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Preparation of glass-ceramics in the MgO-Al₂O₃-SiO₂ system via low-Temperature combustion synthesis technique

Y. He¹, J. M. Guo², G. W. Zhang¹, X. L. Chen¹, J. C. Zhang¹, Z. L. Huang¹, G. Y. Liu¹, Q. Cai¹

¹ School of Science, Honghe University, Mengzi 661100, China
² Joint Research Centre for International Cross-border Ethnic area Biomass Clean Utilization in Yunnan Province, Yunnan Minzu University, Kunming 650500, China

received January 13, 2015, received in revised form February 12, 2015, accepted March 10, 2015

Vol. 6, No. 3, Pages 201-206   DOI: 10.4416/JCST2015-00004

Abstract

MgO-Al₂O₃-SiO₂ (MAS) glass powders have been successfully synthesized by means of the low-temperature combustion technique using magnesium nitrate, aluminium nitrate and silicic acid as raw materials, and urea as fuel. The sintering behavior, crystallization process and dielectric properties of the MAS were investigated with DCS, XRD, TMA and SEM techniques. The results indicate that the sintering temperature of the as-prepared glass powders decreased with the addition of B₂O₃ and only α-cordierite was precipitated as a main crystal phase, i.e. without μ-cordierite, for the glass powders heated at 1000 °C. Moreover, the as-prepared α-cordierite exhibited a dense microstructure, the additive (B₂O₃ 2.5 %) reducing the crystallization temperature of α-cordierite phase from 1050 °C to 900 °C. The obtained cordier­ite-based glass-ceramics (sintered at 950 °C and 1000 °C) have a low dielectric constant (4.00 ∼ 4.03 at 1 MHz), a low dielectric dissipation factor (≈ 0.003) and high sintering density (which is up to 98 % of the theoretical density). The properties of as-prepared MAS satisfy all requirements of a material for electronic packaging, making it a promising candidate for application as electronic packaging.

Keywords

Cordierite-based glass ceramics, low-temperature combustion synthesis, crystallization process, sintering behavior, electronic packaging

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