Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Effect of MgO Addition on Mullite

Mullite에 대한 MgO 첨가효과

  • 조재우 (명지대학교 공과대학 무기재료공학과) ;
  • 김영호 (명지대학교 공과대학 무기재료공학과) ;
  • 이경희 (명지대학교 공과대학 무기재료공학과) ;
  • 이병하 (명지대학교 공과대학 무기재료공학과)
  • Published : 1993.02.01
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Abstract

The effects of MgO addition on thermal expansiion coefficient and dielectric constant of mullite were studied. Thermal coefficient and dielectric constant decrease with increasing MgO content and exhibit a minimum value at 1wt% MgO. However, above 3wt% MgO content both values increase. Result of X-ray diffraction analysis how that mullite compositions which include more than 0.1wt% MgO form cordierite. Spinel is also formed as well as cordierite in the composition containing more than 3wt% MgO. The results indicate that addition of MgO affect the thermal expansion coefficient and dielectric constant of mullite substrate because of the formation of new phases; cordierite and spinel. The thermal expansion coefficient and dielectric constant are affected mainly by cordierite and spinel in the regions containing less than more than 3wt% MgO, respectively.

Keywords

References

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