等离子喷涂熔滴铺展凝固行为研究现状

doi:10.11896/cldb.22080031

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Abstract Plasma spraying is essentially a process of using plasma gas as a heat source to heat metal or ceramic powder to droplets under a certain temperature and speed. These droplets hit, spread and solidify on the surface of the substrate. This process has an important impact on the quality of the coating. In this paper, three aspects of the process of droplet impact, spreading, and solidification in plasma spraying are summarized: the spread-solidification behaviour of single and multiple droplets, factors influencing spread-solidification, and causes of bonding and cracks during droplet solidification. When the cooling rate differs, the molten droplets first spread and then solidify, or they solidify while spreading after hitting the substrate. Different types of pores appear because of the different positions of the subsequent droplet impacts. Given the different lattice parameters and subcooling degrees, the solidification mode primarily includes unsteady solidification and epitaxial growth. The factors affecting spread-solidification are gas capture, droplet bottom solidification, and matrix preheating. Increasing the particle and matrix temperatures and reducing the heat transfer of the matrix can promote interfacial bonding during solidification, and the appropriate piecewise crack density can improve the performance of the coating significantly. Examining the droplet spread-solidification behaviour and stacking process can clarify the cause of formation of internal defects in the coating and improve understanding of the formation mechanism of the coating. Thus, the quality control of the coating can be guided more scientifically.

Key words： plasma spraying spreading behaviour solidification mechanism substrate temperature metallurgical bonding crack

Published: 25 March 2024 Online: 2024-04-07

CLC number:

TG174

Fund:National Natural Science Foundation of China (52075542, 52130509, 52105235) and 145 Project.

Corresponding Authors: ^*hzaam@163.com

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	Articles by authors
	XIAO Song
	LIU Ming
	ZHANG Xiaolong
	HUANG Yanfei
	WANG Haidou

Cite this article:

XIAO Song,LIU Ming,ZHANG Xiaolong, et al. Research Status of Molten Droplet Spreading and Solidification Behaviour in Plasma Spraying[J]. Materials Reports, 2024, 38(6): 22080031-12.

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http://www.mater-rep.com/EN/10.11896/cldb.22080031 OR http://www.mater-rep.com/EN/Y2024/V38/I6/22080031

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