceramic-based composite material component semi-finished product is filled with SiC sand; meanwhile, powder is packed into a gap, namely a powder filling area, formed between the outer wall of the small-size circular-section ceramic matrix composite component semi-finished product and the inner wall of the first crucible unit. Due to internal andexternal double-sided melt infiltration, the process effectively improves the modification uniformity.

Description

technical field [0001] The invention relates to a method for melting and siliconizing a small-sized circular section ceramic matrix composite material component. Background technique [0002] Ceramic matrix composites have excellent properties such as high temperature resistance, high strength, low density, corrosion resistance and low thermal expansion coefficient, and have become one of the most promising new composite materials for heat-resistant parts and high-strength parts such as aviation and aerospace. During the use of composite materials, the porosity of the material directly determines the various properties of the material, and the key to determining the porosity of the material is the densification technology. The densification processes commonly used in ceramic matrix composites mainly include slurry impregnation-hot pressing sintering method, organic precursor pyrolysis method, chemical vapor infiltration method (CVI method), etc. [0003] Slurry impregnation...

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Problems solved by technology

[0011] In order to solve the problems existing in the LSI process of small-size circular cross-section ceramic matrix composite components, such as easy to produce internal and external density gradient differences, poor component density uniformity, easy deformation, easy accumulation and bonding of liquid silicon at the bottom, etc., the present invention provides a Fused siliconizing method of ceramic matrix composite components with small size and circular cross section

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