@article{8722,
  author = {Z. Chen and Y. Li and L. Cheng and Z. Wang and Y. Lian and X. Liu and F. Feng and J. Wang and Y. Tan and T. W. Morgan and G.H. Lu and X. Ye and B. Yan and J. Song and M. Xu and X.R. Duan},
  title = {Recent progress of thick tungsten coating prepared by chemical vapor deposition as the plasma-facing material},
  abstract = {Chemical vapor deposition (CVD) is a promising technique for the preparation of W-based plasma-facing materials (PFMs). An overview of the microstructure, chemical composition, thermal conductivity, thermal stability, thermal shock performance under disruption-like and edge localized mode-like transient heat load, and neutron irradiation performance of CVD-W has been given in our previous work. However, for fusion applications, additional properties need to be assessed. To this end, deuterium (D) permeability, D plasma irradiation performance, and thermal fatigue resistance of CVD-W were investigated in this work. The results showed that the D permeability of CVD-W in the temperature range of 973–1173 K was larger than that of the commercial pure W, which was related to the columnar grain structure of CVD-W. Additionally, both CVD-W and commercial pure W were exposed to D plasma up to a fluence of 1 × 1026 m−2. Compared to commercial pure W, CVD-W exhibited a mitigated blistering behavior and lower D total retention, which could be attributed to its strong [001] crystallographic texture along the thickness direction and a lower number of defect density (e.g. grain boundaries). CVD-W and commercial pure W were also exposed to steady-state and transient heat load simultaneously, leading to a base surface temperature and surface temperature increase of about 953–1473 K and 250–300 K, respectively. A strong grain orientation dependence of the surface degradation induced by the combined heat load has been found. Consequently, CVD-W exhibited a much more uniform plastic deformation than pure W, and no surface cracks along grain boundaries were observed in CVD-W. Finally, the industrial-scale production of CVD-W-based PFMs and mockups was demonstrated. This work paves the way for the fusion applications of thick CVD-W coatings.
},
  year = {2021},
  journal = {Nuclear Fusion},
  volume = {61},
  pages = {126024},
  publisher = {IOP Publishing},
  doi = {10.1088/1741-4326/ac2e2d},
  language = {eng},
}