Rapid preparation method of C/SiC composite material

A composite material and fast technology, which is applied in the field of rapid preparation of C/SiC composite materials, can solve the problems of high cost and low conversion rate of ceramics, and achieve the effects of rapid preparation, high conversion rate of ceramics and high densification efficiency

Active Publication Date: 2020-12-08
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PIP preparation process is limited by the low conversion rate of ceramics, resulting in repeated impregnation-curing-cracking and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Select the needle-punched weaving body, and treat it with CVD coating for 10 hours to obtain the pretreated blank; 2) Take the equal mass of xylene and polycarbosilane in a beaker, raise the temperature to 50°C until they are completely dissolved, and prepare the first precursor; (3 ) Immerse the pretreated billet with the first precursor for 3 hours in a vacuum state at a temperature of 50°C; after that, take out the pretreated billet from the first precursor and keep it at 120°C for 2 hours; finally, put the pretreated billet into the cracking furnace 4) Repeat step 3) 4 times to obtain a C / SiC blank; 5) Select vinyl perhydropolycarbosilane as the second precursor; 6) C / SiC The SiC billet was impregnated with the second precursor for 3h in a vacuum state at a temperature of 50°C; after that, the C / SiC billet was taken out from the second precursor and kept at 120°C for 2h; finally, the C / SiC billet was put into the cracking furnace , heat treatment at 1100° C. for ...

Embodiment 2

[0028] 1) Select the needle-punched weaving body, and treat it with CVD coating for 10 hours to obtain the pretreated blank; (2) Take the equal mass of xylene and polycarbosilane in a beaker, raise the temperature to 50°C until they are completely dissolved, and prepare the first precursor; 3 ) Immerse the pretreated billet with the first precursor for 3 hours in a vacuum state at a temperature of 50°C; after that, take out the pretreated billet from the first precursor and keep it at 120°C for 2 hours; finally, put the pretreated billet into the cracking furnace 4) Repeat step 3) 6 times to obtain a C / SiC blank; 5) Select vinyl perhydropolycarbosilane as the second precursor; 6) C / SiC The SiC blank was impregnated with the second precursor for 3h in a vacuum state at a temperature of 50°C; after that, the C / SiC blank was taken out from the first precursor and kept at 120°C for 2h; finally, the C / SiC blank was put into a cracking furnace , heat treatment at 1100° C. for 1 h in...

Embodiment 3

[0031] 1) Select the needle-punched weaving body and treat it with CVD coating for 10 hours to obtain the pretreated blank; 2) Take xylene and polycarbosilane of equal mass in a beaker, raise the temperature to 50°C until they are completely dissolved, and prepare the first precursor; 3) Immerse the pretreated billet with the first precursor in a vacuum state for 8 hours at a temperature of 50°C; after that, take out the pretreated billet from the first precursor and keep it warm at 120°C for 5 hours; finally, put the pretreated billet into the cracking furnace , under vacuum, heat treatment at 1200°C for 2 hours; 4) Repeat the 3) step 6 times to obtain a C / SiC blank; 5) Select vinyl perhydropolycarbosilane as the second precursor; 6) C / SiC The blank was impregnated with the second precursor for 8 hours at a temperature of 50°C in a vacuum state; after that, the C / SiC blank was taken out from the second precursor and kept at 120°C for 3 hours; finally, the C / SiC blank was put i...

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PUM

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Abstract

The invention discloses a rapid preparation method of a C / SiC composite material. The method comprises the following steps: carrying out CVD (Chemical Vapor Deposition) coating treatment on a needledwoven body to obtain a pretreated blank; preparing a first precursor, impregnating the pretreated blank with the first precursor, carrying out heat preservation and cracking, and repeating for multiple times to obtain a C / SiC blank; and selecting vinyl-containing perhydropolycarbosilane as a second precursor, impregnating the C / SiC blank, carrying out thermal cracking, and repeating the steps several times to obtain the C / SiC composite material. By controlling the use of precursors with different properties, the high-performance and rapid preparation process of the composite material is realized. The first precursor ensures moderate interface bonding of the composite material and ensures the final mechanical properties of the composite material; the conversion rate of the vinyl-containingperhydropolycarbosilane ceramic is high, and the purpose of rapid densification of the composite material is guaranteed; the preparation period of the C / SiC composite material prepared by the preparation method disclosed by the invention can be shortened by one third, and the bending strength can still be kept at about 90% of the original bending strength.

Description

technical field [0001] The invention belongs to the technical field of C / SiC composite material preparation, and in particular relates to a rapid preparation method of C / SiC composite material. Background technique [0002] C / SiC composite materials have excellent performance, heat resistance, wear resistance, and high strength. They are mostly used in military fields such as aerospace and aviation. The material is beyond reach. [0003] The precursor conversion method (PIP) is based on dissolving polycarbosilane, impregnating it into the fiber gap under the action of vacuum, after curing, and then converting it into SiC matrix through high temperature cracking. The PIP preparation process is limited by the low conversion rate of the ceramic, resulting in repeated impregnation-curing-cracking and high cost. Contents of the invention [0004] The purpose of the present invention is to provide a low-cost C / SiC composite rapid preparation method for the defects of the prior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/589C04B35/622
CPCC04B35/589C04B35/622C04B2235/6581C04B2235/6567C04B2235/96
Inventor 高银东陈海昆佘平江李艳阳
Owner 湖北三江航天江北机械工程有限公司
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