Abstract
Molybdenum has been proposed as a material for protective or liner plates of fusion reactor first wall components. To avoid the introduction of high Z impurities such as molybdenum into the plasma, low Z coatings for the molybdenum are required. We investigated controlled heating of the substrate during deposition in an attempt to obtain strong adhesion across a film-substrate boundary. Using acetylene gas as the carbon source titanium carbide was ion plated onto the molybdenum substrate, whose temperature was increased at a rate of 40-80°C min-1 and finally maintained at 800°C or more until the end of the coating process. Coatings about 25 μm in thickness obtained by this method were thermally cycled 100 times with an IR image furnace between 200-1200°C at a heating rate of 100°C s-1; no evidence of adhesion failure was obtained. Vanadium carbide coatings also showed good resistance against film exfoliation, although microcracks were observed after the thermal cycle test.
Original language | English |
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Pages (from-to) | 271-277 |
Number of pages | 7 |
Journal | Thin Solid Films |
Volume | 80 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 1981 Jun 19 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry