Preparation of sic fiber by mixing ultra-high temperature ceramic composite material and its method and application

A technology of ultra-high temperature ceramics and composite materials, applied in the direction of inorganic raw material rayon, etc., can solve the problems of poor bending and shearing resistance, prone to cracks, carbon-rich, etc. High temperature performance, the effect of improving the degree of densification

Active Publication Date: 2022-01-04
JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, SiC fiber has been widely used in the field of aerospace, but there are many shortcomings in SiC fiber at this stage. SiC fiber has high oxygen content, rich carbon, poor mechanical properties, poor bending and shear resistance, easy to crack, and lower temperature. , the volume shrinkage is large, the internal structure has more pores, the density is small, and the high temperature stability is poor.

Method used

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  • Preparation of sic fiber by mixing ultra-high temperature ceramic composite material and its method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 proposes a method for preparing SiC fibers by adding ultra-high temperature ceramic composite materials, including the following steps:

[0020] (1) First add glycerol and trimethylmonochlorosilane dropwise in dimethyldichlorosilane with stirring, then add reaction metal and xylene, then heat to 100°C to melt the reaction metal into a liquid state and stir When the solution turns purple, reduce the temperature to room temperature until the purple is no longer deep, then cool and filter, wash with alcohol for 3 times, dry and grind into powder; among them, dimethyldichlorosilane, glycerol and trimethyl The volume ratio of monochlorosilane is 10:2:1; the reaction metal is potassium or magnesium, the reaction metal accounts for 13% of the mass of the reactant, and xylene accounts for 5% of the total volume of the reactant.

[0021] (2) Polydimethylsilane, polymer organo-zirconane, polymer organoboroaluminum-zircone and polycarbosilane are mixed according to th...

Embodiment 2

[0024] Embodiment 2 proposes a method for preparing SiC fibers by adding ultra-high temperature ceramic composite materials, including the following steps:

[0025] (1) First add glycerol and trimethylmonochlorosilane dropwise in dimethyldichlorosilane with stirring, then add reaction metal and xylene, then heat to 150°C to melt the reaction metal into a liquid state and stir When the solution turns purple, reduce the temperature to room temperature until the purple is no longer deep, then cool and filter, wash with alcohol for 3 times, dry and grind into powder; among them, dimethyldichlorosilane, glycerol and trimethyl The volume ratio of monochlorosilane is 10:2:1; the reaction metal is potassium or magnesium, the reaction metal accounts for 7% of the mass of the reactant, and xylene accounts for 8% of the total volume of the reactant.

[0026] (2) Polydimethylsilane, polymer organo-zirconane, polymer organoboroaluminum-zircone and polycarbosilane are mixed according to the...

Embodiment 3

[0029] Embodiment 3 proposes a method for preparing SiC fibers by adding ultra-high temperature ceramic composite materials, including the following steps:

[0030] (1) First add glycerol and trimethylmonochlorosilane dropwise in dimethyldichlorosilane with stirring, then add reaction metal and xylene, then heat to 125°C to melt the reaction metal into a liquid state and stir When the solution turns purple, reduce the temperature to room temperature until the purple is no longer deep, then cool and filter, wash with alcohol for 3 times, dry and grind into powder; among them, dimethyldichlorosilane, glycerol and trimethyl The volume ratio of monochlorosilane is 10:2:1; the reaction metal is potassium or magnesium, the reaction metal accounts for 10% of the mass of the reactant, and xylene accounts for 6% of the total volume of the reactant.

[0031] (2) Polydimethylsilane, polymer organo-zirconane, polymer organoboroaluminum-zircone and polycarbosilane are mixed according to th...

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Abstract

The present invention relates to a SiC fiber mixed with ultra-high temperature ceramic composite material and its preparation method and application. and xylene, heated until the metal melts into liquid and stirred until purple, then cooled, filtered, dried and ground into powder; Mixing and heating to obtain a crude polycarbosilane product mixed with an ultra-high temperature ceramic composite material, and refining it; mixing the powder with the refined polycarbosilane product and weaving to obtain a method for preparing SiC fibers mixed with an ultra-high temperature ceramic composite material. The SiC fiber prepared by mixing ultra-high temperature ceramic composite material prepared by the present invention is mixed with nano-aluminum in the SiC fiber, so that it is evenly dispersed in the structure of the SiC fiber, and the ductility, tensile performance, and bending resistance of SiC are increased. crack performance.

Description

technical field [0001] The invention relates to a preparation method and application of SiC fiber mixed with ultra-high temperature ceramic composite material. Background technique [0002] In recent years, SiC fiber has been widely used in the field of aerospace, but there are many shortcomings in SiC fiber at this stage. SiC fiber has high oxygen content, rich carbon, poor mechanical properties, poor bending and shear resistance, easy to crack, and lower temperature. , the volume shrinkage is large, the internal structure has more pores, the density is small, and the high temperature stability is poor. Therefore, blending other high-performance materials on the basis of existing SiC fibers to improve the performance of SiC fibers is the main trend of SiC fiber development at this stage. Contents of the invention [0003] An object of the present invention is to propose a method for preparing SiC fiber material with high heat resistance and ductility. [0004] The metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C04B35/571C04B35/622
CPCD01F9/08C04B35/62281C04B2235/48C04B2235/483C04B2235/486
Inventor 吴宝林侯振华
Owner JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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