초고온용 발열체 (Mo₁₋xWx)Si₂의 산화거동에 대한 연구
Oxidation behavior of (Mo₁₋xWx)Si₂ high-temperature heating elements
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초록
SHS 법으로 MoSi₂ 분말, (Mo1/2W1/2)Si₂ 분말 및 WSi₂ 분말을 합성하고 이 분말들을 500°C, 1,000°C, 1,200°C,1,300°C, 1,400°C, 1,500°C 및 1,600°C에서 열처리한 다음, 결정구조 및 열중량 변화 등을 관찰하였다. Mo-W-Si계의 silicide분말은 500°C의 저온에서도 산화 반응이 일어나며, 저온 산화 및 분해로 생성되는 결정상은 MoO3이었다. 1,200°C 이상에서 열처리를 한 경우에 분해반응으로 생성된 SiO₂의 결정상은 상온에서 흔히 관찰되는 α-quartz가 아닌 α-cristobalite 상으로 생성되었다. W이 포함되면 저온과 고온에서 분해 반응이 더 많이 일어나는 것으로 나타났으며, 분말을 성형하여 소결한 시편의 경우에 MoSi₂와 (Mo1/2W1/2)Si₂는 저온이나 고온에서 1시간 열처리를 하더라도 저온산화에 의한 분해와 그에 따른 질량 변화 반응을 관찰하기 어려웠지만 WSi₂는 저온 산화에 의하여 소결 자체가 어려웠다.
Abstract
MoSi2, (Mo1/2W1/2)Si2, and WSi2 powders were synthesized by self-propagating high-temperature synthesis (SHS)method. The synthesized powders were heat-treated at 500, 1,000, 1,200, 1,300, 1,400, 1,500 and 1,600°C in ambientatmosphere. Oxidation of Mo-W silicide powder was found at low temperature of 500°C. XRD structure analysis and DTA/TG data showed that MoO3 was formed with 500°C heat treatment for 1 hour, and that it was α-cristobalite phase that was formed with 1200°C heat treatment, not α-quartz phase which is commonly found and stable at room temperature. Existence of W accelerated decomposition at both low and high temperature. Fully sintered MoSi2 and (Mo1/2W1/2)Si2 specimen did not show decomposition or weight loss by oxidation, with 1 hour heat treatment at either low or high temperature. Notably, it was difficult to sinter WSi2 because of oxidation reaction at low temperature.
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