Crystal phase evolution, sintering, and strength of anorthite-based LTCC materials by substitution of M²⁺ (M=Mg, Sr, Ba) for Ca²⁺

LTCC, composed of Ca-Al-Si-O, is well-known for its high strength and phase stability. However research on the correlation of LTCC substrate composition and phase change to strength characteristics has rarely been reported. In this study, an anorthite glass component, group 2 elements, Mg, Sr, and Ba were substituted for Ca, and the resulting changes in the physical properties of the glass were observed. Then, the effect of varying glass composition on the characteristics of LTCCs was investigated. An increase in the Mg content caused an increase in the T _g of glass, sintering temperature of the glass/Al₂O₃ composite material and synthesis temperature of anorthite. The content of Sr and Ba had almost no correlation with T _g . Synthesis of BaAlO₄ and increased LTCC sintering temperature were observed with the addition of Ba, and high strength of over 320 MPa was demonstrated when glass, Al₂O₃ and a small amount of anorthite were formed.