Titanium carbide coatings fabricated by the vacuum plasma spraying process
| Autor: | D.J. Varacalle, Herbert Herman, G.A. Bancke, L.B. Lundberg |
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| Rok vydání: | 1996 |
| Předmět: |
Titanium carbide
Materials science Metallurgy Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Indentation hardness Surfaces Coatings and Films chemistry.chemical_compound chemistry Vacuum deposition Coating Materials Chemistry Surface roughness engineering Thermal spraying Porosity Plasma processing |
| Zdroj: | Surface and Coatings Technology. :70-74 |
| ISSN: | 0257-8972 |
| Popis: | Titanium carbide (TiC) coatings are of interest in various wear applications and, in particular, in fusion reactors. In this study, TiC coatings were deposited on graphite substrates. Vacuum plasma spraying was used to maximize the density of the as-sprayed coating and to prevent formation of undesirable phases. A Taguchi style, fractional-factorial L4 design of experiment was employed to evaluate the effect of three plasma processing variables on coating attributes. The gun parameters varied were current (680–720 A), argon primary gas flow (35–45 slpm), and hydrogen secondary gas flow (8–12 slpm). The resulting as-sprayed coating attributes evaluated were thickness, superficial hardness, microhardness, surface roughness, and porosity. The results of the study indicate that higher power-to-flow volume ratios and higher ratios of secondary hydrogen flow to the total flow will result in more molten particles, better powder deposition, and lower porosity for this particular vacuum plasma spray (VPS) application. |
| Databáze: | OpenAIRE |
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