This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1088/0031-8949/2011/T145/014030 in citations.
Deposition and qualification of tungsten coatings produced by plasma deposition in WF6 precursor gas
Deposition and qualification of tungsten coatings produced by plasma deposition in WF6 precursor gas
A strong R&D programme is at present ongoing to qualify tungsten as the plasma-facing material in ITER and possible future devices. Since the use of solid W tiles poses a number of problems, mainly with respect to increased forces, weight and costs, W coatings on graphite wall tiles are often us...
Saved in:
Personal Name(s): | Philipps, V. |
---|---|
Kogut, D. / Esser, H.G. / Sergienko, G. / Zlobinski, M. / Coenen, J.W. / Brezinsek, S. / Nachtrodt, F. / Sanyasi, A.K. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Physica scripta, T145 (2011) S. 014030 |
Imprint: |
Bristol
IoP Publ.
2011
|
Physical Description: |
014030 |
DOI: |
10.1088/0031-8949/2011/T145/014030 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Physica Scripta
T145 |
Subject (ZB): | |
Publikationsportal JuSER |
A strong R&D programme is at present ongoing to qualify tungsten as the plasma-facing material in ITER and possible future devices. Since the use of solid W tiles poses a number of problems, mainly with respect to increased forces, weight and costs, W coatings on graphite wall tiles are often used instead. These coatings are deposited in a special deposition apparatus, while in situ plasma-assisted techniques are widely used for low-Z wall coatings such as, for example, in carbonization, boronization or siliconization. To develop a similar procedure for the in situ coating of plasma-facing materials with tungsten, a deposition technique based on a mixture of 95% H-2 and 5% WF6 was analysed. Tungsten coatings up to 0.5 mu m have been deposited in laboratory experiments and the coatings were characterized by a number of methods. The W coatings deposited on fine-grain graphite have a dense structure with a rough surface and are free of fluorine. The coatings show excellent high-heat-flux resistance with no failures in transient heat flux tests up to 600-700 MW m(-2) for 1 ms. |