Structure and apatite induction of a microarc-oxidized coating on a biomedical titanium alloy

被引:24
作者
Zhao, G. L. [1 ]
Li, X. [2 ]
Xia, L. [1 ]
Wen, G. [1 ,2 ]
Song, L. [1 ]
Wang, X. Y. [1 ]
Wu, K. [2 ]
机构
[1] Harbin Inst Technol Weihai, Sch Mat Sci & Engn, Weihai 264209, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
关键词
Micro-arc oxidation; Coating; Alkali-treatment; Apatite; Low-modulus titanium alloy; IN-VITRO BIOACTIVITY; CHEMICAL-TREATMENT; HYDROTHERMAL TREATMENT; ARC OXIDATION; HEAT-TREATMENT; ELECTROPHORETIC DEPOSITION; HYDROXYAPATITE COATINGS; WETTABILITY GRADIENT; CALCIUM-PHOSPHATE; ALKALI-TREATMENT;
D O I
10.1016/j.apsusc.2010.09.012
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An oxide coating with nanostructure was prepared by micro-arc oxidation (MAO) on a biomedical Ti-24Nb-4Zr-7.9Sn alloy. Chemical composition of the coating mainly includes O, Ti, Nb, Ca, P, Na, Zr and Sn, where the ratio of Ca/P is about 1.6. Ti, Nb, Zr and Sn participate in the oxidation to form TO(2), Nb(2)O(5), ZrO(2) and SnO(2) nanocrystals, while Ca, P and Na are present in the form of amorphous phases. After alkali treatment, the surface of the MAO coating becomes rough, and Na concentration increases remarkably while P disappears basically. The alkali treated coating shows better apatite forming ability than the untreated one, as evidenced by apatite formation after SBF immersion for 7 days. The improvement of apatite forming ability of the modified coating is attributed to the formation of a sodium titanate layer and numbers of submicron-scale network flakes. The enhancement of the surface wettability of the alkali treated coating also plays an important role in promoting the apatite forming ability. (C) 2010 Published by Elsevier B.V.
引用
收藏
页码:1762 / 1768
页数:7
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