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Nanoscaled Interface Between Microgold Particles and Biphase Glass‐Ceramic Matrix
Author(s) -
Yi Wei,
Hu Xiaozhi,
Ichim Paul,
Sun Xudong
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12581
Subject(s) - materials science , leucite , ceramic , glass ceramic , composite material , amorphous solid , hot pressing , composite number , scanning electron microscope , phase (matter) , ceramic matrix composite , chemistry , organic chemistry
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.