2003
DOI: 10.1016/s0955-2219(02)00072-9
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Subcritical crack growth in Al2O3 with submicron grain size

Abstract: Gelcast sintered a-Al 2 O 3 (corundum) ceramics were developed with a sub-mm grain size at densities > 99%. Highly perfect samples with a minimum of flaws were prepared by an approach that maintains the high purity of the raw powder > 99.99% Al 2 O 3 throughout processing. As a consequence, all grain boundaries are free of even thinnest amorphous interface films, amorphous triple junctions are 4150 nm, and their frequency is low. Subcritical crack growth was investigated by an approach recording growth rates a… Show more

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Cited by 31 publications
(25 citation statements)
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“…This is due to higher strength and especially much lower SCG sensitivity, associated with both studied variants of this material and stemming from the essential absence of glassy phase. ZTA is preferred over glass-free Al 2 O 3 [25] due to its higher strength brought about by the ZrO 2 reinforcing phase, and ZTA nanocomposites were found to outperform both Al 2 O 3 and YSZ in static fatigue resistance [26].…”
Section: Discussionmentioning
confidence: 99%
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“…This is due to higher strength and especially much lower SCG sensitivity, associated with both studied variants of this material and stemming from the essential absence of glassy phase. ZTA is preferred over glass-free Al 2 O 3 [25] due to its higher strength brought about by the ZrO 2 reinforcing phase, and ZTA nanocomposites were found to outperform both Al 2 O 3 and YSZ in static fatigue resistance [26].…”
Section: Discussionmentioning
confidence: 99%
“…Accordingly, we also obtained good results with YSZ beams (σ 0 = 953 MPa; ∆ = 2.0%; n = 107; σ d = 640 MPa) [21]. Better stress corrosion resistance could also be obtained with alumina by employing higher purity, but the processing is more involved [25], and the strength remains lower than that of ZTA. These results essentially agree with other work [26].…”
Section: Blank Beams (V00)mentioning
confidence: 91%
“…Since the SCG rate in Region II is a constant (v T ), all crack trajectories on the graph within Region II, and hence in the area situated between the two homothetic curves described by Eqs. (4) and (5), are straight lines of identical slope…”
Section: Problem Formulation: Short Straight-through Cracksmentioning
confidence: 96%
“…(i) we neglect the sub-threshold region, and thus take K 0 = 0 because crack growth rates are negligible in this regime of low stress intensity factors [5]; (ii) we take the crack growth rate in Region II to be a constant, v T ; (iii) we simplify the steeply rising dependence of v on K in Region III by considering the crack propagation transition between Region II and Region III to be sharp. We do so because this transition is, generally, quite steep.…”
Section: Problem Formulation: Short Straight-through Cracksmentioning
confidence: 99%
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