Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (12): 1309-1315.doi: 10.15541/jim20180102

• RESEARCH PAPER • Previous Articles     Next Articles

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

Jing-Jing QU1,2(), Xing WEI2, Fei LIU1(), Chang-Lai YUAN3, Guo-Hua CHEN3, Xian-Pei HUANG3   

  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 Online:2018-12-20 Published: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)

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

CLC Number: 

  • TM277