脉冲电沉积法在阳极氧化钛上制备氧化石墨烯/磷酸钙涂层：生物腐蚀性和机械性能。

Development of graphene oxide/calcium phosphate coating by pulse electrodeposition on anodized titanium: Biocorrosion and mechanical behavior.

机构信息

Department of Materials Science Engineering, University of Bonab, 5551761167 Bonab, Iran.

Research Center for Advanced Materials, Faculty of Materials Engineering, Sahand University of Technology, 5133511996 Tabriz, Iran.

出版信息

J Mech Behav Biomed Mater. 2019 Feb;90:575-586. doi: 10.1016/j.jmbbm.2018.11.011. Epub 2018 Nov 16.

DOI:10.1016/j.jmbbm.2018.11.011

PMID:30476807

Abstract

In this work, graphene oxide (GO) reinforcement was used to improve the strength and fracture toughness of the calcium phosphate (CaP) coating applied on the anodized titanium using pulse electrodeposition. Based on the results, the CaP coating consisted of mixed phases of octa-calcium phosphate (OCP), dicalcium phosphate dehydrate (DCPD) and hydroxyapatite (HAp); however, compositing of this coating with GO caused deposition of the pure HAp phase. Moreover, the nanohardness and Young's modulus of the CaP-GO coating increased over 52% and 41%, respectively, as compared to those measured for the GO-free coating. An improvement of about 16% in the adhesion strength of the CaP coating composited with GO to the anodized titanium was also arisen from improving integrity, crystallinity and decreasing the Young's modulus mismatch of this coating with titanium substrate. Finally, uniformity in the microstructure and more biostability of the CaP-GO coating led to its better protection against the corrosion of anodized titanium.

摘要

在这项工作中，使用氧化石墨烯（GO）增强来提高通过脉冲电镀施加在阳极氧化钛上的磷酸钙（CaP）涂层的强度和断裂韧性。基于结果，CaP 涂层由八钙磷酸盐（OCP）、二水磷酸氢钙（DCPD）和羟基磷灰石（HAp）的混合相组成；然而，这种涂层与 GO 的复合导致了纯 HAp 相的沉积。此外，与不含 GO 的涂层相比，CaP-GO 涂层的纳米硬度和杨氏模量分别增加了 52%和 41%。GO 复合 CaP 涂层与阳极氧化钛的附着强度也提高了约 16%，这是由于提高了涂层的完整性、结晶度，并降低了其与钛基体的杨氏模量失配。最后，CaP-GO 涂层的微观结构均匀性和更好的生物稳定性导致其对阳极氧化钛腐蚀的更好保护。