Ping Dong
材料科学技术（英）
Biomedical molecule has received extensive application in surface modification coating. In this paper, polyethyleneimine (PEI)/heparin coating and chitosan/heparin coating on NiTi alloy substrates were prepared by layer-by-layer method, and differences of corrosion behavior and biocompatibility of the coatings were studied. Static contact angles and Fourier transform infrared (FT-IR) test were used to analysis the surface morphology and structure character of the materials, and atomic absorption spectrum was used to verify the corrosion behavior of the materials. Furthermore, hemolysis, dynamic clotting time and platelet binding test were utilized to investigate the biocompatibility of the materials. The results revealed that the blood compatibility of PEI/heparin coating is better than that of the chitosan/heparin coating as well as the substrate.
关键词:
Biocompatibility
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袁志山
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吴艳华
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杨华
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周瑾
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崔跃
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李君涛
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缪卫东
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朱明
金属功能材料
近年来随着镍钛形状记忆合金的广泛应用,在镍钛合金标准的发展方面取得了长足的进步.先后有多项国家或行业镍钛合金产品标准和方法标准颁布,并且有多项镍钛合金标准正在审定和报批.介绍了镍钛合金标准发展的现状和最新进展,分析总结了镍钛合金标准分类、主要内容和标准水平,最后提出了镍钛合金标准发展的不足和发展建议.
关键词:
镍钛合金
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超弹性
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形状记忆效应
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NiT
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TiNi
林英华
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雷永平
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符寒光
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林健
金属学报
doi:10.11900/0412.1961.2014.00185
以不同配比的Ni粉末和TiB2粉末混合物为预置层,利用激光原位技术在钛合金表面制备了bcc结构的NiTi合金、TiB短纤维与TiB2颗粒增强钛基复合涂层.运用XRD,SEM与EPMA等实验手段,对合成的钛基复合涂层进行测试分析.结果表明,随着激光功率密度与Ni粉末添加量的增加,涂层表面成型质量得到改善;然而随着Ni添加量的提高,涂层中出现了NiTi2新相,且TiB短纤维变得粗大;通过热力学计算可知,反应驱动力大小顺序为Ni3Ti＞NiTi2＞NiTi＞TiB,并结合涂层中相种类及含量的变化规律,探讨了不同元素反应间的竞争机制.
关键词:
激光熔覆
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TC4钛合金
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TiB
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NiTi
