An investigation of the effects of droplet impact angle in thermal spray deposition
- Sandia National Labs., Albuquerque, NM (United States)
It is widely held that spraying at off-normal angles can influence deposition efficiency and the properties of the deposited material. However, little quantitative information on such effects has been published. This paper reports on a series of experiments to investigate the angular dependence of deposition efficiency, surface roughness, and porosity for several thermal spray materials and processes at incidence angles ranging from 90{degree} to 30{degree} relative to the substrate surface. At incidence angles from 90{degree} out to 60{degree}, the observed changes were small and often statistically insignificant. Some significant changes began to appear at 45{degree}, and at 30{degree} significant changes were observed for nearly all materials and processes: deposition efficiency decreased while surface roughness and porosity increased. It is proposed that droplet splashing may cause some of the observed effects.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 160509
- Report Number(s):
- CONF-940684--; ISBN 0-87170-509-5
- Country of Publication:
- United States
- Language:
- English
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