Infire htc furnace

This study was designed in order to investigate the effect of pre-sintering temperature (1,400, 1,450 and 1,500 o C) to linear sintering shrinkage of fully crystallized Si3N4 ceramic comparing that of a commercial zirconia ceramic (inCoris ZI 40/19, Dentsply Sirona). To determine the linear sintering shrinkage, pre-sintered Si 3N4 ceramic and commercial zirconia rectangular bar specimens (n=10 for each sintering temperature level) were produced by using a high-speed cutting machine with 5×7×39 mm in dimension. Then, fully crystallizing Si 3N4 bar specimens using sintering temperature at 1,650 o C for 2 h in N 2 atmosphere. Fully crystallized commercial zirconias (inCoris ZI) were prepared by sintering process according to manufacturer's instruction by choosing program inCoris ZI (Dentsply Sirona inFire HTC furnace) (Table 1). The linear sintering shrinkage (%) was calculated from the difference in length, width and height between before and after sintering (measured with Mitutoyo calipers with a resolution of 0.05 mm) as following equation;
where ΔL, ΔW, ΔH: linear sintering shrinkage (%) L 0, W0, H0: the length, width and height of the specimen before sintering L, W, H: the length, width and height of the specimen after sintering