摘要
分析了近等原子比NiTi形状记忆合金实现去合金化的热力学条件,并采用低温去合金化处理法对其进行表面改性;经SEM、XRD、XPS、EDX,模拟体液(SBF)仿生沉积等分析研究表明,NiTi合金经去合金化处理后,在合金表面选择性地除去了有害元素镍,在距表层约130nm深度内原位制备出完全无镍的具有纳米结构的二氧化钛层;同时结合上羟基(OH-),在SBF溶液中,经低温去合金化处理后的合金表面具有诱导Ca/P沉积的能力,从而提高了NiTi形状记忆合金的生物相容性。
After calculated the dealloying conditions of thermodynamics, a dealloying treatment method is applied to nearly equiatomic NiTi alloy so as to remove the harmful element from NiTi alloys and form a Ni-free titanium oxide layer on the surface. The surface of sample is analyzed by SEM, XRD, XPS and EDX, and then immersed in SBF solution for up to 14 days in order to observe the Ca/P deposition. The results show that the dealloying treatment at low temperature leads to a Ni-free surface layer with a nanometer structure at the depth of 130 nm, and in situ to form a titania surface with a degree of bioactivity and ability to induce Ca/P precipitates combined with hydroxyl （OH^-） groups in the solution simultaneously. As a consequence, the dealloying treatment can increase the biocompatibility of NiTi shape memory alloys for medical applications.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第5期859-863,共5页
Rare Metal Materials and Engineering
基金
“贵州省优秀科技教育人才省长专项基金”资助(2005214)
