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Hafnium carbide nanowire-toughened ceramic coating layer of surface of carbon/carbon composites and preparation method thereof

A carbon composite material and nanowire toughening technology, which is applied in the field of hafnium carbide nanowire toughening ceramic coating and preparation on the surface of carbon/carbon composite material, can solve the problem that the coating is not dense enough, the toughening effect is limited, and the coating is reduced. Anti-oxidation performance and other issues, to achieve the effect of uniform crystal particle size, reduced cracking tendency, and simple preparation method

Active Publication Date: 2014-07-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology alleviates the cracking tendency of ceramic coatings in the high and low temperature alternating process to a certain extent, the toughening effect of whisker toughened ceramic coatings is not ideal.
Because the whiskers are easy to agglomerate in the coating, the distribution is uneven, so the toughening effect is limited, and the larger whisker size will hinder the diffusion of the outer coating powder, making the coating not dense enough, which greatly reduces the oxidation resistance of the coating.

Method used

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  • Hafnium carbide nanowire-toughened ceramic coating layer of surface of carbon/carbon composites and preparation method thereof
  • Hafnium carbide nanowire-toughened ceramic coating layer of surface of carbon/carbon composites and preparation method thereof
  • Hafnium carbide nanowire-toughened ceramic coating layer of surface of carbon/carbon composites and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] 1) After polishing the C / C composite material with a size of 10mm×10mm×10mm with sandpaper of No. 400, No. 800 and No. 1000 in sequence, it was ultrasonically cleaned with absolute ethanol for 1 hour, and the ultrasonic power was set to 90W. Dry in an oven at °C for later use.

[0045] 2) Configure Ni(NO) with a concentration of 0.2mol / L 3 ) 2 weak. Put the cleaned C / C composite material into the solution and soak for 3 hours, then take it out and dry it in an oven at 80°C for later use.

[0046] 3) Preparation of HfC nanowires by chemical vapor deposition (CVD) process, the specific method is as follows:

[0047] In step 2), the surface is attached with Ni(NO 3 ) 2 The C / C matrix is ​​suspended in the high temperature zone of the vertical resistance furnace, and 50g of HfCl is weighed 4 The powder is placed in a quartz crucible in a low temperature area, the resistance furnace is evacuated to 2kPa, and H 2 As a protective gas, its flow rate is controlled at 1000...

Embodiment 2

[0052] 1) After polishing the C / C composite material with a size of 10mm×10mm×10mm with sandpaper of No. 400, No. 800 and No. 1000 in sequence, it was ultrasonically cleaned with absolute ethanol for 1 hour, and the ultrasonic power was set to 90W. Dry in an oven at °C for later use.

[0053] 2) Configure Ni(NO) with a concentration of 0.5mol / L 3 ) 2 weak. Put the cleaned C / C composite material into the solution and soak for 3 hours, then take it out and dry it in an oven at 80°C for later use.

[0054] 3) Preparation of HfC nanowires by chemical vapor deposition (CVD) process, the specific method is as follows:

[0055] In step 2), the surface is attached with Ni(NO 3 ) 2 The C / C matrix is ​​suspended in the high temperature zone of the vertical resistance furnace, and 50g of HfCl is weighed 4 The powder is placed in a quartz crucible in a low temperature area, the resistance furnace is evacuated to 2kPa, and H 2 As a protective gas, its flow rate is controlled at 2000...

Embodiment 3

[0061] 1) After polishing the C / C composite material with a size of 10mm×10mm×10mm with sandpaper of No. 400, No. 800 and No. 1000 in sequence, it was ultrasonically cleaned with absolute ethanol for 1 hour, and the ultrasonic power was set to 90W. Dry in an oven at °C for later use.

[0062] 2) Configure Ni(NO) with a concentration of 1.0mol / L 3 ) 2 weak. Put the cleaned C / C composite material into the solution and soak for 3 hours, then take it out and dry it in an oven at 80°C for later use.

[0063] 3) Preparation of HfC nanowires by chemical vapor deposition (CVD) process, the specific method is as follows:

[0064] In step 2), the surface is attached with Ni(NO 3 ) 2 The C / C matrix is ​​suspended in the high temperature zone of the vertical resistance furnace, and 50g of HfCl is weighed 4 The powder is placed in a quartz crucible in a low temperature area, the resistance furnace is evacuated to 2kPa, and H 2 As a protective gas, its flow rate is controlled at 3000...

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Abstract

The invention provides a hafnium carbide nanowire-toughened ceramic coating layer of the surface of carbon / carbon composites and a preparation method thereof. The HfC nanowire-toughened SiC ceramic coating layer is prepared by adopting a chemical vapor deposition and embedding two-step method, the toughness of the coating layer can be increased in virtue of nanowire pulling-out, bridging and crack steering mechanisms, and a cracking tendency of the coating layer is decreased. The preparation method has the beneficial effects that the HfC nanowire-toughened SiC ceramic coating layer is prepared by adopting the chemical vapor deposition and embedding two-step method, the toughness of the coating layer can be increased in virtue of the nanowire pulling-out, bridging and crack steering mechanisms, and the ceramic coating layer with a dense structure is prepared. The preparation method of the HfC nanowire-toughened SiC ceramic coating layer is simple, and as seen from figure 2, the HfC nanowire-toughened SiC ceramic coating layer is more dense and complete than an SiC ceramic coating layer, and the crystal particle size in the coating layer is also more uniform.

Description

technical field [0001] The invention belongs to a carbon / carbon composite material surface coating and a preparation method thereof, in particular to a carbon / carbon composite material surface hafnium carbide nanowire toughened ceramic coating and a preparation method. Background technique [0002] C / C composites are currently the only structural materials that can maintain high mechanical properties above 2000 °C, and they have been widely used in aerospace and other defense fields. However, easy oxidation at high temperature is the most difficult bottleneck problem to break through in the practical application of thermal structural C / C composites, and coating technology is an effective means to solve this problem. Among them, the ceramic coating has good oxidation resistance and good physical and chemical compatibility with C / C composites, and is an ideal coating material for C / C composites. However, the brittleness of ceramic coatings is the most difficult bottleneck in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
Inventor 张雨雷任金翠李贺军田松胡志雄
Owner NORTHWESTERN POLYTECHNICAL UNIV
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