• Title/Summary/Keyword: 자전고온합성

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Mathematical Modeling of Self-propagating High Temperature Synthesis of Molybdenum- Tungstenb Disilicide (이규화 몰리브덴-텅스텐의 자전 고온 합성 반응 모델링)

  • Yeon, Sun-Hwa;Jang, Dae-Gyu;Lee, Cheol-Gyeong
    • Korean Journal of Materials Research
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    • v.11 no.3
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    • pp.164-170
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    • 2001

  • The Self-propagating High-temperature Synthesis (SHS) for synthesizing ($Mo_{1-z}$ , $W_{z}$)$Si_2$was conducted experimentally with the mole fraction of Tungsten(W) from z=0.0 to z=0.5. The temperature profile was measured according to the reaction time through the thermocouple that was equipped into the center of these samples. When the reaction front is propagated around the thermocouple, the highest temperature appears and we regard this temperature as the adiabatic temperature. We found out by experimental results that the reaction velocity is in the range of 2.14~1.35mm/sec and the adiabatic temperature is in the range of 1883~1507K for the six samples. The reaction velocity and the adiabatic temperature were inclined to decrease with an increasing of the mole fraction of Tungsten (W). The SHS modeling is presented in order to predict the temperature profiles and these results are compared with the experimental results. It is predicted that in case of increasing the initial temperature of these six samples, the reaction temperature increased and that the sample of z=0.5 needs the preheating up to 800~900K in order to become reaction temperature 1900K.

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