Reliability evaluation of hydrothermal crystallization on plasma-sprayed HA coatings by the weibull model

Chung Wei Yang, Truan-Sheng Lui

Research output: Contribution to journalArticle

Abstract

Plasma-sprayed HA coatings (HACs) on T1-6A1-4V substrates with post-heat treatments were employed to improve the microstructural homogeneity, bonding strength and reliability of the HACs. A defect-healing effect can be recognized to diminish coating defects with the hydrothermal treatment, and 150°C hydrothermally-treated HACs shows a significant improved bonding strength than 600°C vacuum heating HACs because of its dense structure from the defect-healing effect. Low-temperature hydrothermal treatment demonstrates a more superior crystallization effect than vacuum heat treatment. Based on the statistical calculation by the Weibull distribution function, hydrothermally-treated HACs show a wear-out failure with a higher Weibull modulus than vacuum heating HACs. Hydrothermally-treated HACs possessed better reliability can be attributed to the suppression of defect content (about 2.6-3.2 volume %) and its smaller strength data fluctuation.

Original languageEnglish
Pages (from-to)1389-1392
Number of pages4
JournalKey Engineering Materials
Volume345-346 II
Publication statusPublished - 2007

Fingerprint

Sprayed coatings
Crystallization
Plasmas
Coatings
Defects
Vacuum
Heat treatment
Heating
Weibull distribution
Distribution functions
Wear of materials
Substrates

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

Cite this

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abstract = "Plasma-sprayed HA coatings (HACs) on T1-6A1-4V substrates with post-heat treatments were employed to improve the microstructural homogeneity, bonding strength and reliability of the HACs. A defect-healing effect can be recognized to diminish coating defects with the hydrothermal treatment, and 150°C hydrothermally-treated HACs shows a significant improved bonding strength than 600°C vacuum heating HACs because of its dense structure from the defect-healing effect. Low-temperature hydrothermal treatment demonstrates a more superior crystallization effect than vacuum heat treatment. Based on the statistical calculation by the Weibull distribution function, hydrothermally-treated HACs show a wear-out failure with a higher Weibull modulus than vacuum heating HACs. Hydrothermally-treated HACs possessed better reliability can be attributed to the suppression of defect content (about 2.6-3.2 volume {\%}) and its smaller strength data fluctuation.",
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Reliability evaluation of hydrothermal crystallization on plasma-sprayed HA coatings by the weibull model. / Yang, Chung Wei; Lui, Truan-Sheng.

In: Key Engineering Materials, Vol. 345-346 II, 2007, p. 1389-1392.

Research output: Contribution to journalArticle

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