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Carbon-fiber reinforced silicon carbide composite material antioxidation coating layer and its preparation method

A technology for composite materials and composite components, which is applied in the field of carbon fiber reinforced silicon carbide composite anti-oxidation coating and its preparation, can solve the problems of no protection effect, poor effect, narrow coating protection temperature range, etc., and achieve good oxidation resistance properties, reducing the rate of oxidation weight loss, and improving the effect of antioxidant protection

Inactive Publication Date: 2006-01-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, under normal circumstances, the overall anti-oxidation coating is used to enhance the anti-oxidation performance of the material. Due to the thermal mismatch between the coating and the substrate, cracks will occur, and the effective protection temperature range of the coating is narrow. When the coating is effective at high temperature, it is effective at low temperature. Very poor, while low temperature is effective, high temperature often has no protective effect

Method used

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  • Carbon-fiber reinforced silicon carbide composite material antioxidation coating layer and its preparation method
  • Carbon-fiber reinforced silicon carbide composite material antioxidation coating layer and its preparation method
  • Carbon-fiber reinforced silicon carbide composite material antioxidation coating layer and its preparation method

Examples

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Effect test

Embodiment 1

[0062] Step 1: Preparation of SiC bonding layer: Rinse the Cf / SiC composite member (50mm×5mm×4mm) prepared by the polymer precursor polycarbosilane (PCS) impregnation cracking process, dry it and bind it with carbon fiber Place in a chemical vapor deposition furnace, raise the temperature of the chemical vapor deposition furnace to 900°C, and then pass H 2 , with H 2 Bring trichloromethylsilane (MTS) into the chemical vapor deposition furnace, feed Ar as the dilution and protective gas, H 2 The flow rate was kept at 500ml / min, the Ar flow rate was kept at 500ml / min, the furnace pressure was kept at 600Pa-800Pa by vacuuming, and the deposition time was 20 hours to prepare the SiC adhesive layer.

[0063] Step 2: Preparation of self-healing layer: Weigh CB 4 、MoSi 2 30 grams each, Y 2 o 3 10 grams of fine powder, mixed and placed in a ball mill jar for ball milling for 2 hours. After ball milling, the mixed powder is mixed with 30 grams of polyvinyl alcohol, and an appropr...

Embodiment 2

[0066] Step 1: Preparation of the SiC bonding layer: raise the temperature of the chemical vapor deposition furnace to 1300°C, and then pass in H 2 , with H 2 Bring trichloromethylsilane (MTS) into a chemical vapor deposition furnace, and pass Ar as a dilution and protection gas. h 2 The flow rate is maintained at 800ml / min, the Ar flow rate is maintained at 400ml / min, and the furnace pressure is controlled at 900Pa-1000Pa by vacuuming. Deposition time 10 hours.

[0067] Step 2 is the same as step 2 of embodiment 1.

[0068] Step 3 is the same as Step 3 in Example 1.

Embodiment 3

[0070] Step 1 is the same as Step 1 in Example 1.

[0071] Step 2: Weigh CB 4 、MoSi 2 20 grams each, Y 2 o 3 10 grams of fine powder, mixed and placed in a ball mill jar for ball milling for 2 hours. After ball milling, the mixed powder is mixed with 20 grams of polyvinyl alcohol, and an appropriate amount of water is added to make a slurry. Apply the slurry on the surface of the Cf / SiC composite member that has prepared the SiC bonding layer, and dry it under the irradiation of infrared lamps. Firing of the self-healing layer: place the sample dried under the infrared irradiation on In a sintering furnace protected by an inert atmosphere at normal pressure, the temperature was raised to 1500°C at a heating rate of 1°C / min, and kept for 30 minutes. After cooling down, a sample containing a self-healing layer with a uniform coating was taken out.

[0072] Step 3 is the same as step 3.

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Abstract

An antioxidizing coated layer of carbon fibre reinforced SiC material is composed of adhesive layer, self-healing layer and impact and corrosion resistant layer. It is prepared through isothermal chemical vapor deposition (CVD) for preparing adhesive layer, coating sludge and sintering for preparing self-healing layer, and isothermal CVD for preparing the impact and corrosion resistant layer.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a carbon fiber reinforced silicon carbide composite anti-oxidation coating and a preparation method thereof. Background technique [0002] The application of Cf / SiC composite materials as high-temperature thermal structural materials in the fields of aviation, aerospace and energy has attracted widespread attention. One of the most ideal thermal structural materials for energy conversion. [0003] Cf / SiC composite material has good high-temperature mechanical properties and thermal properties, and can maintain mechanical properties such as strength without loss in an inert environment exceeding 2000 ° C. It has good fracture toughness and wear resistance, low thermal expansion coefficient, high thermal conductivity, High gasification temperature and good thermal shock resistance. However, in an oxidizing atmosphere, carbon fibers will be oxidized above 400°C, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/80C04B35/622
Inventor 张长瑞周新贵曹英斌邹世钦王思青胡海峰
Owner NAT UNIV OF DEFENSE TECH
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