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Method for preparing silicon carbide fiber reinforced silicon carbide composite material

A silicon carbide fiber and composite material technology, which is applied in the field of silicon carbide fiber-reinforced silicon carbide composite material preparation, can solve the problems of long chemical vapor infiltration process preparation cycle, low mechanical properties and oxidation resistance, and affecting the performance of silicon carbide fibers. Meet the requirements of simple equipment, improve the anti-oxidation performance, and improve the surface condition of fibers

Active Publication Date: 2006-07-19
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon carbide fiber reinforced silicon carbide (SiC f / SiC) composite materials, reaction sintering will affect the performance of silicon carbide fibers due to the need to add sintering aids to sinter at high temperature and pressure; there will be excessive free silicon in the material prepared by the melt infiltration process; and chemical vapor infiltration The process preparation cycle is long and the cost is high
In addition, since the performance of the existing domestic silicon carbide fiber is still far behind that of foreign products, SiC prepared by the above method f The mechanical properties and oxidation resistance of / SiC composite materials are relatively low, and there is still room for further improvement and development

Method used

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  • Method for preparing silicon carbide fiber reinforced silicon carbide composite material
  • Method for preparing silicon carbide fiber reinforced silicon carbide composite material
  • Method for preparing silicon carbide fiber reinforced silicon carbide composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Step 1: Silicon carbide fiber coating. Wind the fibers on a flat plate pasted with release paper. During the winding process, attention should be paid to the flatness and tightness of the fibers, and the fiber tension should be appropriate. The panels are then placed in a chemical vapor deposition furnace for deposition. The deposition raw material, namely the precursor, is trichloromethylsilane (MTS), and the deposition temperature is 1000°C; the carrier gas H 2 The flow rate is 100ml / min, the dilution gas flow rate is 200ml / min); deposition pressure: 0.4kPa; deposition time: 4h.

[0044] Step 2: SiC f / SiC composite material preform thermal molding. Mix silicon carbide micropowder, polycarbosilane and xylene in a ratio of 2:4:4 (wt%), put them into a ball mill jar and mill for 18 hours to obtain a viscous slurry, and paint the slurry on the CVD SiC coated Finally wound on the surface of the fiber on the board. After painting, place the sample in the air to dry, ...

Embodiment 2

[0057] Step 1: Silicon carbide fiber coating. The fibers are wound onto a flat sheet pasted with release paper, and the flat sheet is placed in a chemical vapor deposition furnace for deposition. The deposition material is trichloromethylsilane (MTS), and the deposition temperature is 1050°C; the carrier gas H 2 The flow rate is 100ml / min, the dilution gas flow rate is 200ml / min); deposition pressure: 0.4kPa; deposition time: 8h.

[0058] Step 2: SiC f / SiC composite material preform molding. Mix silicon carbide micropowder, polycarbosilane and xylene in a ratio of 2:4:4 (wt%), put them into a ball mill jar and mill for 18 hours to obtain a viscous slurry, and paint the slurry on the CVD SiC coated surface. Finally, it is wound on the surface of the fiber on the board. After brushing the fibers with the slurry, place them in the air for 3 hours to dry, then perform the second brushing, and repeat the brushing 2 times. After painting, place the sample in the air to dry, c...

Embodiment 3

[0062] Step 1: Silicon carbide fiber coating. The fibers are wound onto a flat sheet pasted with release paper, and the flat sheet is placed in a chemical vapor deposition furnace for deposition. Put the plate into a chemical vapor deposition furnace for deposition, the deposition raw material is trichloromethylsilane (MTS), the deposition temperature is 1100 ° C; the carrier gas H 2 The flow rate is 100ml / min, the dilution gas flow rate is 200ml / min); deposition pressure: 0.4kPa; deposition time: 12h.

[0063] Step 2: SiC f / SiC composite material preform molding. Mix silicon carbide micropowder, polycarbosilane, and xylene in a ratio of 3:4:5 (wt%), put them into a ball mill jar and mill for 18 hours to obtain a viscous slurry, and paint the slurry on the CVD SiC-coated Finally wound on the surface of the fiber on the board. After brushing the fibers with the slurry, place them in the air for 3 hours to dry, then perform the second brushing, and repeat the brushing 2 tim...

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Abstract

The disclosed preparation method for SiCf / SiC composite material comprises: selecting Polycarbosilane as predecessor and domestic continual silicon carbide fiber as reinforcement phase; preparing SiC coating on SiC fiber surface; then, preparing SiCf / SiC composite material with predecessor immersion and crack technique; finally, preparing an integral anti-oxidation coating on material surface. This invention needs only simple device and short production period.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a method for preparing a silicon carbide fiber reinforced silicon carbide composite material. Background technique [0002] Silicon carbide fiber reinforced silicon carbide (SiC f / SiC) composite material came into being with the development of modern science and technology, and its appearance has opened up another broad world for the development of modern science and technology itself. Silicon carbide fiber reinforced silicon carbide composite material has high specific strength and specific modulus, good high temperature performance, good dimensional stability, no moisture absorption, no aging, reliable use, excellent fatigue and creep resistance and good thermal conductivity And conductivity and other advantages, it has great application potential in aerospace, automobile engine and nuclear industry. [0003] At present, the preparation methods of ...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/577C04B35/575C04B41/85C04B41/89
Inventor 周新贵张长瑞王军张洪刚李效东刘荣军曹英斌于海蛟
Owner NAT UNIV OF DEFENSE TECH
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