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- 주제어 : $MoSi_2$ alloys (검색결과 2 건)
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Formation of nanocrystalline MoSi₂compound subjected to mechanical alloying
Chung-Hyo Lee 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.3
Molybdenum disilicide has been recognized as an attractive candidate material for high temperature structural applications. In this study, we have used mechanical alloying by a high-energy ball milling process to produce alloy powders of α-MoSi2 starting from mixtures of elemental molybdenum and silicon powders at room temperature. The α-MoSi2 plus Mo phases have been obtained by ball milling of a Mo33Si67 mixture of the pure elements for 100 hours, which was transformed to a single α-MoSi2 phase by subsequent heat treatment up to 725 oC. The grain size of the α-MoSi2 powders thus obtained was 19 nm, being approximately four times smaller than that of commercial alloy powders. It was also seen that the α-MoSi2 phase once formed begins to transform to the high-temperature β-MoSi2 phase when the total milling time exceeds 160 hours. Molybdenum disilicide has been recognized as an attractive candidate material for high temperature structural applications. In this study, we have used mechanical alloying by a high-energy ball milling process to produce alloy powders of α-MoSi2 starting from mixtures of elemental molybdenum and silicon powders at room temperature. The α-MoSi2 plus Mo phases have been obtained by ball milling of a Mo33Si67 mixture of the pure elements for 100 hours, which was transformed to a single α-MoSi2 phase by subsequent heat treatment up to 725 oC. The grain size of the α-MoSi2 powders thus obtained was 19 nm, being approximately four times smaller than that of commercial alloy powders. It was also seen that the α-MoSi2 phase once formed begins to transform to the high-temperature β-MoSi2 phase when the total milling time exceeds 160 hours.
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In-Process합성에 의한 고기능 금속간화합물의 복합성형
한정현,박성갑,박용호,Han, Jung-Hyun,Park, Seong-Kab,Park, Yong-Ho 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6
[ $MoSi_2$ ] alloys with Al, B or Nb were prepared by an advanced consolidation process that combined mechanical alloying with pulse discharge sintering (complex forming) to improve the mechanical properties. Their microstructure and mechanical properties were investigated. The $MoSi_2$ alloys fabricated by complex forming method showed very fine microstructure when compared with the sample sintered from commercial $MoSi_2$ powders. Alloys made from powders milled in Ar gas had fewer silica or alumina phases as compared to their counterparts sintered from powders milled in air. In densification of the sintered body, addition of B was more effective than Al or Nb. Both Victors hardness and tensile test indicated that the alloy fabricated by the complex forming method showed better properties than the sample sintered from commercial $MoSi_2$ powders. The Al added alloy sintered from the powders milled in air had the superior mechanical properties due to the suppression of $SiO_2$ and formation of fine $Al_2O_3$ particles.
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