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Nanoscaled Interface Between Microgold Particles and Biphase Glass-Ceramic Matrix

Authors

  • Wei Yi,

    1. School of Mechanical and Chemical Engineering, The University of Western Australia, Perth, Western Australia, Australia
    2. School of Dentistry, The University of Western Australia, Perth, Western Australia, Australia
    3. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, China
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  • Xiaozhi Hu,

    Corresponding author
    1. School of Mechanical and Chemical Engineering, The University of Western Australia, Perth, Western Australia, Australia
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  • Paul Ichim,

    1. School of Dentistry, The University of Western Australia, Perth, Western Australia, Australia
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  • Xudong Sun

    1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, China
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Abstract

This article presents a detailed study on the nanoscaled interface between microelongated gold particles (GP) and biphase leucite/feldspar glass-ceramic matrix. The glass-ceramic composite with a nonuniform GP distribution was processed through hot-pressing under vacuum using a commercial dental ceramic furnace for glass-ceramic dental crown manufacturing. Heat treatments at 900°C, 1100°C, and 1300°C were conducted, and microstructural features along the interface were used to verify the chemical reactions between GP and glass-ceramic matrix. It was observed that the amorphous glass-ceramic matrix had nanoscaled biphase structures, and the distributed nanoscaled amorphous leucite phase was attracted to GP during hot-pressing, and was more reactive with GP than the feldspar phase. The thickness of the interfacial phase formed through chemical reactions between GP and glass-ceramic matrix is around 30 nm. The chemically bonded interface has contributed significantly toward the substantial improvements in both strength and toughness of the GP-reinforced glass-ceramic matrix composite. Characterization techniques, including X-ray diffraction and field-emission scanning electron Microscopy, incorporating X-ray microanalysis using energy dispersive spectrometry, have been employed in this study.

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