| The relationship between composition and preparation technology of CSB/Al2O3 glass ceramic was researched.The effects of Al2O3 on properties of CSB/Al2O3 glass ceramic were studied. It is found that the sintering property and electric properties of CSB/Al2O3 glass ceramic can be improved with the increasing of Al2O3. Samples with 30 wt% Al2O3 can be sintered at 830℃. The bulk density of this material is 2.59g/cm3, the bending strength is106MPa, the resistivity is 16.2×1012Ω·cm, the dielectric constant and the dielectric loss at 1MHz are 7.08 and 1.17×10-3 respectivly.Influences of Li2O doping on properties of CSB/Al2O3 glass ceramic were researched. Results show that the densification and dielectric properties of this material can be improved with increasing of Li2O. Samples can be sintered at 800℃with 0.5 wt% Li2O. The bulk density of this material is 2.89 g/cm3, the bending strength is 116MPa, the dielectric constant and the dielectric loss at 1MHz are 8.6 and 1.0×10-3 respectivly. The sintering temperature of CSB/Al2O3 glass ceramic was increased to 820℃, when the content of Li2O was increased to 1.0 wt% sequentially. The bulk density of this sample is 2.49 g/cm3, the bending strength is 90MPa, the resistivity is 24×1012Ω·cm, the dielectric constant and the dielectric loss at 1MHz are 8.6 and 1.0×10-3 respectivly.The effects of P2O5 and ZnO on properties of CSB/Al2O3 glass ceramic were discussed. Results show that densification behavior, microstructure of CBS/Al2O3 glass ceramic can be improved by increasing the content of P2O5, but the dielectric constant will be increased. Appropriate content of ZnO in the starting materials in CBS also can enhance sintering property and dielectric properties of CBS/Al2O3 glass ceramic. Samples with 2.28 wt% P2O5 and 3 wt% ZnO can be sintered at 810℃. The bulk density of this material is 2.71 g/cm3, the bending strength is 120MPa, the dielectric constant and the dielectric loss at 1MHz are 8.6 and 1.27×10-3 respectivly.Influences of CBS with an appropriate heat treatment for controlling crystallization on properties of CSB/Al2O3 glass ceramic were investigated. Identification and quantification of crystalline phases precipitated from CBS glass after heat treatment were performed using X-ray diffraction. Results show that densification behavior, dielectric properties and microstructure of CBS/Al2O3 glass ceramic can be improved by selecting appropriate crystalline phases. CBS/Al2O3 glass ceramic can be sintered at 800℃～830℃,using glass powder with CaSiO3, CaB2O4 and Cristobalite as its crystal phases, and quantification of those crystal phases is 88.56%. The bulk density of samples that be sintered at 810℃is 2.75 g/cm3, the dielectric constant and the dielectric loss at 1MHz are 8.44 and 0.9×10-3 respectivly. |
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