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Reliability of alumina ceramics: Effect of grain siz

Seidel, Jürgen ; Claussen, Nils ; Rödel, Jürgen :
Reliability of alumina ceramics: Effect of grain siz.
[Online-Edition: http://dx.doi.org/10.1016/0955-2219(95)91430-V]
In: Journal of the European Ceramic Society, 15 (5) pp. 395-404.
[Artikel], (1995)

Offizielle URL: http://dx.doi.org/10.1016/0955-2219(95)91430-V

Kurzbeschreibung (Abstract)

The grain size dependence of fracture strength and Weibull modulus of alumina using a high purity, commercial starting powder was investigated. In the regime of an average grain size between 1.7 and 11 μm, fracture strength increases with decreasing grain size. This behaviour could be explained quantitatively by modelling the failure-causing defect as either a spherical pore or a hemispherical surface pit with a circumferential crack proportional to the average grain size. No dependence of Weibull modulus on average grain size and hence on R-curve behaviour could be observed. Theoretical considerations show that the closure stresses in alumina responsible for the R-curve behaviour are too low to affect the Weibull modulus.

Typ des Eintrags: Artikel
Erschienen: 1995
Autor(en): Seidel, Jürgen ; Claussen, Nils ; Rödel, Jürgen
Titel: Reliability of alumina ceramics: Effect of grain siz
Sprache: Englisch
Kurzbeschreibung (Abstract):

The grain size dependence of fracture strength and Weibull modulus of alumina using a high purity, commercial starting powder was investigated. In the regime of an average grain size between 1.7 and 11 μm, fracture strength increases with decreasing grain size. This behaviour could be explained quantitatively by modelling the failure-causing defect as either a spherical pore or a hemispherical surface pit with a circumferential crack proportional to the average grain size. No dependence of Weibull modulus on average grain size and hence on R-curve behaviour could be observed. Theoretical considerations show that the closure stresses in alumina responsible for the R-curve behaviour are too low to affect the Weibull modulus.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the European Ceramic Society
Band: 15
(Heft-)Nummer: 5
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
FB Materialwissenschaft (aufgegangen in FB11)
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 19 Nov 2008 15:58
Offizielle URL: http://dx.doi.org/10.1016/0955-2219(95)91430-V
ID-Nummer: 10.1016/0955-2219(95)91430-V
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