Preparation method of SiC nanowire-toughened SiC ceramic coating on surface of C/C composite

A technology of nanowire toughening and composite materials, which is applied in the field of preparation of SiC nanowire toughened SiC ceramic coatings on the surface of C/C composite materials, can solve the problems of easy cracking of SiC ceramic coatings, and achieve the improvement of anti-oxidation effect, The effect of relieving thermal stress and stabilizing the rate of oxidation weight loss

Inactive Publication Date: 2016-05-04
NANJING INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: the present invention provides a preparation method of SiC nanowire toughened SiC ceramic coating on the surface of C/C

Method used

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  • Preparation method of SiC nanowire-toughened SiC ceramic coating on surface of C/C composite
  • Preparation method of SiC nanowire-toughened SiC ceramic coating on surface of C/C composite
  • Preparation method of SiC nanowire-toughened SiC ceramic coating on surface of C/C composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Set the density to 1.70g / cm 3 C / C composite material processed into 20×10×5mm 3 The samples are polished with No. 800 and No. 1000 sandpaper in turn, washed with distilled water ultrasonically, dried in an oven at 120°C, and immersed in a 10% by mass nickel nitrate aqueous solution until there are no bubbles on the surface of the sample. After the sample was dried in an oven at 80°C, it was used as a deposition substrate.

[0029] A bundle of carbon fibers is used to bundle the soaked C / C composite material and hang it in the deposition area of ​​a vertical chemical vapor deposition furnace. Evacuate the deposition furnace to 1 kPa, keep the vacuum for 30 minutes to confirm that the sealing performance of the deposition furnace is intact, and then ventilate to normal pressure, and this process is repeated three times. Then the deposition furnace was heated at a rate of 10°C / min to 1100°C, and argon protection was passed into the deposition furnace at a flow rate of 200 scc...

Embodiment 2

[0032] Set the density to 1.68g / cm 3 C / C composite material processed into 20×10×5mm 3 The samples are polished with No. 800 and No. 1000 sandpaper in turn, washed with distilled water ultrasonically, dried in an oven at 120 ℃, and immersed in a 5% nickel nitrate aqueous solution by mass until there are no bubbles on the surface of the sample. After the sample was dried in an oven at 80°C, it was used as a deposition substrate.

[0033] A bundle of carbon fibers is used to bundle the soaked C / C composite material and hang it in the deposition area of ​​a vertical chemical vapor deposition furnace. Evacuate the deposition furnace to 1 kPa, keep the vacuum for 30 minutes to confirm that the sealing performance of the deposition furnace is intact, and then ventilate to normal pressure, and this process is repeated three times. Then, the deposition furnace was heated to 1050°C at a rate of 10°C / min, and argon protection was passed into the deposition furnace at a flow rate of 200 scc...

Embodiment 3

[0036] Set the density to 1.75g / cm 3 C / C composite material processed into 20×10×5mm 3 The samples are polished with No. 800 and No. 1000 sandpaper in turn, washed clean with distilled water ultrasonically, dried in an oven at 120°C, and immersed in a 15% nickel nitrate aqueous solution by mass until there are no bubbles on the surface of the sample. After the sample was dried in an oven at 80°C, it was used as a deposition substrate.

[0037] A bundle of carbon fibers is used to bundle the soaked C / C composite material and hang it in the deposition area of ​​a vertical chemical vapor deposition furnace. Evacuate the deposition furnace to 1 kPa, keep the vacuum for 30 minutes to confirm that the sealing performance of the deposition furnace is intact, and then ventilate to normal pressure, and this process is repeated three times. Then the deposition furnace was heated up to 1200°C at a rate of 12°C / min, and argon protection was passed into the deposition furnace at a flow rate o...

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Abstract

The invention discloses a preparation method of a SiC nanowire-toughened SiC ceramic coating on the surface of a C/C composite. The method includes the steps of putting the ground, polished and dried C/C composite in a deposition furnace, introducing carrier gas hydrogen into a bubbling bottle containing methyl trichlorosilane after the furnace is powered on and heated to a preset temperature, bringing a reaction gas source into a hearth for reaction, obtaining SiC nanowires, depositing the SiC coating after the temperature is raised to the preset temperature, conducting cooling after deposition ends, and obtaining the SiC coating. The compact SiC nanowire-toughened SiC ceramic coating of a sandwich structure is prepared in situ through a one-step CVD method, the cracking tendency of the SiC coating is reduced through the toughening effect of the SiC nanowires, and the oxidation resistance is remarkably improved; the weight loss of the C/C composite with the prepared ceramic coating is only 0.48% when the C/C composite is oxidized in static air at the temperature of 1400 DEG C for 420 hours. The technological process is simple and easy to achieve, and the problems that SiC nanowire-toughened SiC ceramic coatings prepared through an existing method are complex in process and not remarkable in effect are solved.

Description

Technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a preparation method of a SiC nanowire toughened SiC ceramic coating on the surface of a C / C composite material. Background technique [0002] Easily oxidized at high temperature is the most difficult bottleneck problem when C / C composites are used as thermal structural materials. At present, domestic and foreign researchers have proposed many solutions. Among them, preparing an anti-oxidation coating on the surface of C / C composites is an effective method. SiC ceramic material has good oxidation resistance and corrosion resistance, high thermal stability, and relatively good physical and chemical compatibility with C / C composite materials. It is an ideal material for C / C composite material oxidation coating. Nevertheless, there is still a certain difference in thermal expansion coefficient between SiC coating and C / C composite (α SiC ≈4.5×10 -6 K -1 , Α C / C ≈...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/5057C04B41/009C04B41/87C04B2235/9684
Inventor 强新发王章忠巴志新章晓波张保森
Owner NANJING INST OF TECH
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