Studies of the air plasma spraying of chromium oxide powder
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
- Miller Thermal Inc., Appleton, WI (United States)
Experimental and analytical studies of the air plasma spray process have been accomplished in order to increase the deposition efficiency of chromium oxide powder. Numerical models of the plasma dynamics and the plasma-particle interaction are presented. The analytical studies were conducted to determine the parameter space for the empirical studies. Experiments were then conducted using a Box statistical design of experiment (SDE) approach. A substantial range of plasma processing conditions and their effect on the resultant coating is presented. The coatings were characterized by hardness tests and optical metallography (i.e., image analysis). Coating qualities are discussed with respect to hardness, porosity, surface roughness, deposition efficiency, and microstructure. Attributes of the coatings are correlated with the changes in operating parameters. An optimized coating design predicted by the SDE analysis is presented. The deposition efficiency of the powder was substantially increased to a maximum value of 65%. Several powder sieves were evaluated with the optimized process parameters.
- OSTI ID:
- 377783
- Report Number(s):
- CONF-9509182--; ISBN 0-87170-541-9
- Country of Publication:
- United States
- Language:
- English
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