한국분말야금학회:학술대회논문집 (Proceedings of the Korean Powder Metallurgy Institute Conference)

한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
권호 표지

Study on Oxidation Behavior of (W,Mo)$Si_2$ Powders in Air at 400, 500 and $600^{\circ}C$

  • Peizhong, Feng (School of Materials Science and Engineering, University of Science and Technology Beijing) ;
  • Xuanhui, Qu (School of Materials Science and Engineering, University of Science and Technology Beijing) ;
  • Xiaohong, Wang (School of Materials Science and Engineering, China University of Mining and Technology) ;
  • Farid, Akhtar (School of Materials Science and Engineering, University of Science and Technology Beijing)
  • 발행 : 2006.09.24
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초록

The oxidation of (W,Mo)$Si_2$ powders has been investigated at 400, 500 and $600^{\circ}C$ for 12.0 hours in air. It was shown that the low temperature oxidation resistance of (W,Mo)$Si_2$ was worse than that of $MoSi_2$, and they showed great changes in mass, volume and colour. Especialy at $500^{\circ}C$, the amount of volume expansion of (W,Mo)$Si_2$ was as high as about $7\sim8$ times and color changed from black to yellow after 4.0h with $MoO_3$, $WO_3$, (W,Mo)$O_3$ and amorphous $SiO_2$ as main reaction products. The mass gain and oxidation rate were relatively slower at $400^{\circ}C$ and $600^{\circ}C$ than that at $500^{\circ}C$.

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