Effects of Tempering Time on Phase Formation and Microstructural Evolution of Zirconia Modified-Dental Porcelain Ceramics
Chayada Sanitnapapong [a], Attavit Pisitanusorn [a], and Supon Ananta*[b]* Author for corresponding; e-mail address: supon@chiangmai.ac.th
Volume: Vol.38 No.2 (APRIL 2011)
Research Article
DOI:
Received: 1 November 2010, Revised: -, Accepted: 8 March 2011, Published: -
Citation: Sanitnapapong C., Pisitanusorn A. and Ananta S., Effects of Tempering Time on Phase Formation and Microstructural Evolution of Zirconia Modified-Dental Porcelain Ceramics, Chiang Mai Journal of Science, 2011; 38(2): 176-186.
Abstract
Dental porcelain ceramics reinforced with leucite nanocrystallines were successfully fabricated by using the two-step sintering technique together with some ZrO2 additive. Influence of firing conditions on leucite formation, densification and microstructural development of the sintered samples was investigated. It has been found that the choice of tempering time is one of the key factors controlling leucite crystallization on the zirconia surface in dental porcelain ceramics. The potentiality of a two-step sintering technique and Zr additive as a simple ceramic fabrication method to obtain highly dense dental porcelain ceramic-nanocomposites was demonstrated. After a two-step sintering, it was found that the microstructure was mainly composed of a dispersed dendritic leucite crystalline and a glassy matrix. Keywords: composite; dental porcelain ceramics; leucite; tempering time.