The Effect of MgO Addition on Mullite

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J. Korean Ceram. Soc. > Volume 30(2); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(2): 93.

Mullite에 대한 MgO 첨가효과

조재우, 김영호, 이경희, 이병하

명지대학교 공과대학 무기재료공학과

The Effect of MgO Addition on Mullite

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.