摘要
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。
Anorthite-based glass-ceramics with different ratio of CaO and SiO2 were prepared by sintering method and the effect of glass composition on sintering and crystallization as well as properties of the CaO-Al2 O3-SiO2 system glass was investigated.The relationship between glass composition and properties was explored by using differential thermal analysis（DTA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） and property measurements.Results show that increasing the ratio of CaO and SiO2 decreases the glass transition temperature（Tg） and the crystallization peak temperature（Tp） as well as makes the crystallization exothermic peak sharpness.With the increase of the ratio of CaO and SiO2,the sintering temperature and the crystallization activation energy of the samples decrease,but the dielectric constant,dielectric loss and thermal coefficient of the samples increase.The effect of the ratio of CaO and SiO2 on crystallization behavior can be characterized by means of the crystallization kinetic parameters such as the crystallization activation energy（E） and the crystallization transition rate（k）.The prepared glass-ceramics exhibit low sintering temperature（≤1000 ℃）,moderate dielectric constant（≤7.5）,low dielectric loss（ 0.05%） and low thermal expansion coefficient（3.8 × 10-6-4.3 × 10-6 /℃）,which could be applicable for the low temperature co-fired ceramic substrate materials.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第5期30-35,共6页
Transactions of Materials and Heat Treatment
基金
广西自然科学基金(0339066)
广西信息材料重点实验室基金(桂科能0710908-01-Z)
关键词
氧化钙和二氧化硅比
钙长石
微晶玻璃
晶化动力学
烧结
性能
ratio of CaO and SiO2
anorthite
glass-ceramics
crystallization kinetics
sintering
properties
