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机构地区:[1]东南大学,江苏南京210096 [2]香港城市大学
出 处:《稀有金属材料与工程》2006年第6期994-997,共4页Rare Metal Materials and Engineering
基 金:江苏省自然科学基金项目(BK2003062)资助
摘 要:利用H2O2和NaOH溶液对近等原子比NiTi记忆合金(SMA)进行复合活化处理,并采用XRD,SEM,XPS,FTIR等研究了活化处理后NiTiSMA的表面结构及其在模拟体液(SBF)中磷灰石涂层的仿生沉积过程。结果表明:复合活化处理后NiTiSMA表面为贫Ni、富含Ti-OH的蠕虫状活性层,由结晶度较低的TiO2,钛酸纳(Na2TiO3)及少量的Ni2O3组成,在SBF中表面活性层诱导磷灰石形核及生长,短期内在镍钛基体表面获得了理想的磷灰石层。The surface structure was characterized by XRD, SEM, XPS and FTIR for the NiTi shape memory alloy (SMA) with a nearly-equiatomic ratio after composite bioactive treatment in H2O2 and subsequent NaOH solutions. The biomimetic deposition process of apatite coatings on the pretreated NiTi SMA was studied in the simulated body fluid (SBF). The experimental results indicate that a wormlike bioactive layer with many Ti-OH groups and a trait of Ni2O3 is formed on the NiTi substrate after the composite bioactive treatment, which was mainly composed of the poorly-crystallized Na2TiO3 and TiO2 and relatively poor in Ni. The bioactive layer can induce the apatite nucleation and growth in SBF and obtain an ideal apatite coating on NiTi substrate in a short term.
关 键 词:形状记忆合金(SMA) NITI 复合活化处理 磷灰石
分 类 号:TG179[金属学及工艺—金属表面处理]
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