Preparation and performance of CaO-MgO-SiO2-Al2O3-CaF2 glass/Al2O3 ceramic with high flexural strength

A high flexural strength low temperature co-fired ceramic material was obtained by mixing the CaO-MgO-SiO2Al2O3-CaF2 glass and Al2O3 by the weight percentage of xAl2O3+(1-x)CaO-MgO-SiO2-Al2O3-CaF2 (x = 30, 35, 40 and 45 wt.%). The sintering behavior, crystalline component, mechanical, electrical and thermal properties were investigated in depth. The X-ray diffraction data demonstrated that Al2O3, CaMgSi2O6, and Mg2SiO4 were formed during the sintering process. The glass/ceramic composites with 35 wt.% Al2O3 sintered at 910 degrees C for 2 h exhibited excellent mechanical properties, with a flexural strength of 310 +/- 14 MPa. The excellent mechanical properties are mainly attributed to the following three aspects: grain refinement, improved fracture energy, and the synergistic effect of the relative contents of Al2O3 and the CaO-MgO-SiO2-Al2O3-CaF2 glass. The results suggest that the CaO-MgO-SiO2-Al2O3-CaF2 glass/Al2O3 composites can be regarded as promising candidates for low temperature co-fired ceramic substrate applications.