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2022 | OriginalPaper | Chapter

3. Impact Spread Behavior of Flying Droplets and Properties of Splats

Authors : Guozheng Ma, Shuying Chen, Haidou Wang

Published in: Micro Process and Quality Control of Plasma Spraying

Publisher: Springer Nature Singapore

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Abstract

According to the transfer phenomenon of momentum, heat and mass occur in the interaction process between spraying particles and the plasma jet flow. When they reach the substrate surface, sprayed particles spread and rapidly solidify to form the most basic unit of the coating, a flattened particle called the “splat.” From a macro perspective, the whole of the coating is usually formed when a large number of splats accumulate as particles overlap one another and stack layer by layer. Therefore, it is the spreading and solidification behavior of such flattened molten droplets and the statistical rule of stacking with multiple molten droplets that directly determines the quality of coating (which consists of factors such as content of defects, residual stress, microstructure, mechanical properties, etc.). It was learned from a large number of spray trials that after entering the plasma jet flow, sprayed particles usually have different flight characteristics due to their differences in path, jet characteristics (temperature, velocity, component feature, etc.) and intrinsic particle structure (particle size, material properties, geometric structure, and phase composition). These differences may significantly affect the deposition behavior of a single droplet after it has hit the substrate.

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previous chapter Microcosmic Interaction Between Plasma Jet and Spraying Particles
next chapter Characterization of Primary Defects and Quality Evaluation of Coatings
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Metadata
Title
Impact Spread Behavior of Flying Droplets and Properties of Splats
Authors
Guozheng Ma
Shuying Chen
Haidou Wang
Copyright Year
2022
Publisher
Springer Nature Singapore
Book
Micro Process and Quality Control of Plasma Spraying

Print ISBN: 978-981-19-2741-6

Electronic ISBN: 978-981-19-2742-3

Copyright Year: 2022

DOI
https://doi.org/10.1007/978-981-19-2742-3_3

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