Preparation method of silicon carbide fiber reinforced silicon carbide composite material

A technology of silicon carbide fiber and composite material, applied in the field of preparation of silicon carbide fiber reinforced silicon carbide composite material, can solve problems such as improvement and stability of unfavorable material properties, high material porosity, unsatisfactory and the like, and achieve cracking quality The effect of high retention rate, improved bonding strength, and shortened preparation cycle

Active Publication Date: 2011-12-14
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ceramic yield of the current ceramic precursors is not satisfactory. A large number of small molecules overflow during the cracking process, resulting in high porosity of the material and easy formation of closed p...

Method used

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  • Preparation method of silicon carbide fiber reinforced silicon carbide composite material
  • Preparation method of silicon carbide fiber reinforced silicon carbide composite material
  • Preparation method of silicon carbide fiber reinforced silicon carbide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of silicon carbide fiber reinforced silicon carbide composite material of the present invention, comprises the following steps:

[0028] (1) Material preparation:

[0029] a. Using SiC fiber as raw material, SiC fiber braided parts are prepared by three-dimensional four-way weaving process;

[0030] b. Prepare Si-H and -CH=CH 2 group of liquid SiC ceramic precursors (LPVCS).

[0031] (2) Deposition of carbon coating: using methane or propylene as the raw material gas, the SiC fiber braided piece is placed in a vacuum furnace for chemical vapor deposition using a differential pressure method, and a carbon coating is deposited on the surface of the SiC fiber braided piece. The process conditions of chemical vapor deposition are: the carbon source is propylene, the flow rate is 0.01m 3 h -1 ; The carrier gas is hydrogen, the flow rate is 0.10m 3 h -1 , the atmosphere pressure is 500Pa; the deposition temperature is 1300°C, and the deposit...

Embodiment 2

[0040] A kind of preparation method of silicon carbide fiber reinforced silicon carbide composite material of the present invention, comprises the following steps:

[0041] (1) Material preparation:

[0042] a. Using SiC fiber as raw material, SiC fiber braided parts are prepared by three-dimensional four-way weaving process;

[0043] b. Prepare Si-H and -CH=CH 2 group of liquid SiC ceramic precursors (LPVCS).

[0044] (2) Deposition of carbon coating: using methane or propylene as the raw material gas, the SiC fiber braided piece is placed in a vacuum furnace for chemical vapor deposition using a differential pressure method, and a carbon coating is deposited on the surface of the SiC fiber braided piece. The process conditions of chemical vapor deposition are: the carbon source is propylene, the flow rate is 0.05m 3 h -1 ;The carrier gas is hydrogen, the flow rate is 0.20m 3 h -1 , the atmosphere pressure is 1500Pa; the deposition temperature is 1200°C, and the deposit...

Embodiment 3

[0053] A kind of preparation method of silicon carbide fiber reinforced silicon carbide composite material of the present invention, comprises the following steps:

[0054] (1) Material preparation:

[0055] a. Using SiC fiber as raw material, SiC fiber braided parts are prepared by three-dimensional four-way weaving process;

[0056] b. Prepare Si-H and -CH=CH 2 group of liquid SiC ceramic precursors (LPVCS).

[0057] (2) Deposition of carbon coating: using methane or propylene as the raw material gas, the SiC fiber braided piece is placed in a vacuum furnace for chemical vapor deposition using a differential pressure method, and a carbon coating is deposited on the surface of the SiC fiber braided piece. The process conditions of chemical vapor deposition are: the carbon source is propylene, the flow rate is 0.10m 3 h -1 ;The carrier gas is hydrogen, the flow rate is 0.15m 3 h -1 , the atmosphere pressure is 200Pa; the deposition temperature is 1400°C, and the depositi...

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Abstract

The invention discloses a preparation method of a silicon carbide fiber reinforced silicon carbide composite material. The preparation method comprises the following steps of preparing a SiC fiber knitted piece, placing the SiC fiber knitted piece into a vacuum furnace to carry out chemical vapor deposition through adopting methane or propylene as feed gas and a pressure difference method to deposit a carbon coating on the surface of the SiC fiber knitted piece, carrying out a vacuum impregnation process on the SiC fiber knitted piece deposited with the carbon coating through adopting a liquid SiC ceramic precursor as impregnation liquid, putting the impregnated SiC fiber knitted piece into a mold, carrying out thermal molding crosslinking in a dynamic nitrogen atmosphere, putting the crosslinked SiC fiber knitted piece into a cracking furnace to carry out high temperature cracking in a dynamic nitrogen atmosphere, repeating a vacuum impregnation-thermal molding crosslinking-high temperature cracking cycle so as to finish preparation until the weight increment of a sample obtained after the vacuum impregnation-thermal molding crosslinking-high temperature cracking cycle is less than 1% of the weight increment of the sample obtained after the previous cycle. The preparation method has the advantages of short period, low cost, low pollution and toxic effects, etc.

Description

technical field [0001] The invention relates to the field of silicon carbide-based composite materials, in particular to a method for preparing a silicon carbide fiber-reinforced silicon carbide composite material. Background technique [0002] With the development of human science and technology, how to further improve the performance of structural materials has gradually become an important breakthrough to accelerate scientific and technological progress. The fatal weakness of SiC ceramic material, such as high brittleness and poor reliability, seriously hinders its practical application as a structural material. Silicon carbide fiber reinforced silicon carbide (SiC f / SiC) composites are prepared by adding SiC fibers to SiC ceramic materials as the second phase, which can absorb energy through mechanisms such as crack deflection, fiber breakage and fiber pull-out during the fracture process, and enhance the strength and toughness of the material. SiC f / SiC composite m...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/622
Inventor 周新贵王军宋永才张长瑞余金山王飞于海蛟王洪磊赵爽罗征黄泽兰
Owner NAT UNIV OF DEFENSE TECH
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