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Characteristics of Micro-Gold-Particle/Glass-Ceramic Composite from Post-Sintering Thermal Treatment

W. Yi¹, X. Sun¹, D. Niu², X. Hu³

¹ Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
² School of Science, Northeastern University, Shenyang 110819, China
³ School of Mechanical and Chemical Engineering, The University of Western Australia, Perth 6009, Australia

received November 9, 2013, received in revised form January 1, 2014, accepted February 15, 2014

Vol. 5, No. 1, Pages 45-50   DOI: 10.4416/JCST2013-00038

Abstract

Microstructural characteristics of a gold-particle (GP)-reinforced glass-ceramic (GC) composite at the GP/GC interface were investigated before and after heat treatment at 900, 1100 and 1300 °C. The interfacial regions between the GP and GC exposed on the fracture surface and relevant chemical reactions were examined. The as-processed GC matrix had a nano-scaled biphasic microstructure, with isolated amorphous leucite phase evenly distributed in the continuous feldspar matrix. After the GP/GC composite was heated at 900 °C, the amorphous leucite phases were transformed into leucite crystalline phases. Au₂Si and Au₅Si₂ found at the GP/GC interface proved that chemical reactions had indeed occurred during composite processing. Fracture surface features around the GP and GP/GC interface were further examined after heat treatment at 1100 °C and 1300 °C, showing new compounds were produced during the process. Characterization techniques, including X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM), incorporating X-ray microanalysis using Energy-Dispersive Spectrometry (EDS), were employed to study the GP/GC interface.

Keywords

Gold particle, glass-ceramic, interface, thermal treatment, chemical reactions

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