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Sintering characteristics, microstructures and dielectric properties of borosilicate-based glass/alpha-Al2O3 composites for LTCC application with different MgO and Na2O contents

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Abstract

The sintering characteristics, microstructures and dielectric properties of Ca–B–Si–O glass/alpha-Al2O3 materials at different MgO and Na2O contents were studied. The addition of MgO and Na2O in glass could regulate and manage the glass softening and crystallization, and further improved the sintering characteristics and dielectric properties of Ca–B–Si–O/Al2O3 glass + ceramic composites. The bulk density, thermal conductivity and dielectric constant curves elevated from 0 to 2 wt% at MgO and Na2O content, and then declined with the further increase of MgO and Na2O content, while the dielectric loss curve exhibited the converse varying trend. Phases and microstructures analysis showed that Ca–B–Si–O/Al2O3 glass + ceramic composites with 2 wt% MgO and Na2O content were composed of glass with amorphous structure, pores, crystalline phases of alpha-Al2O3 and CaAl2SiO8 with the triclinic unit cell that was formed by the typical chemical reaction of Ca2+, Al3+, Si4+, O2− ions in the glass. By contrast, Ca–B–Si–O /Al2O3 glass + ceramic composites with 2 wt% MgO and Na2O content at 850 °C exhibited better properties of ρ = 3.06 g/cm3, λ = 3.23 W/m K, εr = 7.82 (at 7 GHz), tan δ = 1.3 × 10− 3 (at 7 GHz), and a well chemical and co-fired compatibility between glass + ceramic composites and Ag electrodes.

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Acknowledgements

We would like to thank National Natural Science Foundation of China (Grant U1304520), Science and Technology Program of Henan Province (162102210280), National Science and Technology Innovation Program of Building Materials Industry (2015-M2-1), Natural Science Research Project of the Education Department of Henan Province (15A430035), National Innovation and Entrepreneurship Training Program for College Students(201911070001).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang, 471023, Henan, China

    Ming Liu, **aoying Xu & Ziqi An

  2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nan**g Tech University, Nan**g, 210009, China

    Hongqing Zhou

  3. State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Bei**g, 100084, China

    Zhenxing Yue

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  1. Ming Liu
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  2. **aoying Xu
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Correspondence to Ming Liu.

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Liu, M., Xu, X., Zhou, H. et al. Sintering characteristics, microstructures and dielectric properties of borosilicate-based glass/alpha-Al2O3 composites for LTCC application with different MgO and Na2O contents. J Mater Sci: Mater Electron 31, 11195–11203 (2020). https://doi.org/10.1007/s10854-020-03667-2

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  • DOI: https://doi.org/10.1007/s10854-020-03667-2

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