珍珠岩制备单一α-堇青石微晶玻璃及其性能

发布时间：2018-02-24 23:19

  本文关键词： 珍珠岩 α-堇青石 微晶玻璃 介电性能 低温共烧陶瓷　出处：《硅酸盐通报》2017年03期 　论文类型：期刊论文

【摘要】：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SiO_2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SiO_2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。
[Abstract]:Single phase 伪 -cordierite glass-ceramics were prepared from perlite. The sintering and crystallization behavior, phase composition and microstructure of glass-ceramics were studied by DSC-XRD and FESEM, respectively. The effects of sintering temperature and SiO_2 content on glass-ceramics were investigated. The results show that with the increase of sintering temperature, the 渭 -cordierite in glass-ceramics decreases and changes into 伪 -cordierite. With the increase of SiO_2 content, the precipitation temperature of 伪 -cordierite phase decreases first and then increases, and the density and flexural strength of glass-ceramics increase first and then decrease. When Mg:Al:Si=2:2:5.95 was sintered at 900 鈩，

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