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Effect of Gradient Layer of TiO2- HA on Properties of the Ha Coated Ti-6Al-4V
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Effect of Gradient Layer of TiO2- HA on Properties of the Ha Coated Ti-6Al-4V

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Abstract:

The use of hydroxyapatite (HA) coating on metallic implants has always been a challenge due to a discrepancy between ceramic coating and metallic substrate properties. In this study, functionally graded TiO2-HA coating (FGC TiO2-HA), with bottom-up composition: 100% TiO2, 50% TiO2 -50% HA, 100% HA, produced by sol-gel method on the Ti-6Al-4V alloy substrate. The XRD, FTIR and DSC results signified desired phase achievement. The quality assessment and scratch resistance of FGC TiO2-HA in comparison with control samples (single-layer HA and double-layer TiO2-HA coatings) were assessed by SEM and FESEM images and nanoscratch test. According to the tests outcomes, The TiO2 intermediate layer increases the HA coating’s strength (22%) and surface hardness, while gradient layer of TiO2-HA improves (14%) this consequence by progressing the coating integrity.

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Periodical:

Defect and Diffusion Forum (Volume 400)

Pages:

193-200

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.400.193

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Online since:

March 2020

Authors:

Rezvan Azari, Hamid Reza Rezaie*, Alireza Khavandi, Elham Malek Mohammadi

Keywords:

Coating, Gradient Layer, HA, Scratch Resistance, Strength, TiO2

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© 2020 Trans Tech Publications Ltd. All Rights Reserved

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