[Effects of alumina particle-size on mechanical properties of alumina-glass composite].
OBJECTIVE
To study the effects of alumina particle-size on mechanical properties of alumina-glass composite.


METHODS
Alumina compacts were prepared by isostatic press method and sintered at 1400 degrees C for 2 hours with two various particle-size alumina. Alumina-glass composite was made by infiltrating partially sintered porous alumina with glass at 1200 degrees C for 4 hours.


RESULTS
The strength and fracture toughness of nanometre alumina-glass composite were 358.2 MPa, 2.38 MPam1/2 respectively. The strength and fracture toughness of micrometer alumina-glass composite were 432.2 MPa, 5.12 MPam1/2 respectively. Image analysis of SEM micrograph showed that porous rate was about 11.5% in the nanometer alumina-glass composite, 1.2% in the micrometer alumina-glass composite, and there was more glass composition in the nanometer alumina-glass composite than that in the micrometer alumina-glass composite.


CONCLUSIONS
The alumina volume percentage and porous rate play an important role in the strength and fracture toughness of alumina-glass composite.
Luo
X
X
College of Stomatology, West China University of Medical Sciences.
Zhao
Y
Y
Chao
Y
Y
Tian
J
J
Zhang
Y
Y
Zhang
S
S
D000537:Aluminum Oxide / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D010316:Particle Size; D018583:Pliability; D013718:Tensile Strength
D003776:Dental Porcelain; D000537:Aluminum Oxide