| Autor: |
Neiser, R., Smolik, G., Hollis, K., Watson, R. |
| Zdroj: |
Journal of Thermal Spray Technology; Dec1993, Vol. 2 Issue 4, p393-399, 7p |
| Abstrakt: |
Tungsten coatings are being considered for a variety of uses inside fusion reactors. Measurements of several properties of vacuum plasma- sprayed tungsten important for fusion energy applications are reported. Of vital concern is the thermal conductivity of the sprayed tungsten. Over the temperature range 25 to 1500 ‡, the thermal conductivity was approximately 60% of the value for high- purity tungsten. Of greater importance to reactor safety is the reactivity of tungsten with steam. It was found that the volatilization and reaction rates of plasma-sprayed tungsten from 800 to 1200 ‡ are similar to hot rolled tungsten. Several other useful properties have also been reported. The elastic constants of the sprayed tungsten were measured ultrasonically. The deposits were anisotropic; for example, the Young's modulus measured in a direction parallel to the substrate was greater than that measured in the direction perpendicular to it, and their elastic moduli were approximately 30% lower than tabulated values for bulk tungsten. The average bulk density of the sprayed tungsten was approximately 17.4 g/cm , which is 90% of the theoretical density. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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