Method for preparing carbon/carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating

A technology of c-alpo4-sicn and carbon composite materials, which is applied in the field of preparing carbon/carbon composite composite outer coatings, can solve the problems of easy cracking of the outer coating surface, inability to complete the preparation at one time, and insufficient coating thickness, etc., to achieve Good anti-oxidation performance, short preparation cycle, complete and sufficient effect

Active Publication Date: 2013-04-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The use of supercritical fluid technology to prepare C/C composite coatings requires high temperature and high pressure for the preparation process, which requires high equipment requirements, and the formed outer coating should be heat treated in an inert atmosphere, and the preparation cycle Relatively long [Bemeburg P L, Krukonis V J.Processing of carbon/carbon composites using supercritical fluid technology[P].United States Patent US5035921,1991], the coating prepared by the in-situ forming method needs to be treated at a high temperature of 1500°C, and Can not be prepared at one time [Huang Jian-Feng, Li He-Jun, Zeng Xie-Rong, Li Ke-Zhi.Surf.coat.Technol.2006,200,5379.], the outer coating prepared by sol-gel method The surface is easy to crack and the coating thickness is insufficient [Huang Jian-Feng, Zeng Xie-Rong, Li He-Jun, Xiong Xin-Bo, Sun Guo-ling.Surf.coat.Technol.2005,190,255.], while using The preparation of the coati

Method used

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  • Method for preparing carbon/carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 2) Take 1.0g of Y 2 Si 2 o 7 Whiskers, 2.0g of C-AlPO 4 Add 1.0g of nano-silicon carbide into the conical flask, then pour 300ml of isopropanol into the conical flask to obtain a suspension, then put the suspension into a 300W ultrasonic generator and vibrate for 80min, take it out and put it in Magnetic rotor, placed on a magnetic stirrer and stirred for 12 hours to obtain suspension A;

[0021] 3) Add 0.1g tellurium simple substance to the suspension A, put it into a 300W ultrasonic generator and shake it for 80min, take it out and stir it on a magnetic stirrer for 12h to get solution B;

[0022] 4) Pour solution B into the hydrothermal reaction kettle, and the filling degree is controlled at 68%; then the carbon / carbon composite material sample with SiC inner coating is clamped on the cathode clamp in the hydrothermal kettle, with graphite as the Anode, put the hydrothermal kettle into the coil of the electromagnetic induction heater; then connect the positive an...

Embodiment 2

[0025] 2) Take 8.0g of Y 2 Si 2 o 7 Whiskers, 5.0 g of C-AlPO 4 and 5.0g of nano-silicon carbide into the conical flask, then pour 500ml of isopropanol into the conical flask to obtain a suspension, then put the suspension into a 500W ultrasonic generator and vibrate for 60min, take it out and put it in Magnetic rotor, placed on a magnetic stirrer and stirred for 24 hours to obtain suspension A;

[0026] 3) Add 1.0g tellurium elemental substance to the suspension A, put it into a 500W ultrasonic generator and shake it for 60min, take it out and stir it on a magnetic stirrer for 24h to get solution B;

[0027] 4) Pour solution B into the hydrothermal reaction kettle, and the filling degree is controlled at 65%; then the carbon / carbon composite material sample with SiC inner coating is clamped on the cathode clamp in the hydrothermal kettle, with graphite as the Anode, put the hydrothermal kettle into the coil of the electromagnetic induction heater; then connect the positiv...

Embodiment 3

[0030] 2) Take 5.0g of Y 2 Si 2 o 7 Whiskers, 3.0 g of C-AlPO 4 and 3.0g of nano-silicon carbide were added to the conical flask, and then 400ml of isopropanol was poured into the conical flask to obtain a suspension, and then the suspension was placed in an 800W ultrasonic generator to vibrate for 50min, and then put into Magnetic rotor, placed on a magnetic stirrer and stirred for 36h to obtain suspension A;

[0031] 3) Add 0.5g tellurium elemental substance to the suspension A, put it into an 800W ultrasonic generator and shake for 50min, take it out and stir it on a magnetic stirrer for 36h to get solution B;

[0032] 4) Pour solution B into the hydrothermal reaction kettle, and the filling degree is controlled at 67%; then the carbon / carbon composite material sample with SiC inner coating is clamped on the cathode clamp in the hydrothermal kettle, with graphite as the Anode, put the hydrothermal kettle into the coil of the electromagnetic induction heater; then connec...

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Abstract

The invention relates to a method for preparing a carbon/carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating. An induction heating auxiliary impulse arc discharge deposition method is adopted for preparing the carbon/carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating which has a uniform surface free from microcracks, is uniform in thickness, has no penetrable holes or cracks, and is higher in binding force and good in oxidation resistance. As suspended charge particles have high energy and are high in diffusion migration rate under the condition of induction heating, the reaction is accomplished in a water heat kettle at one time, and pulsed arc discharge sintering is accompanied; the coating is dense and uniform, has a higher interface binding force, and is not required to be subjected to post heat treatment; the preparation cost is low; and the method is simple to operate and short in preparation cycle. In addition, the electromagnetic induction heating can allow local high temperature and high pressure to be generated in a reaction system rapidly, so that the reaction activation energy of yttrium silicate whiskers, and C-AlPO4 and SiCn suspended particles is reduced effectively, the yttrium silicate whiskers, and C-AlPO4 and SiCn suspended particles can react more completely and sufficiently during the pulsed arc discharge deposition process; and the coating with a dense structure is obtained.

Description

technical field [0001] The invention relates to a method for preparing a carbon / carbon composite material composite outer coating, in particular to a method for preparing a carbon / carbon composite material yttrium silicate whisker reinforced C-AlPO 4 -SiC n Method of composite topcoat. Background technique [0002] C / C composite material is also called carbon fiber carbon-based composite material. Because it is only composed of a single carbon element, it not only has the advantages of excellent ablation resistance, low density and low thermal expansion coefficient of carbon and graphite materials, but also has the advantages of high temperature resistance. Has excellent mechanical properties. In particular, its strength does not decrease but increases with the increase of temperature, making it one of the promising high-tech new materials, and is widely used as ablation materials and thermal structural materials in the field of aviation and aerospace technology. However,...

Claims

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Application Information

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IPC IPC(8): C04B41/89
Inventor 黄剑锋郝巍曹丽云费杰殷立雄王开通
Owner SHAANXI UNIV OF SCI & TECH
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