为探索玻璃组成对CaO-Al2O3-SiO2系玻璃烧结、晶化和性能的影响,采用烧结法制备了不同组成的钙长石基微晶玻璃.通过差热分析(DTA)、X射线衍射(XRD)、扫描电镜(SEM)和性能测试研究玻璃组成和性能之间的关系.结果表明:随CaO和SiO2含量比值增加,玻璃转变温度和析晶放热峰温度逐渐降低,且析晶放热峰变得尖锐.增加CaO和SiO2比降低了玻璃的析晶活化能和烧结温度,但增加了样品的介电常数、介电损耗和热膨胀系数.析晶活化能E和析晶转变速率k都能适于表征CaO/SiO2比对玻璃析晶性能的影响.所制备的微晶玻璃具有低烧结温度(≤1000℃)、适中介电常数(≤7.5)、低介电损耗(≤0.05%)和低热膨胀系数(≤4.3×10-6/℃),有望用于低温共烧陶瓷基板材料.
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