Carbon/carbon (C/C) composite material surface low-porosity complex-phase ceramic coating and preparation method thereof

A technology of multiphase ceramics and composite materials, which is applied to the preparation of low-porosity multiphase ceramic coatings on the surface of carbon/carbon composite materials, and the preparation of powders used for ion spraying multiphase ceramic coatings, which can solve the problem of uneven phase distribution. , The problem of high porosity of the composite ceramic coating, to achieve the effect of uniform distribution of the phase and not easy to shrink

Inactive Publication Date: 2016-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a low-porosity composite ceramic coating on the surface of carbon / carbon C / C composite materials and its preparation method, which solves the problems of the composite ceramic coating prepared by the existing supersonic plasma spraying method. Technical problems of high layer porosity and uneven phase distribution

Method used

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  • Carbon/carbon (C/C) composite material surface low-porosity complex-phase ceramic coating and preparation method thereof
  • Carbon/carbon (C/C) composite material surface low-porosity complex-phase ceramic coating and preparation method thereof
  • Carbon/carbon (C/C) composite material surface low-porosity complex-phase ceramic coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028]Step 1: Prepare SiC inner coating. The specific process is:

[0029] 1) The C / C composite material was polished and polished sequentially with No. 400, No. 800 and No. 1000 sandpaper, then ultrasonically cleaned with absolute ethanol, and dried in an oven for later use. The drying temperature is 80°C.

[0030] 2) Weigh 80g of Si powder, 30g of C powder, and 5g of Al respectively 2 o 3 The powder was placed in a turpentine ball mill jar, and agate balls of different numbers and diameters were put into the ball mill jar and mixed for 2 hours to obtain a mixed powder, which was dried and used as an embedding material for later use.

[0031] 3) Put half of the prepared mixed powder into the graphite crucible, then place the cleaned and dried C / C composite material sample on top of the powder, and then put the other half of the embedding powder into the C / C composite material. Specimen coverage.

[0032] Put the above-mentioned graphite crucible into a hot-press vacuum r...

Embodiment 2

[0041] Step 1: Prepare SiC inner coating. The specific process is:

[0042] 1) The C / C composite material was polished and polished sequentially with No. 400, No. 800 and No. 1000 sandpaper, then ultrasonically cleaned with absolute ethanol, and dried in an oven for later use. The drying temperature is 80°C.

[0043] 2) Weigh 80g of Si powder, 30g of C powder, and 5g of Al respectively 2 o 3 The powder was placed in a turpentine ball mill jar, and agate balls of different numbers and diameters were put into the ball mill jar and mixed for 2 hours to obtain a mixed powder, which was dried and used as an embedding material for later use.

[0044] 3) Put half of the prepared mixed powder into the graphite crucible, then place the cleaned and dried C / C composite material sample on top of the powder, and then put the other half of the embedding powder into the C / C composite material. Specimen coverage.

[0045] Put the above-mentioned graphite crucible into a hot-press vacuum ...

Embodiment 3

[0054] Step 1: Prepare SiC inner coating. The specific process is:

[0055] 1) The C / C composite material was polished and polished sequentially with No. 400, No. 800 and No. 1000 sandpaper, then ultrasonically cleaned with absolute ethanol, and dried in an oven for later use. The drying temperature is 80°C.

[0056] 2) Weigh 80g of Si powder, 30g of C powder, and 5g of Al respectively 2 o 3 The powder was placed in a turpentine ball mill jar, and agate balls of different numbers and diameters were put into the ball mill jar and mixed for 2 hours to obtain a mixed powder, which was dried and used as an embedding material for later use.

[0057] 3) Put half of the prepared mixed powder into the graphite crucible, then place the cleaned and dried C / C composite material sample on top of the powder, and then put the other half of the embedding powder into the C / C composite material. Specimen coverage.

[0058] Put the above-mentioned graphite crucible into a hot-press vacuum ...

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Abstract

The invention relates to a carbon/carbon (C/C) composite material surface low-porosity complex-phase ceramic coating and a preparation method thereof. The preparation method comprises the following steps: previously carrying out sintering heat treatment on a ZrB2-SiC powder mixture for ultrasonic plasma spraying in a protective atmosphere, preparing a SiC inner coating and a ZrB2-SiC complex-phase ceramic coating respectively by an embedding process and an ultrasonic plasma spraying two-step process, and carrying out sintering heat treatment on the powder for spraying to sufficiently diffuse molecules so as to form a partial solid solution, thereby preparing the complex-phase ceramic coating with uniform phase distribution and lower porosity. After the ZrB2-SiC powder mixture is subjected to sintering heat treatment in the reducing protective atmosphere, the partial solid solution is formed in the sintering heat treatment process, and the solid solution can not easily shrink in the cooling process, thereby lowering the pores generated in the cooling process after coating spraying and further forming the low-porosity coating. Besides, in the sintering heat treatment process, the molecules interdiffuse, so that the finally prepared complex-phase ceramic coating has more uniform phase distribution.

Description

technical field [0001] The invention relates to a low-porosity composite ceramic coating on the surface of a carbon / carbon C / C composite material and a preparation method thereof, in particular to a low-porosity composite ceramic coating on the surface of a carbon / carbon composite material (hereinafter referred to as C / C composite material). The preparation method of the layer, especially the preparation method of the powder used for supersonic plasma spraying multi-phase ceramic coating. Background technique [0002] C / C composite materials have many excellent properties such as low density, high specific strength, high specific modulus, high temperature resistance, ablation resistance and excellent high temperature mechanical properties. As a thermal structure thermal protection material, it has a wide range of applications in aerospace and other national defense fields. prospect. However, easy oxidation at high temperature is the most difficult bottleneck in the practica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/0054C04B41/009C04B41/52
Inventor 张雨雷胡恒李贺军任金翠费甜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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