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Microstructure and dielectric properties of Ca-Al-B-Si-O glass/Al2O3 composites with various alkali oxides contents

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Abstract

The effects of alkali oxides (Na2O and K2O) addition on both the sintering behavior and dielectric properties of Ca-Al-B-Si-O glass/Al2O3 composites were investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results show that the increasing amount of alkali oxides in the glass causes the decrease of [SiO4], which results in the decrease of the continuity of glass network, and leads to the decrease of the softening temperature T f of the samples and the increasing trend of crystallization. And that deduces corresponding rise of densification, dielectric constant, dielectric loss of the low temperature co-fired ceramic (LTCC) materials and the decrease of its thermal conductivity. By contrast, the borosilicate glass/Al2O3 composites with 1.5% (mass fraction) alkali oxides sintered at 875 °C for 30 min exhibit better properties of a bulk density of 2.79 g/cm3, a porosity of 0.48%, a λ value of 2.28 W/(m·K), a ɛ r value of 7.82 and a tan δ value of 9.1×10−4 (measured at 10 MHz).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 210009, China

    Ming Liu  (刘明), Hong-qing Zhou  (周洪庆), Hai-kui Zhu  (朱海奎) & Jian-xin Zhao  (赵建新)

  2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China

    Hong-qing Zhou  (周洪庆)

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

    Zhen-xing Yue  (岳振星)

Authors
  1. Ming Liu  (刘明)
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  2. Hong-qing Zhou  (周洪庆)
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  3. Hai-kui Zhu  (朱海奎)
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  4. Zhen-xing Yue  (岳振星)
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  5. Jian-xin Zhao  (赵建新)
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Corresponding author

Correspondence to Hong-qing Zhou  (周洪庆).

Additional information

Foundation item: Project(2007AA03Z0455) supported by the National High Technology Research and Development Program (“863” Program) of China; Project(BE2010194) supported by Science & Technology Pillar Program of Jiangsu in China; Project(BE2009168) supported by Science & Technology Pillar Program of Jiangsu in China; Project supported by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions; Project(KF201103) supported by State Key Laboratory of New Ceramic and Fine Processing Tsinghua University; Project(CXZZ12_0415) supported by Innovation Foundation for Graduate Students of Jiangsu Province, China

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Liu, M., Zhou, Hq., Zhu, Hk. et al. Microstructure and dielectric properties of Ca-Al-B-Si-O glass/Al2O3 composites with various alkali oxides contents. J. Cent. South Univ. 19, 2733–2739 (2012). https://doi.org/10.1007/s11771-012-1334-5

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  • DOI: https://doi.org/10.1007/s11771-012-1334-5

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