低温烧结硼硅钙复相微晶玻璃的结构和性能

MICROSTRUCTURE AND PROPERTIES OF CALCIUM BOROSILICATE COMPOSITE GLASS-CERAMICS SINTERED AT LOW TEMPERATURE

在硼硅钙(CaO–B_2O_3–SiO_2,CBS)玻璃中添加硼硅酸玻璃,低温烧结制备了CBS复相微晶玻璃。研究了硼硅酸玻璃的添量及烧成温度对CBS复相微晶玻璃性能的影响规律。用X射线衍射和扫描电镜微观结构分析方法研究了材料性能与结构的关系。结果表明:硼硅酸玻璃与CBS玻璃具有很好的相容性,硼硅酸玻璃的质量分数(下同)为10%～40%的范围内均可在850℃烧结。随着硼硅酸玻璃的引入,样品中生成了具有低相对介电常数(εr)和高热膨胀系数(α)的α-石英。硼硅酸玻璃有效降低了材料的εr,实现了εr在5.6～6.6范围内可调。硼硅酸玻璃的添量小于20%时,α增加幅度较小,随着硼硅玻璃添量进一步增加(30%～40%),α显著增大。烧成温度的升高可促使玻璃中晶体析出和长大且析出晶相具有比CBS玻璃低的εr,样品的εr随着烧成温度的升高呈下降趋势。

Calcium borosilicate （CaO-B203-SiO2, CBS） glass based composite glass-ceramics were prepared by adding borosilicate glass. The effects of borosilicate glass and sintering temperature on the properties of the glass-ceramics were investigated. The rela- tionships between properties and structures were studied by X-ray diffraction and scanning electron microscope. The results show that the two glasses are compatible with each other with the borosilicate glass content of 10%-40% （in mass, the same below）. The composite powders of the two glasses could be sintered at a low temperature （850℃）. Due to the introduction of borosilicate glass, α-SiO2 with a low dielectric constant and high thermal expansion coefficient （CET, α） was formed. The relative dielectric constant （εr） decreases with increasing the borosilicate glass content, and it can be adjusted between 5.6-6.6. The a increases slowly when the borosilicate glass content is less than 20% and increases rapidly when the content ranges from 30% to 40%. Increasing the sintering temperature can promote crystallization. The dielectric constant decreases as the sintering temperature increases because the crystal has a lower constant than CBS glass.