Subcritical crack growth behavior of Al2O3-glass dental composites.
The purpose of this study is to investigate the subcritical crack growth (SCG) behavior of alumina-glass dental composites. Alumina-glass composites were fabricated by infiltrating molten glass to porous alumina preforms. Rectangular bars of the composite were subject to dynamic loading in air, with stressing rates ranging from 0.01 MPa/s to 2 MPa/s. The SCG parameter n was determined to be 22.1 for the composite, which is substantially lower than those of high-purity dense alumina. Investigations showed that glass phases are responsible for the low n value as cracks propagate preferentially within glass phases or along the interface between glass phases and alumina phases, due to the fact that glasses are more vulnerable to chemical attacks by water molecules under stress corrosion conditions. The SCG behavior of the infiltration glass was also investigated and the SCG parameter n was determined to be 18.7.
Zhu
Qingshan
Q
Multiphase Reaction Lab, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100080, China. qzhu@home.ipe.ac.cn
de With
Gijsbertus
G
Dortmans
Leonardus J M G
LJ
Feenstra
Frits
F
D000537:Aluminum Oxide / Q000737:chemistry*; D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D005898:Glass / Q000737:chemistry*; D008420:Manufactured Materials; D008422:Materials Testing / Q000379:methods*; D044367:Phase Transition; D013314:Stress, Mechanical; D016474:Weight-Bearing
D001672:Biocompatible Materials; D003764:Dental Materials; D000537:Aluminum Oxide