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Laser fabrication of porous surface layer on NiTi shape memory alloy

被引：22
作者：
Man, HC [1 ]
Zhang, S
Cheng, FT
Guo, X
机构：
[1] Hong Kong Polytech Univ, Laser Proc Grp, AMTRC, Dept Ind & Syst Engn, Hong Kong, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Dept Rehabil Sci, Hong Kong, Hong Kong, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 404卷 / 1-2期
关键词：
laser surface modification; NiTi; shape memory alloy; porous structure; biocompatibility;
D O I：
10.1016/j.msea.2005.05.020
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 [材料科学与工程]; 080502 [材料学];
摘要：
Porous NiTi shape memory alloys provide enhanced osteointegration by facilitating tissue ingrowth and transport of body fluid to the implant. To retain the excellent thermomechanical properties of bulk NiTi and to improve its biocompatibility, a porous surface layer was fabricated on bulk NiTi samples using laser surface engineering techniques. A powder mixture of NiTi and TiH2 was laser surface alloyed on the SMA. The macrostructure and microstructure of the modified surface layer were studied. A porous layer of a few hundred micrometers thick was formed, composed of NiTi, Ti2Ni, TiNi3 and TiN. The pores in the layer exhibited an inter-connected morphology in 3D. The Ni content was reduced from 49.2 at.% in the substrate to 12.5 at.% near the surface of the modified layer. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：173 / 178
页数：6
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