Behaviour of plasma spray coatings under disruption simulation
The behaviour of metallic and ceramic protective coatings under disruption simulations was studied, correlating the damage with their physical and structural parameters. Plasma Spray (PS) and Vacuum Plasma Spray (VPS) were the techniques used for the production of the coatings. W-5% Re was selected for divertor plates, and TiC, TiO(2), Al(2)O(3), low-Z ceramic materials for the first wall protection on 316 SS, Cu and Al as substrates. An electron beam gun was used to simulate the plasma disruptions. The tests were carried out from 0.6 to 6 MJ/m2, The thermal effects were studied by metallographic and EDXA analysis. The damage was observed, comparing the degree of protection provided by each coating, to discover the minimum thickness necessary to prevent the underlying material from melting. Good protective coatings must have a high melting point, great porosity and low thermal conductivity. Such coatings act as thermal barriers, increasing the surface temperature and radiating back large parts of the energy.
Bibliographic Reference: Paper presented: 3rd International Conference on Fusion Reactor Materials, Karlsruhe (DE) Oct.4-8, 1987 Article: Journal of Nuclear Materials, Vols 155-157 (1988), pp. 267-272
Availability: Available from (1) as Paper EN 33527 ORA
Record Number: 198910405 / Last updated on: 1994-12-01
Original language: en
Available languages: en