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Preparation method for HfC-SiC coating on C/C composite material surface

A composite material and coating technology, which is applied in the preparation field of C/C composite material surface coating, can solve the problems of weak coating binding force and easy cracking of the coating, and achieve the improvement of coating binding force and sample weight loss rate Reduced effect

Active Publication Date: 2016-05-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this study, the chemical vapor phase method was used to prepare multi-layer coatings. The bonding force between the coatings is weak, and the coatings are prone to cracking under high and low temperature alternating thermal cycle conditions.

Method used

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  • Preparation method for HfC-SiC coating on C/C composite material surface
  • Preparation method for HfC-SiC coating on C/C composite material surface
  • Preparation method for HfC-SiC coating on C/C composite material surface

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment is a preparation method of HfC-SiC coating on the surface of a C / C composite material

[0047] Step 1, set the density to 1.7g / cm 3 After the C / C composite material samples were ultrasonically cleaned with distilled water for 25 minutes, they were dried in an oven at 80°C for later use.

[0048] Step 2, ablation treatment to construct the porous layer on the surface; place the C / C sample on the sample stand, and adjust the flow rate of oxygen and acetylene to 0.88m 3 / h and 0.65m 3 / h, ignite after mixing well. Aim the oxyacetylene gun at the C / C sample at an angle of 90° for ablation, the distance between the oxyacetylene gun and the sample is 10mm, and the ablation time is 30s. After ablation, the samples were ultrasonically cleaned with distilled water. Finally, put it into an oven and dry it for later use, and the drying temperature is 80° C., so as to prepare a C / C composite material with a porous surface layer.

[0049] Step 3, introducing HfC...

Embodiment 2

[0057] Step 1, set the density to 1.7g / cm 3 The C / C composite material was ultrasonically cleaned with distilled water for 20 min, and then dried in an oven at 90°C for later use.

[0058] Step 2, ablation treatment to construct the porous layer on the surface; place the C / C sample on the sample table, and adjust the flow rate of oxygen and acetylene to 1.12m 3 / h and 0.83m 3 / h, ignite after mixing well. Aim the oxyacetylene gun at the C / C sample at an angle of 90° for ablation, the distance between the oxyacetylene gun and the sample is 10mm, and the ablation time is 40s. After ablation, the samples were ultrasonically cleaned with distilled water. Finally, put it into an oven and dry it for later use, and the drying temperature is 90° C., so as to prepare a C / C composite material with a porous surface layer.

[0059] Step 3, introducing HfC ceramics on the surface of the C / C composite material by the polymer impregnation cracking method; the specific process is:

[006...

Embodiment 3

[0067] Step 1, set the density to 1.7g / cm 3 The C / C composite material was ultrasonically cleaned with distilled water for 25 minutes, and then dried in an oven at 80°C for later use.

[0068] Step 2, ablation treatment to construct the porous layer on the surface; place the C / C sample on the sample stand, and adjust the flow rate of oxygen and acetylene to 1.51m 3 / h and 1.12m 3 / h, ignite after mixing well. Aim the oxyacetylene gun at the C / C sample at an angle of 90° for ablation, the distance between the oxyacetylene gun and the sample is 10mm, and the ablation time is 35s. After ablation, the samples were ultrasonically cleaned with distilled water. Finally, put it into an oven and dry it for later use, and the drying temperature is 90° C., so as to prepare a C / C composite material with a porous surface layer.

[0069] Step 3, introducing HfC ceramics on the surface of the C / C composite material by the polymer impregnation cracking method; the specific process is:

...

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Abstract

The invention discloses a preparation method for an HfC-SiC coating on a C / C composite material surface. According to the preparation method, the HfC-SiC coating is obtained by performing ablation treatment on a C / C composite material, introducing HfC ceramics, and introducing SiC ceramics through an embedding method. The preparation method comprises the following specific processes: cleaning and drying the C / C composite material for later use; adjusting the flow rate of oxygen and acetylene; fully mixing the oxygen and the acetylene and igniting the mixed gas to perform the ablation treatment on the C / C composite material, and quickly obtaining the C / C composite material with a porous surface layer; introducing the HfC ceramics on the surface of the C / C composite material through a polymer infiltration and pyrolysis method; introducing the SiC ceramics by adopting the embedding method, and finally, preparing the HfC-SiC ceramic coating on the surface of the C / C composite material. Compared with a chemical vapor deposition method, the preparation method has the benefits that the coating bonding force is improved by over 20 percent. Compared with a reactive melt infiltration method, a byproduct is not produced in the preparation process of the coating. Meanwhile, compared with the C / C composite material with a SiC coating under the same process conditions, after 20 times of thermal shock in an oxyacetylene ablation environment from 1,600 DEG C to room temperature, the weight loss ratio of the sample is reduced by 40 to 70 percent.

Description

technical field [0001] The invention belongs to a method for preparing a surface coating of a C / C composite material, in particular to a method for preparing a HfC-SiC coating on the surface of a C / C composite material. Background technique [0002] Carbon / carbon (C / C) composite material is an all-carbon composite material composed of carbon (or graphite) fiber and its fabric as reinforcement, and carbon (or graphite) as matrix. The material has a series of excellent properties, such as high strength, high modulus, low creep, low thermal expansion coefficient, friction resistance, etc. However, the extremely easy oxidation characteristics in high-temperature oxidizing atmospheres greatly limit the application of C / C composites as high-temperature structural materials. Preparation of coatings on the surface of C / C composites is a common means to improve their oxidation resistance at high temperatures. SiC coating has good physical and chemical compatibility with C / C composi...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B41/87
CPCC04B41/009C04B41/52C04B41/89C04B2235/9684C04B35/52C04B41/0072C04B41/4535C04B41/5025C04B41/4545C04B41/5057
Inventor 付前刚张佳平李贺军瞿俊伶
Owner NORTHWESTERN POLYTECHNICAL UNIV
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