二次烧成对CaO-B2O3-SiO2系微晶玻璃结构和性能的影响

研究一次和二次烧成对CaO-B2O3-SiO2(CBS)微晶玻璃的烧结性能与介电性能的影响。用X线衍射(XRD)、扫描电镜(SEM)等分析探讨二次烧成对CBS微晶玻璃的微观结构与介电性能的关系。结果表明:与一次烧成相比,二次烧成能够促进玻璃体中的小晶粒生长,试样的收缩率和体积密度有所增加,有利于介电常数提高和介质损耗的降低,且体系中没有出现新的晶相;875℃烧结的试样,X/Y轴收缩率均为14.33%,体积密度达到2.46 g/cm3,10MHz介电常数和损耗相应为6.21和3.5×10-3,热膨胀系数为11.86×10-6/℃,抗折强度为157.36MPa。

Effects of second sintering on structure and properties of CaO-B2O3-SiO2 glass ceramics

CaO-B2O3-SiO2(CBS) glass ceramics was prepared by dry-process.The effects of first sintering and second sintering on sintering properties and dielectric properties at 10 MHz were investigated.The relationships among second sintering,micro-structures and dielectric properties of CBS glass ceramics were studied by X-ray diffraction(XRD) and scanning electron microscope(SEM).The results indicated that compared with the first sintering,the second sintering had some effects on obtaining small size grain,increasing shrinking & the bulk density and optimizing microwave dielectric properties,No new crystalline phase was observed in the systems.The sample could be sintered at 875 ℃ with X/Y shrinking of 14.33% and the density of 2.46 g/cm3.It had a dielectric constant of 6.21,a dielectric loss of 3.5×10-3 at 10 MHz.And the CTE value of CBS glass ceramics measured at on temperature of 875 ℃ was 11.86×10-6/℃,the flexure strength was 157.36 MPa.