Research on Alumina Modified Feldspathic Dental Ceramics

Alumina modified feldspathic dental ceramics were fabricated by common sintering method,using alu-mina as an additive to strengthen and toughen the feldspathic ceramics.The prescription and the sintering technol-ogy of the feldspathic ceramics composite materials were identified.The influences of sintering technology on the machinability,the microhardness and the flexural strength were discussed.The feldspathic ceramics composite ma-terials were characterized by XRD and SEM.The results reveal that the sintering temperature of feldspathic ceram-ics is raised with the increase of alumina content.Where the relative density of the feld spathic ceramics added with 20wt% Al2O3 reach 97.9% after sintered at 1200℃.Furthermore,the property of feldspathic ceramics is improved obviously with the addition of alumina.The abrasion rate reaches the maximum with the addition of 5wt% alumina,the microhardness is increased by 26.9% with addition of 20wt% Al2O3,and the flexural strength is increased with the increase of alumina content.