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Preparation method of zirconium and/or tungsten-based multiphase ceramic coating

A composite ceramic and tungsten-based technology, applied in the field of composite materials, can solve the problems of poor density, low bonding strength between coating and substrate, uneven distribution of coating surface, etc., and achieve good ablation performance

Active Publication Date: 2021-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, the metal coating obtained by the diamond salt bath plating method is relatively thin; the bonding strength between the coating and the substrate obtained by other methods is low, the coating surface is unevenly distributed, and the density is poor

Method used

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  • Preparation method of zirconium and/or tungsten-based multiphase ceramic coating
  • Preparation method of zirconium and/or tungsten-based multiphase ceramic coating
  • Preparation method of zirconium and/or tungsten-based multiphase ceramic coating

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preparation example Construction

[0051] The invention provides a method for preparing a zirconium and / or tungsten-based multiphase ceramic coating, which uses a molten salt method to prepare a tungsten or zirconium ceramic coating, comprising:

[0052] mixing the chloride salt and the metal powder to obtain a mixed powder; the metal powder includes tungsten powder and / or zirconium powder;

[0053] Degreasing and activating the carbon-carbon matrix to obtain an activated carbon-carbon matrix;

[0054] The activated carbon-carbon matrix is ​​subjected to a salt bath in the mixed powder to obtain a zirconium and / or tungsten-based multiphase ceramic coating.

[0055] In the present invention, the chloride salt is preferably selected from two or more of sodium chloride, potassium chloride and barium chloride; the purity of the chloride salt is preferably 99.4 to 99.6%, more preferably 99.5% .

[0056] In the present invention, the metal powder is preferably tungsten powder or zirconium powder. In the present in...

Embodiment 1

[0093] Mix sodium chloride, barium chloride, and tungsten powder according to the mass ratio of 1:1:1, add them to the ball mill tank, use absolute ethanol ball mill to wet mix for 24 h, and the mixed powder mixed by ball milling is placed in a vacuum at 50°C. Dry in a drying oven, and the mixed powder passes through a 150-mesh sieve several times to fully mix the metal powder and the chloride salt.

[0094] The carbon / carbon matrix (M30 model product provided by Changsha Jieshun New Material Co., Ltd.) has a density of 1.75g / cm 3 , some oil stains remain on the surface of the substrate during processing, and 10g / L Na 2 CO 3 The solution was soaked in a water bath at 80°C for 20 min to remove oil stains, and then ultrasonically cleaned with deionized water to remove residual Na on the surface. 2 CO 3 , and finally place the substrate in a nitric acid solution with a mass concentration of 60% in a water bath at 80°C for surface activation treatment. After the activation trea...

Embodiment 2

[0101] Mix sodium chloride, barium chloride, and zirconium powder according to the mass ratio of 1:1:1, add them to the ball mill tank, use absolute ethanol ball mill to wet mix for 24 h, and the mixed powder mixed by ball milling is placed in a vacuum at 50 ° C. Dry in a drying oven, and the mixed powder passes through a 150-mesh sieve several times to fully mix the metal powder and the chloride salt.

[0102] Modified C / C matrix (provided by Hunan Boyun New Material Co., Ltd.) has a density of 2.55 g / cm 3 , some oil stains remain on the surface of the substrate during processing, and 15 g / L Na 2 CO 3 The solution was soaked in a water bath at 80°C for 20 min to remove oil stains, and then ultrasonically cleaned with deionized water to remove residual Na on the surface. 2 CO 3 , and finally place the substrate in a nitric acid solution with a mass concentration of 60% in a water bath at 80°C for surface activation treatment, and the carbon-carbon substrate after the activa...

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Abstract

The invention provides a preparation method of a tungsten and / or zirconium-based multiphase ceramic coating, which comprises the following steps: adding a mixture of a carbon-carbon matrix and chlorine salt metal powder into a graphite crucible, dissolving and flowing molten salt in a high-temperature argon atmosphere, and carrying out salt bath on the surface of the carbon-carbon matrix to prepare the ceramic coating. According to the preparation method provided by the invention, the carrier effect of a molten salt liquid phase at the temperature of 1300-1700 DEG C is ingeniously utilized, and the ceramic multiphase coating with high density is deposited on the surface of the carbon-based material. The method provided by the invention is short in production period, simple in process and cost-saving.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a zirconium and / or tungsten-based multiphase ceramic coating. Background technique [0002] C / C composite material is a high-temperature structural material with carbon fiber as reinforcement, carbonaceous material as matrix, and chemical composition as a single carbon element. C / C composite materials have excellent properties such as low density, high specific modulus, high specific strength, low thermal expansion coefficient, high specific strength, good thermal shock resistance and friction and wear performance, and are widely used in aviation, aerospace, nuclear energy, electronics and other fields . However, the serviceability of C / C composites is poor in high-temperature and oxygen-enriched environments, and C / C composites are easily oxidized with oxygen, which seriously affects the service life of C / C composites. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/88C04B41/87
CPCC04B41/009C04B41/5133C04B41/5071C04B41/88C04B41/87C04B41/4525C04B35/83C04B41/5057C04B41/5059
Inventor 孙威邓南军熊翔张红波
Owner CENT SOUTH UNIV
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