Wear resistance of micro-arc oxidation coatings on biomedical NiTi alloy

被引：39
作者：
Liu, F. [1 ]
Xu, J. L. [1 ]
Yu, D. Z. [2 ]
Wang, F. P. [3 ]
Zhao, L. C. [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Stomatol Med Ctr, Harbin 150001, Peoples R China
[3] Harbin Inst Technol, Dept Appl Chem, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 487卷 / 1-2期
关键词：
NiTi alloy; Ceramic coating; Micro-arc oxidation; Wear resistance; SHAPE-MEMORY ALLOY; CORROSION-RESISTANCE; CERAMIC COATINGS; MECHANICAL-PROPERTIES; NICKEL; BEHAVIOR; BIOCOMPATIBILITY; IMPLANTATION; IMPROVEMENT;
D O I：
10.1016/j.jallcom.2009.07.145
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：
Protective coatings were successfully formed on biomedical NiTi alloy by micro-arc oxidation (MAO) using pulsed bipolar power supply. The coating surface exhibits a typical MAO porous structure, and the coating mainly consists of O, Al, Ti and Ni, with the atomic concentration of 65.11%, 27.77%, 2.20% and 2.8%, respectively. The thickness of MAO coating is about 24.0 mu m when the duration time of the MAO treatment was 90 min at 400 V constant voltage treatment. XRD analysis showed that micro-arc oxidation coating is composed of gamma-Al2O3 and alpha-Al2O3. The wear resistance of the coatings was investigated by ball-on-disk friction test. The microhardness of the NiTi alloy is greatly enhanced due to the formation of Al2O3 coating after micro-arc oxidation treatment. The friction coefficient of the coated NiTi is stable at 0.85 and the wear resistance is increased by 9 times compared with uncoated NiTi. The wear mechanism transforms from abrasive-dominant for the uncoated sample to adhesive-dominant for the coated sample. (C) 2009 Elsevier B.V. All rights reserved.
引用
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页码：391 / 394
页数：4
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