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Synthesis Behavior of Ti-50.0 ~ 66.7at%Si Powders by In situ Thermal Analysis during Mechanical Alloying

기계적 합금화과정에서의 in situ 열분석에 의한 Ti-50.0~66.7at%Si 분말의 합성거동

  • 변창섭 (한밭대학교 신소재공학부 재료공학전공) ;
  • 이상호 (한밭대학교 신소재공학부 재료공학전공) ;
  • 이원희 (세종대학교 신소재공학과) ;
  • 현창용 (서울산업대학교 신소재공학과) ;
  • 김동관 (서울산업대학교 신소재공학과)
  • Published : 2004.05.01

Abstract

Mechanical alloying (MA) of Ti-50.0~66.7at%Si powders was carried out in a high-energy ball mill, and in situ thermal analysis was also made during MA. In order to classify the synthesis behavior of the powders with respect to at%Si, the synthesis behavior during MA was investigated by in situ thermal analysis and X-ray diffraction (XRD). In situ thermal analysis curves and XRD patterns of Ti-50.0~59.6at%Si powders showed that there were exothermic peaks during MA, indicating TiSi, $TiS_2$, and $Ti_{5}$ $Si_4$ phase formation by a rapid exothermic reaction of self-propagating high-temperature synthesis (SHS). Those of Ti-59.8~66.7 at%Si powders, however, showed that there were no peaks during MA, indicating any Ti silicide was not synthesised until MA 240 min. For Ti-50.0~59.6at%Si powders, the critical milling times for SHS increased from 34.5 min to 89.5 min and the temperature rise, $\Delta$T (=peak temperature-onset temperature) decreased form $26.2^{\circ}C$ to $17.1^{\circ}C$ as at%Si increased. The critical composition of Si for SHS reaction was found to be 59.6at% and the critical value of the negative heat of formation of Ti-59.6at%Si to be -1.48 kJ/g.

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References

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