Al2O3-Reinforced Feldspar Ceramic Composite Material

This paper focused on the properties of Al(2)O(3)-rainforced feldspar dental ceramic. The results indicated that the introduced Al(2)O(3) could elevate the density of the sintered feldspar ceramic, where the relative density reached 97.9% under the conditions of 20 wt% Al(2)O(3) additive and 1200 degrees C. On the other hand, Al(2)O(3) additive could remarkably promote the machinability and the ultimate bending strength of the modified feldspar ceramic. The grinding efficiency increased by 260.1% if the content of Al(2)O(3) additive was 5 wt%, while the ultimate bending strength enhanced under increasing Al(2)O(3) additive content. The microstructure analysis revealed a composition of alpha-Al(2)O(3) as the dominant phase and crystalline calcium aluminum silicate hydrate as the minor phase in the Al(2)O(3)-rainforced feldspar ceramic. The feldspar represented totally as glass phase, wherein the Al(2)O(3) grains showed a homogenized dispersion.