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| 1 | NiTi形状记忆合金表面TiO_2薄膜的制备及其血液相容性显示文摘采用溶胶 凝胶法在NiTi合金表面制备了TiO2薄膜,用DSC分析了凝胶在加热过程中发生的转变。结果表明:在NiTi表面形成金红石型TiO2薄膜;覆盖有TiO2薄膜的NiTi合金与NiTi基体及316L不锈钢、Ti6Al4V相比,凝血时间延长,溶血率下降,说明TiO2膜可提高NiTi合金血液相容性。 | 耿芳 石萍 F.T.Cheng | 2004 | 中国有色金属学报2004，14，9： | 14 |
| 2 | On the Indeterminacy in Hardness of Shape Memory Alloys显示文摘The present communication addresses an interesting problem related to the indeterminacy in hardness of superelastic NiTi reported by Xu et al.[1]. The origin of the indeterminacy is attributed to the inadequacy of the conventional Vickers hardness testing measurement which does not record elastic deformation, and thus the indeterminacy may be removed with suitable techniques. Concepts of hardness in relation to deformation are clarified. Recommendations for measuring the hardness of NiTi and other elastic-plastic materials are suggested, together with comments on the advantages and disadvantages of each of these methods. | F.T.Cheng | 2004 | Journal of Materials Science & Technology2004，20，6： | 0 |
| 3 | Nature of Surface Layer and Electrochemical Behavior of NaOH Hydrothermally Treated NiTi Alloy显示文摘NiTi samples were hydrothermally treated in NaOH at 200℃ with different soaking times. The morphology of the surface layer formed was studied by scanning electron microscopy (SEM). The composition of the layer and the major phases present were determined by energy-dispersive spectroscopy (EDS) and X-ray diffractometry (XRD), respectively. In contrast to the results reported by some authors, the surface layer was essentially Ni(OH)2 instead of being TiO2. The electrochemical behavior of the samples was studied by electrochemical impedance spectroscopy (EIS) in 3.5% NaCI solution at 23℃, and analyzed using a simplified Randle circuit consisting of a resistance R and a capacitance C in parallel. After hydrothermal treatment, R was increased by a factor ranging from 1.5 to 5.0 times, depending on the treatment time. The value of R of all the samples became steady within a period of less than 15 h. Results of the present study indicate that alkaline treatment leads to the growth of an insulating layer on NiTi, but the method is not suitable for surface modification of NiTi implants due to the enhanced Ni content in the surface layer. | P.Shi F.T.Cheng H.C.Man | 2004 | Journal of Materials Science & Technology2004，20，2： | 0 |
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