The Effect of Yttrium Oxide on the Sintering Behavior and Hardness of Tungsten

In this study, the relative density and hardness of Y2O3 dispersed tungsten alloy were investigated as function: of the Y2O3 content and sintering temperature. The sintering temperature and the amount of the second phase were varied from 1800 to 2500℃ and 0 to 2.0 weight pct, respectively. The relat...

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Bibliographic Details
Published in:Metals and materials international 2006, 12(3), , pp.245-248
Main Authors: Young Moo Kim, Moon Hee Hong, Sung Ho Lee, Eun Pyo Kim, Seong Lee, Joon Woong Noh
Format: Article
Language:Korean
Subjects:
hardness
relative density
transition temperature
tungsten
yttrium oxide
재료공학
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Summary:In this study, the relative density and hardness of Y2O3 dispersed tungsten alloy were investigated as function: of the Y2O3 content and sintering temperature. The sintering temperature and the amount of the second phase were varied from 1800 to 2500℃ and 0 to 2.0 weight pct, respectively. The relative density of the alloy is higher than that of pure tungsten in the range from 2000 to 2500℃, whereas the density is lower a 1800℃. As the Y2O3 content increases, the sintered density increases at a given temperature. The transition temperature (T(t)), where the relative density of the alloys exceeds that of pure tungsten, is reduced with increase Y2O3 particle content. In order to examine the effect of the second phase on the mechanical property, the hardness of pure tungsten and the alloys are measured. The hardness is mainly dependent upon the relative density of the alloys, rather than the amount of the second phase and tungsten grain size. The relationship between hardness and density is discussed according to the plasticity theory of porous materials.
ISSN:1598-9623
2005-4149