Synthesis and Characteristics of Al₂O₃-doped α-CaSiO₃ Ceramics

Abstract

Calcium silicate ceramics with pseudo-wollastonite phase (α-CaSiO₃) were synthesized by solid state reaction method with different additions of Al₂O₃. The X-ray diffraction patterns show that the primary crystal phase of obtained samples is α-CaSiO₃. The addition of Al₂O₃ will induce a secondary phase of Ca₂Al₂SiO₇. The accounts of added Al₂O₃ and calcining temperatures have obvious influence on bulk densities, dielectric constants, and quality factors of α-CaSiO₃ ceramics. The α-CaSiO₃ ceramic with 3wt% addition of Al₂O₃ calcined at 1225°C has the best properties.

Keywords:

• α-CaSiO₃
• Al₂O₃
• microwave dielectric properties