The air plasma spray process is being investigated for the applicability to fabricate tungsten coatings and monoliths for applications in space power and propulsion, including heat pipes, solar absorption cavities, and reactor fuel clad structures. In this study, experiments were conducted using a statistical design of experiment methodology. The parameters varied included secondary to total gas flow ratio, total flow, and spray distance. The attributes evaluated were thickness, porosity, deposition efficiency, and grain structure. An optimized coating design based on minimum porosity was predicted by the statistical analysis. The coatings were characterized using image analysis and SEM. The as-sprayed coating microstructures were characterized by a mixture of lamella and partially melted tungsten particles. As-sprayed porosity of the coatings ranged from 1 to 13 %, based on image analysis.
Air plasma spraying of tungsten coatings
Luftplasmaspritzen von Wolframbeschichtungen
1995
6 Seiten, 3 Bilder, 2 Tabellen, 13 Quellen
Conference paper
English
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