以珍珠岩为主要原料制备了单相α-堇青石微晶玻璃.采用DSC、XRD及FESEM分别研究了微晶玻璃的烧结和晶化行为、晶相组成及显微结构.探讨了烧结温度和SiO2含量对微晶玻璃晶相、显微结构及性能的影响.结果表明,随着烧结温度升高,微晶玻璃中μ-堇青石逐渐减少并转变成α-堇青石,微晶玻璃的孔隙率减少.随着SiO2含量升高,α-堇青石晶相析出温度先降低后增高,微晶玻璃的密度及抗折强度先增大后减小,介电性能变差.当Mg∶Al∶Si=2∶2∶5.95时经900 ℃烧结6 h制得单一α-堇青石微晶玻璃,并具有高抗折强度(116 MPa),低介电常数(5.72,10 MHz),低介电损耗(0.0059,10 MHz),与Si相匹配的热膨胀系数(2.91×10-6 K-1),可以用作低温共烧陶瓷材料.
Single α-cordierite glass-ceramics were prepared successfully from perlite as the basic raw material.The effects of sintering temperature and SiO2 contents on the crystallization behavior,crystal phase composition,microstructure and property of the glass-ceramics were characterized by differential scanning calorimetry (DSC),X-ray diffractometer (XRD) and field emission scanning electron microscope (FESEM).The results show that μ-cordierite phase gradually decreases and finally transformed into α-cordierite, and the porosity reduces in the glass-ceramics with sintering temperature increasing.As SiO2 contents increases, the precipitation temperature of α-cordierite firstly reduces and then increases, and the density and the flexural strength of the glass-ceramics increase first and then decrease, and its dielectric properties are deteriorated.The single α-cordierite glass-ceramics were achieved from the glass with composition of Mg∶Al∶Si=2∶2∶5.95 sintered at 900 ℃ for 6 h.The as-synthesized glass-ceramics possessed high flexural strength (116 MPa), low dielectric constants (5.72, 10 MHz), low dielectric losses (0.0059, 10 MHz), and matchable coefficient of thermal expansion (2.91×10-6 K-1,very close to Si), which can be used as a potential low temperature co-fired ceramics (LTCC) substrate materials.
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