Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20931
Title: Microstructure and were performance of the laser gas nitrided NiTi shape memory alloy
Authors: Zhang, S
Zhang, C
Wang, Q
Man, H 
Zhu, S
Cai, Q
Keywords: Coating
Laser gas nitriding
Metal matrix composite
NiTi shape memory alloy
Issue Date: 2005
Publisher: 中國學術期刊(光盤版)電子雜誌社
Source: 稀有金屬材料與工程 (Rare metal materials and engineering), 2005, v. 34, no. 6, p. 986-989 How to cite?
Journal: 稀有金屬材料與工程 (Rare metal materials and engineering) 
Abstract: After irradiated by a continuous wave of Nd-YAG laser in N2 environment, a gradient TiN reinforced MMC coating can be obtained on the surface of NiTi shape memory alloy substrate. Experiments proved that the MMC coating reinforced with fine TiN and compact laser modified surface can be prepared by choosing optimum process parameters. There is a reinforced TiN ceramic layer of 1 μm ~2 μm in thickness and a gradient distribution of reinforced TiN inside the coating. SEM and EDX results indicated that there was a good metallurgical bonding between the hard MMC modification layer and the NiTi alloy substrate. Microhardness and wear test results showed that the surface hardness and wear resistance were significantly enhanced. Therefore, the surface composition and performance of NiTi shape memory alloy can be effectively improved and the harmful Ni2+ ions to human body can be effectively restrained by using laser surface modification for biomedical materials.
URI: http://hdl.handle.net/10397/20931
ISSN: 1002-185X
EISSN: 1875-5372
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