Effect of Heat Treatment on GO/HA Bioactive Coating Deposited by Electrophoresis on Titanium Substrate

Abstract

Abstract: Graphene oxide (GO)/hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂, HA) composite coating was prepared on titanium substrate by electrophoretic deposition. GO/HA coatings obtained under different heat treatment conditions were characterized by XRD, SEM, and so on. The results indicate that heat treatment contributes to improve the crystallinity of HA. The HA in composite coating after heat treatment at 600 ℃ and 800 ℃ is not thermally decomposed, meanwhile, the ordered crystal structure of GO may be destroyed. GO/HA composite coatings haveexcellent bioactivity. However, the wettability and bioactivity of composite coatings are deteriorated with the increase of heat treatment temperature. In addition, the heat treatment process is beneficial to the compactness of GO/HA composite coatings and the bonding with the substrate. The adhesion strength of coating after heat treatment at 800 ℃ reaches 25.31 MPa.

Key words: heat treatment, hydroxyapatite, graphene oxide, electrophoretic deposition coating, titanium substrate, bioactivity

CLC Number:

TQ174

HAN Weiwei, LIU Li, YU Benrui, ZHU Qingxia. Effect of Heat Treatment on GO/HA Bioactive Coating Deposited by Electrophoresis on Titanium Substrate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2558-2563.

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