Objective To study the characteristics of thermal expansion of the aluminazirconia nanocomposite infiltrated ceramic.Methods The thermal expansion coefficients of aluminazirconia composite matrix, infiltrating glass and infiltrated ceramic were determined by various methods, respectively.Results The coefficients of thermal expansion of composite matrix with 10 wt%, 20 wt% and 30 wt% zirconia were 7 607, 7 690 and 8 111 μm/（m·℃） respectively. The thermal expansion coefficients of AZ8 and AZ10 infiltration glass were 6 867 and 7 333 μm/（m·℃）, respectively. The thermal expansion coefficient of infiltrated ceramic was 8 413 μm/（m·℃）.Conclusion The thermal expansion coefficients of the glass and composite matrix matched well. The thermal expansion coefficients of the aluminazirconia nanocomposite infiltrated ceramic and several common veneering porcelains matched well, too.
