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The study on low temperature sintering of nano-tungsten powders.
- Source :
-
International Journal of Refractory Metals & Hard Materials . Dec2016, Vol. 61, p273-278. 6p. - Publication Year :
- 2016
-
Abstract
- Ultrafine grain tungsten is a promising candidate for plasma facing component applications in future fusion reactors. The conventional press-and-sinter powder metallurgy method is a preferred route for producing ultrafine grain tungsten from nanosize tungsten powders. However, controlling grain growth, while simultaneously attempting to achieve maximum densification, has been a challenge for making UGF tungsten by sintering. In this study, the effect of processing parameters on the densification and grain growth of nano-W powders was investigated. Near-fully densified tungsten was obtained at sintering temperatures between 1100 and 1300 °C, and both Ar and H 2 sintering atmospheres were investigated. The Ar sintering atmosphere was determined to more favorably promote densification and minimize grain growth. The nanosized tungsten powder compacts were subjected to reduction in H 2 as a part of the sintering cycle. The reduction temperature was found to have significant effects on the sintering of nano-W powder, primarily as a result of grain coarsening, which was seen at temperatures as low as 700 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02634368
- Volume :
- 61
- Database :
- Academic Search Index
- Journal :
- International Journal of Refractory Metals & Hard Materials
- Publication Type :
- Academic Journal
- Accession number :
- 119161432
- Full Text :
- https://doi.org/10.1016/j.ijrmhm.2016.10.003