The object of this research was to find the influence of zirconia's phase transformation on the junction between zirconia/alumina ceramics and commercial coating-glass. Effect of phase transformation was observed through coefficient curves of thermal expansion in four kinds of zirconia/alumina composites: pure zirconia, zirconia toughened alumina, alumina toughened zirconia, pure alumina. Energy spectrum analysis, optical and electron scanning microscope were observed on the junction of zirconia/alumina ceramics with coating glass. Furthermore, pre-sintering process was executed to find the heat softening point of the coating-glass. Through experiments, we find phase transformation was only observed in the pure zirconia group. There is no obvious effect of phase transformation in the other three groups. Therefore, we can conclude that adding alumina into pure zirconia may restrict the transformation of zirconia particles and result in the decrease even the disappearance of transformation phenomenon. Therefore, VITA alpha coating glass is a kind of adoptable bio-glass matching with zirconia and zirconia composites. In the mean time, thermal expansion coefficient of two matching materials should also be considered.

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1. Experimental investigation and crystal-field modeling of Er³⁺ energy levels in GSGG crystal
2. Microstructure analysis on the interface between zirconia/alumina composites and bio-coating glass