生物医用多孔Ti-Ni形状记忆合金的

DEVELOPMENT OF BIOMEDICAL POROUS TI-NI SHAPE MEMORV ALLOYS

综述了多孔Ｔｉ－Ｎｉ形状记忆合金的发展历史、制备技术、生物相容性、力学性能及其应用等方面的研究进展一种用于人体硬组织修复和替换的新型生物医用材料一多孔Ｔｉ－Ｎｉ形状记忆合金，由于其多孔结构及独特的形状记忆与伪弹性、优良的生物相容性和力学性能等特点，伴随其制备工艺的改进，已经引起世界各国科学家的极大关注。

As a new kind of biomedical material for human hard tissue repair and replacement, porous NiTi shape memory alloy (SMA) has arisen great concern due to its special superelasticity, excellent biocompatibility, good mechanical property and unique porous structure. In this paper. the development history, fabrication technique, biocompatibility, mechanical property and application of porous NiTi SMA have been reviewed. The characterization of elemental powder sintering. pre-alloyed powder sintering and self-propagating high-temperature synthesis for the fabrication of porous NiTi alloy has been compared. It is indicated that mechanical property of porous NiTi SMA is dependent on its porosity and distribution of pores. Also, porosity and heat treatment have great effect on shape memory effect and superelasticity of porous NiTi SMA. The porous NiTi SMA has not only similar biocompatibility to that of bulk NiTi SMA, but also its porous structure favors ingrowth of bone tissue, which indicates that porous NiTi SMA is ideal material for human hard tissue repair and replacement. In Russia and other countries, porous NiTi SMA has been successfully used in orthopedics, cardiovascular surgery and other medical fields. With the improvement of fabrication technique. there should be a promising prospect for porous NiTi SMA.