Subcritical crack growth behavior of AI2O3-Glass dental composites
article
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. © 2003 Wiley Periodicals, Inc.
Topics
Alumina-glass compositeDental ceramicsDynamic fatigueMechanical propertiesSubcritical crack growthCrack propagationDental compositesSubcritical crack growth (SCG)Biomedical engineeringComposite materialsDynamic fatigueMechanical propertyMechanical stressPhysical phenomenaSubcritical crack growthTooth prosthesisAluminum OxideBiocompatible MaterialsDental MaterialsDental Restoration FailureDental RestorationManufactured MaterialsMaterials TestingWeight-Bearing
TNO Identifier
237088
ISSN
00219304
Source
Journal of Biomedical Materials Research. Pt. B Applied Biomaterials, 65(2), pp. 233-238.
Pages
233-238
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