Effects of alumina fibers on densification and thermal properties of BBSCA/Al2O3 low temperature co-fired ceramic composites prepared via aqueous tape casting

Abstract

The application field of low temperature co-fired ceramics (LTCC) has been further expanded with the development of electronic packaging technology. Nevertheless, during the preparation process, solvents often volatilize leading to toxicity to humans and environmental pollution. Furthermore, in certain applications, LTCC materials must possess higher strength and thermal conductivity. Herein, we developed a kind of Bi₂O₃-B₂O₃-SiO₂-CuO-Al₂O₃(BBSCA)/Al₂O₃/Al₂O₃ fibers LTCC composites, synthesized by aqua-based molding and hot-press solid-state reaction method. The addition of Al₂O₃ fibers can construct the two-dimensional structure and enhance thermal conductivity of the composites. When the Al₂O₃ fibers content reaches 2 wt%, the resulting composite exhibits a significant bending strength of 308 MPa and an elevated thermal conductivity of 9.31 W/(m·K). Additionally, the composites exhibit excellent dielectric properties, with a dielectric constant of 10.17 and tanδ = 1.24 × 10⁻³ at 13 GHz. This work provides a novel approach to construct high-strength and high thermal conductivity LTCC based on environmentally friendly preparation processes.