Li_(2)O对钙硼硅系玻璃陶瓷结构与性能的影响

Influence of Different Li_(2)O Contents on Microstructure and Properties of CaO-B_(2)O_(3)-SiO_(2) Glass Ceramics

采用高温混熔法,制备不同Li_(2)O含量的CaO-B_(2)O_(3)-SiO_(2)玻璃陶瓷。考察Li_(2)O含量对该体系微观形态、烧结特性、介电性能等影响。结果表明:随着Li_(2)O含量增加,试样的烧结温度下降,烧结温度范围先变大后变小,烧结试样体积密度、介电性能、热力学性能都呈现出先增加再恶化的过程。当Li_(2)O含量为0.5mol%时,材料875℃烧结良好,性能优异,体积密度为2.55g·cm^(-1),10MHz频率的相对介电常数6.42,介电损耗1.1×10^(-3),热膨胀系数12.4×10^(-6)K^(-1),机械强度137 MPa。

CaO-B_(2)O_(3)-SiO_(2) glass ceramics with different Li_(2)O contents were prepared by high-temperature melting method.The effect of Li_(2)O on microstructure and properties of CaO-B_(2)O_(3)-SiO_(2) system were discussed.The results show that with the increase of Li_(2)O content,the bulk density,dielectric properties,thermal properties and mechanical properties of the sintered samples increase firstly and then deteriorate.By contrast,the material with 0.5mol%Li_(2)O and sintered at 875℃.exhibits better properties of bulk densityρ=2.55g·cm^(-1),ε=6.42,dielectric loss tanδ=1.1×10^(-3)(at 10 MHz),thermal expansion coefficient α=12.4×10^(-6)K^(-1),bend strengthσ=137 MPa..