Wear characterization of different hydroxyapatite based coatings on Ti-6Al-4V titanium alloy by electrophoretic deposition

Subject Areas :

علیرضا عراقی ¹ ( دانشگاه شیراز )
محمد جعفر هادیانفرد ² ( عضو هیئت علمی دانشگاه شیراز بخش مهندسی مواد )

Received: 2016-08-23 Accepted : 2018-03-12 Published : 2018-02-20

Keywords: Electrophoretic, hydroxyapatite, Functionally graded, wear resistance,

Abstract :

In the present study, hydroxyapatite (HA) Single layer TiO2 single layer, HA-TiO2 double layer and functionally graded HA/TiO2 coatings were deposited on Ti-6Al-4V titanium alloy substrate by electrophoretic deposition technique (EPD). Impact resistance of coatings were measured by ball drop impact test and the results showed that the HA/TiO2 functionally graded coating has more impact resistance compare to HA single layer and HA-TiO2 double layer coatings. The wear resistance of coatings were investigated by pin on disc method. The normal load and sliding distance were 0.5 N and 50 m respectively and the worn surface was observed using scanning electron microscope (SEM) and analyzed by ImageJ software. The results showed that the HA/TiO2 functionally graded coating has more wear resistance compare to HA single layer. Additionally, investigation of worn surface of coatings showed that all of the coatings have abrasive mechanism but wear mechanism for functionally graded coating, changed and delamination was added to abrasive mechanism.

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