Influence of Zn/Ba ratio on crystallization, sintering behavior and properties of CaO-Al2O3-SiO2 glass-ceramics

The influence of Zn/Ba ratio on crystallization, sintering behavior and properties of CaO-Al 2 O 3 -SiO 2 (CAS) glass-ceramics was investigated. As the Zn/Ba ratio increases, the main crystal phase changes from wollastonite (CaSiO 3 ) to hardystonite (Ca 2 ZnSi 2 O 7 ). A proper Zn/Ba ratio facilitates the sintering and crystallization processes , thereby resulting in a dense structure and enhancing mechanical strength . CAS glass-ceramics with a Zn/Ba ratio of 4/6 sintered at 950 °C exhibit superior characteristics, including a flexural strength of 193 MPa, Young's modulus of 79 GPa, thermal expansion coefficient of 5.11 × 10 −6 /°C, dielectric constant of 6.58, and dielectric loss of 2.7 × 10 −3 .