Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Sintering Properties of UO2+5wt% CeO2Compacts Using Microwave

마이크로파를 이용한 UO2+5wt% CeO2성형체의 소결특성

  • 정창용 (한국원자력연구소 미래형원자로연료개발부) ;
  • 이수철 (한국원자력연구소 미래형원자로연료개발부) ;
  • 김시형 (한국원자력연구소 미래형원자로연료개발부) ;
  • 김한수 (한국원자력연구소 미래형원자로연료개발부) ;
  • 이영우 (한국원자력연구소 미래형원자로연료개발부)
  • Published : 2004.11.01
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Abstract

The heat generation tests of SiC and MO$_2$ samples by use of a microwave heating system were carried out and UO$_2$+5 wt% CeO$_2$ pellets were sintered in a microwave furnace in an oxidizing atmosphere, by taking into account the characteristics of the microwave heating obtained from the heat generation tests. The characteristics of pellets sintered in a microwave furnace were analysed and compared with those of the pellets sintered in a conventional electrical furnace. The temperature of MO$_2$ pellets with microwave heating increased quickly with input power and the variation of output power depended on the reaction characteristics of SiC and MO$_2$ with microwave. The sintered density of UO$_2$+5wt% CeO$_2$ pellets sintered in the microwave furnace was lower about 2% T.D. than that of the pellets sintered in an electrical furnace with sintering parameters. The microstructure of pellets sintered in microwave furnace has a broader pore distribution but has a larger grain size than that of the pellets sintered in the electrical furnace.

마이크로파 가열장치를 이용하여 마이크로파 조사에 따른 SiC와 MO$_2$ 시료에 대한 발열실험을 수행하였고, 이 실험에서 얻은 발열특성 결과들을 고려하여 $UO_2$+5wt% CeO$_2$ 성형체에 대한 산화소결 실험을 수행하였다. 그리고 마이크로파와 전기로에서 각각 소결된 MO$_2$ 소결체의 특성변화를 비교분석하였다 마이크로파 조사에 따른 MO$_2$시료의 발열온도는 입력전력의 증가에 따라서 급속히 증가하였으며, 출력전력은 주로 보조가열재인 SiC와 MO$_2$ 시료가 마이크로파와 반응하는 정도에 따라서 변하였다. 마이크로파에 의하여 소결된 소결체의 밀도는 전기로에서 동일한 조건으로 소결된 소결체의 밀도보다 약 2% T.D. 낮았다. 소결체의 미세조직은 전기로에서 제조된 소결조직에 비하여 마이크로파에 의해 제조된 소결체의 기공분포가 불규칙적이었으나, 평균결정립 크기는 크게 나타났다.

Keywords

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