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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Laser fabrication of porous surface layer on NiTi shape memory alloy
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Laser fabrication of porous surface layer on NiTi shape memory alloy

机译：在NiTi形状记忆合金上激光制造多孔表面层

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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 TiH_2 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, Ti_2Ni, TiNi_3 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.
机译：多孔的NiTi形状记忆合金通过促进组织向内生长和将体液输送到植入物而增强了骨整合性。为了保留块状NiTi的优异热机械性能并改善其生物相容性，使用激光表面工程技术在块状NiTi样品上制造了一个多孔表面层。 NiSMA和TiH_2的粉末混合物在SMA上进行了激光表面合金化。研究了改性表面层的宏观结构和微观结构。形成了由NiTi，Ti_2Ni，TiNi_3和TiN组成的几百微米厚的多孔层。层中的孔在3D中显示出相互连接的形态。 Ni含量从基材中的49.2原子％降低到改性层表面附近的12.5原子％。

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