Synthesis and characterization of crystallizable anorthite-based glass for a low-temperature cofired ceramic application

Abstract

We report successful identification and preparation of a glass composition in the CaO-Al2O3-SiO2 phase diagram with a judicious choice of fluxes that met all dielectric, electrical, and thermal property requirements for low-temperature cofired ceramic (LTCC) applications. The glass composition sintered at 900 degrees C attains good density (2.45 g/cc) and does not precipitate any crystalline phase. However, when this glass powder is sintered at the same temperature in the presence of 30 vol% cordierite, crystallization of the anorthite phase is observed, which improves the properties of the composite for LTCC application.