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Subcritical crack growth behavior of Al 2 O 3 ‐glass dental composites
Author(s) -
Zhu Qingshan,
With Gijsbertus de,
Dortmans Leonardus J. M. G.,
Feenstra Frits
Publication year - 2003
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.10007
Subject(s) - materials science , composite material , composite number , porosity , glass microsphere , glass fiber , chemical engineering , microsphere , engineering
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. J Biomed Mater Res Part B: Appl Biomater 65B: 233–238, 2003