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

W. Yi, X. Sun, D. Niu, X. Hu

Journal of Ceramic Science and Technology, Vol. 5, No. 1 (2014), pp. 45-50

DOI: 10.4416/JCST2013-00038

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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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