Influence of Sm_2O_3 Additive on BaO-Al_2O_3-B_2O_3-SiO_2 Glass-Ceramics for CBGA Package

摘要

Sm_2O_3 additive significantly influenced the microstructure, mechanical, and electrical properties of BaO-Al_2O_3-B_2O_3-SiO_2 glass-ceramics. The calculation by the whole pattern fitting method based on XRD patterns revealed that Sm_2O_3 additive improved the crystallization process of this tetra-system and promoted the formation of major phase quartz. The sintering kinetics showed that Sm_2O_3 addition markedly reduced the sintering activation energy from 406.86 kJ/mol to 391.38 kJ/mol, which benefited the sintering densification and the grain growth, and thus enhanced mechanical properties. Doping 2% Sm_2O_3 reinforced the flexure strength from 136.3 to 171.6 MPa and the Young's modulus from 49.4 to 79.7 GPa. It also exhibited low dielectric constant of 5.31, low dielectric loss of 5.30× 10~(-4), and high thermal expansion coefficient of 11.76 × 10~(-6)/°C.