Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Quantitative Analysis of High-Temperature Mullitization from a Multicomponent Oxide System

다성분 산화물 요업체의 고온 물라이트화 반응 정량분석

  • 신현호 (국방과학연구소, 제1연구개발본부) ;
  • 김철수 (국방과학연구소, 제1연구개발본부) ;
  • 김창욱 (국방과학연구소, 제1연구개발본부) ;
  • 장순남 (국방과학연구소, 제1연구개발본부) ;
  • 성완 (국방과학연구소, 제1연구개발본부) ;
  • 장동환 (한국 티타늄공업 주식회삭 부설 뉴세라믹스 연구소) ;
  • 강석원 (한국 티타늄공업 주식회삭 부설 뉴세라믹스 연구소) ;
  • 최석홍 (한 국티타늄공업 주식회삭 부설 뉴세라믹스 연구소)
  • Published : 1998.01.01
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Abstract

Mullitization in a multicomponent oxide system(alumina-kaolin-quartz-feldspar-talc) was studied as a function of sintering temperature from 1200 to 1500$^{\circ}C$ based upon a quantitative X-ray diffraction analysis. In the present study mullite grew as wiskers and its formation reaction showed characteristic there stages as follows In the first stage(1255-1295$^{\circ}C$) an appreciable mullitization(nucleation) occurred while corun-dum dissolution into glass (increasing glass content ) limited the rate of the reaction. At 1295-1335$^{\circ}C$ (second state) the reaction was significantly enhanced with a considerable glass consumption and with no appreciable change in corundum content. Finally (above 1335$^{\circ}C$) the reaction rate was attenuated re-markably with an apparent decrease in glass consumption rate. The impingement of mullite whiskers by oth-er whiskers and crystals was speculated to cause mullite growth in thickness direction with a slow growth rate resulting in the diminished reaction rate in the final stage.

Keywords

References

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