A novel type of composite LTCC material for high flexural strength application

Abstract A novel high flexural strength Low-temperature co-fired ceramic (LTCC) material, xAl2O3+ (1-x) BaO-Al2O3-SiO2-B2O3-ZnO-CaO-MgO (x = 35-50 wt. %) glass-ceramics, was synthesized by conventional solid-state reaction method. The activation energy, phase assemblage, thermal properties, mechanical properties, chemical compatibility with Cu and microwave dielectric properties of the prepared samples were discussed. The composites (x = 35-50 wt. %) could be densely sintered at 950℃/2 h. With the content of Al2O3 increasing, the coefficient of thermal expansion (CTE) increases from 6.7 × 10-6/K to 7.2 × 10-6/K, and the flexural-strength first increases from 280 to 360 MPa, and then decreases from 360 to 240 MPa. The xAl2O3+ (1-x) BaO-Al2O3-SiO2-B2O3-ZnO-CaO- MgO (x = 35-50 wt. %) glass-ceramics sintered at 950℃ for 2 h has the excellent dielectric properties and mechanical properties at x = 45 wt. %: er = 7.6, tanδ = 3.01 × 10-4 at1 MHz, τf=-35.25 ppm/℃, CTE = 6.79 × 10-6/℃, flexural strength = 360 MPa.