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| Ni RELEASING BEHAVIOR OF POROUS TiNi SHAPE MEMORY ALLOY |
| Hai-Chang JIANG; |
| 中国科学院金属研究所 |
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Cite this article:
Hai-Chang JIANG. Ni RELEASING BEHAVIOR OF POROUS TiNi SHAPE MEMORY ALLOY. Acta Metall Sin, 2008, 44(2): 198-202 .
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Abstract Porous NiTi shape memory alloy (SMA) with three-dimension connected pore structure and excellent biocompatibility owns the widely application as hard tissue implant. Affected by the special pore structure, nonequilibrium phases and internal stress induced by combustion synthesis process, the releasing rate of porous NiTi SMA in simulated body fluid and physiological saline is much higher than that of the dense NiTi SMA with same nominal surface area. The Ni releasing rate of porous NiTi SMA under bending strain will further increase. After immersion in 4M/L NaOH aqueous solution treatments for 24h and subsequent heating at 600℃ for 1h, a oxidation layer forms on the surface of the porous NiTi alloy. This layer prevents the porous NiTi alloy from the immersion solution and greatly decreases the amount of nickel release from the porous NiTi shape memory alloy.
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Received: 16 July 2007
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