| 자전연소합성법으로 제조된 SiO2 첨가된 MoSi2 분말 내에서의 SiO2의 거동 연구 |
| 나사균, 전민석1, 송준광1, 한동빈2, 정철원2, 김성수3, 이연승4 |
한밭대학교 재료공학과
1한국산업기술시험원 재료평가센터
2(주)위너테크놀로지
3목원대학교 기술마케팅학과
4한밭대학교 정보통신공학 |
| SiO2 Behavior of MoSi2 Powders Containing SiO2 Synthesized by SHS Method |
| Sa-Kyun Rha, Min-Seok Jeon1, Jun-Kwang Song1, Dong-Bin Han2, Cheol-Weon Jeong2, Sung-Soo Kim3, Youn-Seoung Lee4 |
Department of Materials Science and Engineering, Hanbat National University
1Material Analysis Team, Reliability Technical Center, Korea Testing Laboratory
2Winner Technology Co., LTD.
3Department of Techo-Marketing, Mokwon University
4Department of Information Communication Engineering, Hanbat National University |
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| ABSTRACT |
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In order to investigate the behavior of $SiO_2$ in the molybdenum silicide powders, crystal structure of these powders was measured by XRD, in addition, surface composition and surface phase (or chemical states) and microstructure were analysed by XPS and TEM, respectively. Mo-silicide powders containing $SiO_2$ were synthesized by SHS (Self-Propagating High-Temperature Synthesis) technique. In XRD result, according to increase of $SiO_2$ contents, the crystal structure for synthesized $MoSi_2$ powders was still typical $MoSi_2$ bct without any other phases. By XPS analysis, the surface of Mo and Si source powders was covered with $MoO_3$ and $SiO_2$, respectively, and the surface of synthesized $MoSi_2$ powder was also covered with $MoO_3$ and $SiO_2$, which were stable oxides at room temperature. However, according to increase of $SiO_2$ addition, $MoSi_2$ phase in XPS spectra decreased and $SiO_2$ phase increased relatively in synthesized $MoSi_2$ powders. From the results by XPS and XRD, we found that the existent $SiO_2$ has amorphous structure. In the microstructure, the small particulates of the synthesized products added $SiO_2$ agglomerated together to form larger clusters (from ~10 nm to ~1 ${mu}m$). From TEM, XPS, and XRD results, we found that the out layer of agglomeration of synthesized $MoSi_2$ powder is surrounded by amorphous $SiO_2$. |
| Key words:
$MoSi_2$, $SiO_2$, Self-propagating high temperature synthesis(SHS), XRD, XPS |
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