Among LTCC material for substrate, the crystallized anorthite system was mainly studied as high strength material. However, specific factors that have affected on strength of material were studied insufficiently on anorthite system. In this study, the composition of anorthite glass was Ca-Al-Si-Zn-O. The changes of phase and microstructure were observed with the amount and the particle size of glass and the sintering temperature. It was studied that the factors affected on the strength of material. Phases of anorthite and ZnAl2O4 were formed with the increase of sintering temperature. The Al2O3 phase was increased with Al2O3 amount, acted as filler, and the strength of material is increased with Al2O3 phase. But phases of anorthite and ZnAl2O4 didn't affect on the strength of material. In the case of 60 vol% glass amounts and below 3.2 ㎛ of glass particle size, the strength of material was decreased. It is thought that the decrease of strength was due to non-homogeneous mixing between glass powder and filler.
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