Effect of Acidic Environment on Subcritical Crack Growth in Alumina Ceramics

Баринов, С. М.; Fateeva, L. V.; Ivanov, N. V.; Орлов, С. В.; Shevchenko, V.Ja.

doi:10.1016/s1359-6462(97)00561-7

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…For LSFCO materials, there was no slow crack growth study reported in the literature. As a reference, our n value is substantially lower than those of reported high‐purity dense alumina ( n ∼60) 24–26 . It is reasonable to suspect that surface defects and pores of the LSFCO are responsible for the low n value as cracks initiated from the surface and propagated preferentially along the weakest interfaces that are influenced by the residual stresses.…”

Section: Discussionmentioning

confidence: 52%

Subcritical Crack Growth Behavior of A Perovskite‐Type Oxygen Transport Ceramic Membrane

Nagabhushana

Nithyanantham

Bandopadhyay

et al. 2011

Int J Applied Ceramic Tech

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We herein report subcritical crack growth (SCG) studies of La 0.2 Sr 0.8 Fe 0.8 Cr 0.2 O 3Àd (LSFCO) perovskite membranes as oxygen transport membranes (OTM). Two sample batches of perovskite were tested to investigate the effect of temperature, specific chemical environments, and loading rate on flexure strengths, using four-point bend tests. The first batch was examined at room temperature in air. The second batch was soaked in an N 2 /air atmosphere at 10001C. Stress rates varied approximately from 0.2 to 90 MPa/s. The strength-probability-time diagram is constructed for design proposes. Flexural strength data indicate that the examined OTM material showed little susceptibility to SCG at room temperature in air. However, the sample is susceptible to SCG in an N 2 /air environment at 10001C. Also, the experiments demonstrate flexuralstrength rate dependency, with strength increasing with the stress rate. The observed phenomena are explained by the decomposition and microstructural transitions in the perovskite.

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Section: Discussionmentioning

confidence: 52%

Subcritical Crack Growth Behavior of A Perovskite‐Type Oxygen Transport Ceramic Membrane

Nagabhushana

Nithyanantham

Bandopadhyay

et al. 2011

Int J Applied Ceramic Tech

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“…23 This fluoride-related alumina damage could be more pronounced and exaggerated with the utilization of APF, acidic fluoride agent, for 8 hours. [31][32][33][34] In the present study the fracture site was located either in the sliding ligature cap or at the ears of the brackets. The results of FL were in harmony with those of Ra.…”

Section: Discussionmentioning

confidence: 99%

“…This could be explained by immersion of brackets in acidic environment (APF) for long period (8hours) could lead to dramatic surface flaws and significant increase in alumina crack growth. 31,34 Crack or imperfections allow for local concentration of the stresses and ceramic bracket fracture. [22][23][24] However, as with any in vitro investigation, the protocol can not exactly simulate clinical situations.…”

Section: Discussionmentioning

confidence: 99%

Effect of fluoride prophylactic agents on ceramic self ligating brackets

Abdelnaby

Taha

2011

Egyptian Orthodontic Journal

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“…Because acidic environments cause increased alumina crack growth as compared with crack growth in water, 32 it was expected that there might be more fluoride-related alumina damage with an acidic fluoride agent. However, the monocrystalline bracket exhibited similar decreases in fracture strength with both the neutral and APF agents.…”

Section: Discussionmentioning

confidence: 99%