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Failure modes of vacuum plasma spray tungsten coating created on carbon fibre composites under thermal loads

2009; Elsevier BV; Volume: 392; Issue: 1 Linguagem: Inglês

10.1016/j.jnucmat.2009.03.060

1873-4820

T. Hirai, N. Bekris, J.P. Coad, C. Grisolia, J. Linke, H. Maier, G.F. Matthews, V. Philipps, E. Wessel,

Fusion materials and technologies

Vacuum plasma spray tungsten (VPS-W) coating created on a carbon fibre reinforced composite (CFC) was tested under two thermal load schemes in the electron beam facility to examine the operation limits and failure modes. In cyclic ELM-like short transient thermal loads, the VPS-W coating was destroyed sub-layer by sub-layer at 0.33 GW/m2 for 1 ms pulse duration. At longer single pulses, simulating steady-state thermal loads, the coating was destroyed at surface temperatures above 2700 °C by melting of the rhenium containing multilayer at the interface between VPS-W and CFC. The operation limits and failure modes of the VPS-W coating in the thermal load schemes are discussed in detail.