Method for preparing SiC (silicon carbide) coating with fine grains on surface of C/C (carbon/carbon) composite

A carbon composite material and silicon carbide coating technology, which is applied in the field of coating preparation, can solve the problems of poor oxidation resistance and large grain size

Active Publication Date: 2016-11-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing a silicon carbide coating with fine grains on the surface of a carbon / carbon composite material, which solves the problem of large grain size and low oxidation resistance of the existing silicon carbide coating technology. bad defect

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  • Method for preparing SiC (silicon carbide) coating with fine grains on surface of C/C (carbon/carbon) composite
  • Method for preparing SiC (silicon carbide) coating with fine grains on surface of C/C (carbon/carbon) composite
  • Method for preparing SiC (silicon carbide) coating with fine grains on surface of C/C (carbon/carbon) composite

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Effect test

Embodiment 1

[0025] Step 1: Atomic oxygen oxidation treatment of C / C composite materials, the specific process is:

[0026] 1) The density is 1.68g / cm 3 The 2D C / C composite material was polished with No. 400, No. 600 and No. 1000 sandpaper, and then ultrasonically cleaned with water and absolute ethanol for 20 min, respectively, and dried in a drying oven at 80 °C for 24 h.

[0027] 2) Atomic oxygen oxidation C / C composite material: put the dried C / C composite material into the coaxial atomic oxygen ground simulation test device, the atomic oxygen energy is 5-8eV, and the flux density is 1.0×10 14 -1.0×10 16 atom / (cm 2 ·s), atomic oxygen oxidation treatment for 3h.

[0028] Step 2: Prepare SiC coating, the specific process is:

[0029] 1) Preparation of silicon carbide coating: the mixed powder of silicon, carbon and alumina is prepared according to mass percentage: silicon, 70%; carbon, 25%; alumina, 5%. Mix the powder and place it in a turpentine ball mill jar, put agate balls of d...

Embodiment 2

[0033] Step 1: Atomic oxygen oxidation treatment of C / C composite materials, the specific process is:

[0034] 1) The density is 1.73g / cm 3 The 2D C / C composite material was chamfered with No. 400, No. 600 and No. 1000 sandpaper, and anhydrous ethanol was used as a solution, ultrasonically cleaned for 20 minutes, and dried in an 80°C drying oven for 24 hours.

[0035] 2) Atomic oxygen oxidation C / C composite material: put the dried C / C composite material into the coaxial source atomic oxygen ground simulation test device, the energy of atomic oxygen is 5-8eV, and the flux density is 1.0×10 14 -1.0×10 16 atom / (cm 2 ·s), atomic oxygen oxidation treatment for 6h.

[0036] Step 2: Prepare SiC coating, the specific process is:

[0037] 1) Preparation of silicon carbide coating: the mixed powder of silicon, carbon and alumina is according to the mass percentage: silicon, 73%; carbon, 15%; alumina, 12%; put the powder into a rosin ball mill after mixing In the process, put differe...

Embodiment 3

[0041] Step 1: Atomic oxygen oxidation treatment of C / C composite materials, the specific process is:

[0042] 1) Set the density to 1.8g / cm 3 The 2D C / C composite material was polished with No. 400, No. 600 and No. 1000 sandpaper, and then ultrasonically cleaned with water and absolute ethanol for 20 min, respectively, and dried in a drying oven at 80 °C for 24 h.

[0043] 2) Atomic oxygen oxidation C / C composite material: put the dried C / C composite material into the coaxial source atomic oxygen ground simulation test device, the energy of atomic oxygen is 5-8eV, and the flux density is 1.0×10 14 -1.0×10 16 atom / (cm 2 ·s), atomic oxygen oxidation treatment for 9h.

[0044] Step 2: Prepare SiC coating, the specific process is:

[0045] 1) Preparation of silicon carbide coating: the mixed powder of silicon, carbon and aluminum oxide is according to the mass percentage: silicon, 83%; carbon, 12%; aluminum oxide: 5%; put the powder into a rosin ball mill tank after mixing I...

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Abstract

The invention relates to a method for preparing a SiC (silicon carbide) coating with fine grains on the surface of a C/C (carbon/carbon) composite. The C/C composite which is polished, washed and dried is subjected to atomic oxygen oxidation treatment, the surface of the C/C composite subjected to atomic oxygen oxidation treatment is fluffy, the fluffy surface can provide a large quantity of nucleation points, nucleation of the SiC coating is facilitated, and a more uniform and compact coating can be formed on the surface of the C/C composite. The SiC coating is prepared on the surface of the C/C composite subjected to atomic oxygen oxidation treatment in a vacuum furnace under the protection of argon with an embedding method, the size of the grains of the prepared SiC coating ranges from 1 mu m to 5 mu m, and the size of grains of a SiC coating prepared with a traditional embedding method is about 20-100 mu m. After a sample which is not subjected to atomic oxygen oxidation treatment is oxidized, a large quantity of pores and cracks occur on the surface and the size of the pores is about 20-500 mu m; however, after a sample subjected to atomic oxygen oxidation treatment is oxidized, a few pores are formed in the surface, the size of the pores is about 20-110 mu m, and the glassy state formed on the surface is relatively continuous and can effectively protect the C/C composite.

Description

technical field [0001] The invention belongs to a method for preparing a coating, in particular to a method for preparing a silicon carbide coating with fine crystal grains on the surface of a carbon / carbon composite material. Background technique [0002] Carbon / carbon composite materials have the characteristics of low density, high specific strength, high specific modulus, ablation resistance, corrosion resistance, low thermal expansion coefficient, stable friction coefficient, and good thermal and electrical conductivity. In particular, its strength does not decrease but increases with the increase of temperature at high temperatures, making it the only high-temperature structural composite material that can be used above 2000 ° C. When used as a thermal protection system material for aerospace vehicles, it has other advantages. Incomparable advantages of materials. But there is an important disadvantage of C / C composites: many of its excellent properties can only be ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5059C04B41/87C04B35/83C04B41/4545C04B41/455C04B41/4517
Inventor 郭领军霍彩霞李贺军黎云玉刘跃沈庆凉寇钢
Owner NORTHWESTERN POLYTECHNICAL UNIV
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