Reliability Evaluation of Hydrothermal Crystallization on Plasma-Sprayed HA Coatings by the Weibull Model

Abstract:

Plasma-sprayed HA coatings (HACs) on Ti-6Al-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.

• Periodical: Key Engineering Materials (Volumes 345-346)
• Pages: 1389-1392
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.345-346.1389
• Online since: August 2007
• Authors: Chung Wei Yang, Truan Sheng Lui
• Keywords: Bonding Strength, Hydrothermal Treatment, Hydroxyapatite (HAP), Nanocrystalline, Plasma Spraying, Reliability, Weibull Analysis

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