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Spraying powder, hot-sprayed in-situ synthesized zirconium boride-zirconium carbide base ceramic coating and preparation method thereof

A ceramic coating and zirconium carbide-based technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of poor density and many pores of ceramic-based coatings

Active Publication Date: 2016-02-17
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting points of carbides and borides, the preparation of carbide and boride ceramic-based coatings by thermal spraying in the prior art can only prepare single-component coatings, such as zirconium boride coatings or zirconium carbide coatings , and the prepared ceramic-based coating has poor compactness and more pores
[0005] At present, there is no report on the preparation of ceramic-based coatings containing both zirconium boride and zirconium carbide by thermal spraying.

Method used

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  • Spraying powder, hot-sprayed in-situ synthesized zirconium boride-zirconium carbide base ceramic coating and preparation method thereof
  • Spraying powder, hot-sprayed in-situ synthesized zirconium boride-zirconium carbide base ceramic coating and preparation method thereof
  • Spraying powder, hot-sprayed in-situ synthesized zirconium boride-zirconium carbide base ceramic coating and preparation method thereof

Examples

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preparation example Construction

[0043] The invention provides a method for preparing a zirconium boride-zirconium carbide based ceramic coating in situ by thermal spraying, comprising:

[0044] Plasma spraying is carried out on the spraying powder to obtain thermal spraying in-situ synthesis of zirconium boride-zirconium carbide based ceramic coating, and the spraying powder is the spraying powder described in the above technical solution.

[0045] In the invention, the sprayed powder is subjected to plasma spraying to obtain thermal spraying in-situ synthesis of zirconium boride-zirconium carbide based ceramic coating. In the present invention, the spraying powder is consistent with the spraying powder described in the above technical solution, and will not be repeated here.

[0046] In an embodiment of the present invention, the current during the plasma spraying process is 550A-650A; in other embodiments, the current during the plasma spraying process is 580A-620A; in another embodiment, the The current ...

Embodiment 1

[0061] 3 microns of aluminum powder (purity > 98%), 10 microns of zirconium hydride powder and 15 microns of boron carbide powder are fully mechanically mixed according to the mass ratio of 30:58.5:11.5 to obtain a mixture;

[0062] The mixture is granulated by spray-drying granulation to obtain a spray powder with a particle size of -140 to +325 mesh.

[0063] Carry out XRD detection to the spraying powder that the embodiment of the present invention 1 prepares, detection result is as follows figure 1 as shown, figure 1 For the XRD spectrum of the spray powder prepared in Example 1 of the present invention, by figure 1 It can be seen that the spray powder prepared in Example 1 of the present invention contains zirconium hydride, aluminum and boron carbide.

[0064] Carry out SEM detection to the spraying powder that the embodiment of the present invention 1 prepares, detection result is as follows figure 2 as shown, figure 2 For the SEM figure of the spray powder prepar...

Embodiment 2

[0066] 2 microns of aluminum powder (purity > 98%), 5 microns of zirconium hydride powder and 5 microns of boron carbide powder are fully mechanically mixed according to the mass ratio of 25:62.6:12.4 to obtain a mixture;

[0067] The mixture is granulated by spray-drying granulation to obtain a spray powder with a particle size of -180 to +280 mesh.

[0068] According to the method described in Example 1, the spray powder prepared in Example 2 of the present invention was tested. The test result was that the spray powder prepared in Example 2 of the present invention contained zirconium hydride, aluminum and boron carbide, and the spray powder Uniform particle size.

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Abstract

The invention provides spraying powder. The spraying powder comprises aluminum powder, zirconium hydride powder and boron carbide powder. Compared with the prior art, the spraying powder contains zirconium hydride, the zirconium hydride can replace metal zirconium so as to lower the spontaneous combustion risk of powder manufacturing and can be resolved to generate active zirconium and hydrogen gas in the spraying process, and the generated hydrogen gas can be ionized or combusted so as to further increase the temperature of a heat source and improve the reducing atmosphere; the spraying powder is good in liquidity and self-propagating reaction characteristic and can make a prepared ceramic base coating compact in structure and low in porosity. According to the invention, the compositions of the spraying powder are reasonably designed, the ceramic base coating mainly comprising zirconium boride and zirconium carbide can be synthesized in situ, and there is no need to spray zirconium boride powder and zirconium carbide powder independently for obtaining the ceramic base coating containing the zirconium boride and the zirconium carbide. The invention further provides the hot-sprayed in-situ synthesized zirconium boride-zirconium carbide base ceramic coating and a preparation method thereof.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a zirconium boride-zirconium carbide-based ceramic coating in-situ synthesized by spraying powder and thermal spraying and a preparation method thereof. Background technique [0002] Borides, carbides and their composite ceramic materials have the advantages of high melting point, high hardness, and good stability, and can be used to prepare ceramic coatings. They have broad application prospects in the fields of high temperature resistance, wear resistance, and ablation resistance. Boride-carbide composite ceramics show better advantages. At present, the preparation technology of boride-carbide composite ceramics and its coating has become a research hotspot in this field. [0003] The prior art usually adopts embedding method, vapor deposition method and reactive hot pressing method to prepare ceramic-based coatings composed of carbides or borides, wherein the efficiency of c...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/134
CPCC23C4/06
Inventor 朱胜郭永明于鹤龙宋占永魏敏王晓明商俊超
Owner ACADEMY OF ARMORED FORCES ENG PLA
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