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Tribological Properties of Biomedical NiTi Shape Memory Alloy after Rf Plasma Nitriding

机译:射频等离子体渗氮后生物医学NiTi形状记忆合金的摩擦学性能

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Nickel titanium (NiTi) alloys are potentially useful in biomedical applications due to their unique superelasticity behaviour and shape memory effects (SME). However, these alloys are vulnerable to surface corrosion and the most serious issue is out-diffusion of toxic Ni ions from the substrate into body tissues and fluids. Hence, it is necessary to produce a surface barrier to impede the out-diffusion of Ni ions from the alloys. The inductively coupled radio frequency plasma (ICRFP) is an efficient technique for modifying the surfaces of NiTi alloys. The results exhibit the enhancement of the corrosion resistance and tribological properties of the NiTi substrate, but also effectively suppress the Ni ions release from the substrate. All these improvements can be attributed to the formation of titanium nitride (TiN) on the surface of NiTi alloys.
机译:镍钛(NiTi)合金由于其独特的超弹性行为和形状记忆效应(SME)可能在生物医学应用中有用。但是,这些合金很容易受到表面腐蚀,最严重的问题是有毒的镍离子从基体向外扩散到人体组织和体液中。因此,必须形成表面阻挡层以阻止Ni离子从合金中向外扩散。感应耦合射频等离子体(ICRFP)是一种用于修饰NiTi合金表面的有效技术。结果显示出增强的NiTi基底的耐腐蚀性和摩擦学性能,但是还有效地抑制了Ni离子从基底释放。所有这些改进可以归因于在NiTi合金表面上形成氮化钛(TiN)。

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