[Research on bending strength and fracture toughness of alumina-glass composite].
To develop a new ceramic material that can be machined and infiltrated with glass, a porous alumina blank sintered at 1350 degrees C was made of high purity, super fine alpha-alumina and then infiltrated with glass in this study. The density, bending strength and fracture toughness of the partially sintered alumina and alumina-glass composite were determined. The results indicated that the porous alumina density was 2.12 g/cm3, the three point bending strength 102 MPa, the fracture toughness 1.61 MPam1/2; that the alumina-glass composite density was 3.85 g/cm3, the three point bending strength 385 MPa, and the fracture toughness 4.05 MPam1/2. By SEM and EDXA analysis, lanthanum boroslicate glass was completely infiltrated into the 3 mm thick porous alumina blank for 6 h at 1150 degrees C. These suggest that the new developed alumina blank is suited for clinical use.
Luo
X
X
Department of Prosthodontics, School of Stomatology, Chengdu.
Zhao
Y
Y
Tian
J
J
Chao
Y
Y
Zhang
S
S
Zhang
Y
Y
D000537:Aluminum Oxide; D002516:Ceramics; D003764:Dental Materials; D005898:Glass; D013718:Tensile Strength
D003764:Dental Materials; D000537:Aluminum Oxide