封孔剂降低热喷涂涂层孔隙率的研究进展

doi:10.11896/cldb.22030068

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Abstract As one of the key supporting technology of surface and remanufacturing engineering, thermal spraying technology integrates the preparation of surface protective coatings and the repair of metal components to meet the requirements of wear resistance, corrosion resistance, thermal barrier, electric conduction, catalysis, biological activity and so on. It has wide application prospect in aerospace, aviation, petrochemical industry, transportation and other industrial fields, and thermal spraying technology is an indispensable high-value-added manufacturing technology for high-end equipment manufacturing.
Research shows that the thermal spray coating formed by the accumulation of countless spray particle inevitably has structural defects (pores, cracks). However, with the requirements for the performance of equipment continue to increase, the working conditions of coatings tend to be more severe. On the one hand, the complex structural defects in the coating restrict the reliability of the equipment by affecting the comprehensive properties of the coating, such as mechanical properties and wear resistance; on the other hand, air, water, ions and other corrosive media can pass through open pores. It directly corrodes the substrate and causes the coating to fall off, limiting the life of the equipment. Therefore, domestic and foreign scholars are devoted to the research on the post-treatment of thermal spray coating. In the actual production process, the sealant has the significant advantages of technology, economy and versatility, so it is widely used in the post-treatment of thermal spray coatings.
Among them, organic sealant generally has stable chemical properties and better penetration ability, which can effectively close most of the open pores in the coating, block corrosion channels, and significantly improve the corrosion resistance of the coating. The inorganic sealant ge-nerally has a larger curing shrinkage rate, and the surface of the sealed coating is prone to cracks, resulting in its sealed effect being lower than that of the organic sealing agent. However, the thermal sprayed coating sealed by inorganic sealant has excellent high temperature resistance, mechanical properties and wear resistance.
In this paper, on the basis of analysing the formation mechanism of pores in thermal spray coatings and the influence of pores on the service performance of coatings, various sealant used in the sealing treatment of thermal spray coatings are introduced. Corrosion resistance and wear resistance of thermal spray coatings sealed with various sealant are comprehensively compared. The advantages and disadvantages of each sea-lant impregnation process are summarized, and the important problems existing in the sealing treatment technology of the sealant and the future development direction are pointed out.

Key words： thermal spray coating sealant porosity corrosion resistance wear resistance impregnation

Published: 25 October 2023 Online: 2023-10-19

CLC number:

TG174

Fund:National Natural Science Foundation of China (52130509) and 145 Project.

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	Articles by authors
	WANG Haozhen
	ZHOU Xinyuan
	LIU Ming
	JIA Lei
	HUANG Yanfei
	WANG Haidou

Cite this article:

WANG Haozhen,ZHOU Xinyuan,LIU Ming, et al. Research Progress of the Sealant Decreased Thermal Spray Coating Porosity[J]. Materials Reports, 2023, 37(20): 22030068-19.

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http://www.mater-rep.com/EN/10.11896/cldb.22030068 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22030068

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