无机材料学报 ›› 2018, Vol. 33 ›› Issue (12): 1309-1315.DOI: 10.15541/jim20180102 CSTR: 32189.14.10.15541/jim20180102

• 研究论文 • 上一篇    下一篇

热处理对Mg-Al-Si-Ti-B系微晶玻璃析晶及介电性能的影响

屈婧婧1,2, 魏星2, 刘飞1, 袁昌来3, 陈国华3, 黄先培3   

  1. 1. 桂林电子科技大学 机电工程学院, 桂林 541004;
    2. 桂林航天工业学院 科技处, 桂林 541004;
    3. 桂林电子科技大学 广西信息材料重点实验室, 桂林 541004
  • 收稿日期:2018-03-06 修回日期:2018-06-08 出版日期:2018-12-20 网络出版日期:2018-11-27
  • 作者简介:屈婧婧(1988-), 女, 博士研究生, 讲师. E-mail: qujingjing@guat.edu.cn
  • 基金资助:
    广西自然科学基金(2017GXNSFBA198093);国家自然科学基金(11464006)

Heat-treatment on Crystallization and Dielecty Property of Mg-Al-Si-Ti-B Glass-ceramics

QU Jing-Jing1,2, WEI Xing2, LIU Fei1, YUAN Chang-Lai3, CHEN Guo-Hua3, HUANG Xian-Pei3   

  1. 1. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
    2. Department of Science and technology, Guilin University of Aerospace Technology, Guilin 541004, China;
    3. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
  • Received:2018-03-06 Revised:2018-06-08 Published:2018-12-20 Online:2018-11-27
  • About author:QU Jing-Jing. E-mail: qujingjing@guat.edu.cn
  • Supported by:
    Natural Science Foundation of Guangxi (2017GXNSFBA198093);National Natural Science Foundation of China (11464006)

摘要:

采用差热分析仪(DSC), X射线衍射仪(XRD)及扫描电子显微镜(SEM)等测试手段, 研究了不同烧结制度下19MgO-23Al2O3-53SiO2-4TiO2-2.5B2O3(wt%, M-A-S-T-B)系微晶玻璃样品的析晶过程、相成分与含量及微观形貌, 并分析了核化与晶化时间对材料微波介电性能的影响关系。结果表明, 根据玻璃受控析晶机制, 当热处理制度为850℃/2 h+950℃/2 h时, 斜顽辉石(MgSiO3)相得以较好的析出, 且伴随有α-堇青石(Mg2Al4Si5O18)、镁铝硅酸盐(xMgO-yAl2O3-zSiO2)和方石英(α-SiO2)相的析出。随着核化时间的延长, M-A-S-T-B体系各晶相种类及析出量变化不明显; 而随着晶化时间的延长(20 h), 材料的晶化程度提高, 品质因数(Q×f)得以提升, 颗粒状晶粒析出趋于显著; 但当晶化时间进一步延长至30 h时, 样品致密度降低, 介电损耗略有增大。在热处理制度为850℃/2 h+950℃/20 h下, 样品获得的微波介电性能较优: εr=3.85、τf ≈-5.37×10-6/℃和Q×f ≈12740 GHz(f0=13.973 GHz)。

 

关键词: 热处理, 微晶玻璃, MgSiO3, 微波介电性能

Abstract:

Effects of different heat-treatment process on the crystallization, phase composition and content, and microstructure of 19MgO-23Al2O3-53SiO2-4TiO2-2.5B2O3 (wt%, M-A-S-T-B) were studied by means of differential scanning calorimeter (DSC), X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques. The influence of different nucleation and crystallization time on the microwave dielectric properties were discussed as well. The results showed that, based on the controlled crystallization mechanism of glass, MgSiO3 phase was precipitated adequately for M-A-S-T-B samples heat-treated at 850℃/2 h + 950℃/2 h, and also, the α-cordierite, xMgO-yAl2O3-zSiO2 and α-SiO2 phases could be precipitated from matrix phase. Additionally, with the increase of nucleation time, types of crystalline and phase content were found no discernible changes in the M-A-S-T-B glass-ceramics. While crystallization time increased to 20 h, the crystallized volume fraction of the glass increased, leading to the improvement of the quality factor (Q×f) and the obvious precipitation of granular grains. However, the dielectric loss slightly increased and the relative density of specimens decreased with further increase of crystallization time (30 h). Wherein, the M-A-S-T-B glass-ceramic sample heat-treated at 850℃/2 h + 950℃/20 h exhibited the excellent microwave dielectric properties of εr ~ 3.85, Q×f ~ 12740 GHz (at 13.973 GHz) and τf ~-5.37×10-6/℃.

Key words: heat-treatment, glass-ceramics, MgSiO3, microwave dielectric properties

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