多孔TiNi合金表面沉积羟基磷灰石与表征  

Calcium Phosphate Deposition on the Surface of Porous Ti Ni Alloys with Different Sintering Temperatures in Simulated Body Fluid

作　　者：刘珏[1] 李婧[1] 刘超[1] 刘敏[1] 阮建明[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2016年第2期470-476,共7页Rare Metal Materials and Engineering

基　　金：中南大学研究生自主探索创新项目(2014zzts177);国家自然科学基金(51274247);国家高技术研究发展计划("863"计划)(2012BAE06B00)

摘　　要：采用粉末冶金方法,以Ti、Ni纯元素粉末制备近等原子比TiNi合金,并通过仿生溶液生长法对合金进行表面改性。利用X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线能谱(EDS)分析不同烧结温度(950,1000,1050,1100℃)、不同孔隙特性的金属基体表面羟基磷灰石相组成和微观结构。结果表明,采用粉末冶金方法制备的TiNi合金孔隙度较高,仿生矿化后的XRD图谱中羟基磷灰石相的衍射峰尖锐。在同等时间、同等矿化条件下,羟基磷灰石在1050和1100℃烧结而成的多孔TiNi合金表面结晶度较高,沉积层较厚,沉积效果相对较好。在一定范围内,孔隙率的增加有利于羟基磷灰石的形核与生长;而尺寸较小的孔洞底部会形成一个低离子浓度区域,不利于磷灰石的形核与长大。Near-equiatomic Ti Ni alloys were produced by powder metallurgy（P/M） using Ti and Ni powders at different temperatures（950, 1000, 1050, 1100 ℃）. To obtain a material surface having excellent affinity to bone, surface modification by hydroxyapatite coatings wasconducted in a simulated body fluid（SBF）. Phase composition and surface structure of Ca-P coatings were characterized by X-ray diffractometry（XRD）, scanning electron microscopy（SEM） and energy dispersive X-ray spectroscopy（EDS） attached to SEM. Results indicate that porosity of TiNi alloys produced by P/M is high and peaks of hydroxyapatite is sharp. In the same experimental condition, more apatite coatings are formed on TiNi samples sintered at 1050 ℃ and 1100 ℃ due to their high porosity and pure TiNi phase, which is beneficial to heterogeneous nucleation. However, a low ion concentration region is formed in the bottom of small-sized holes, and it is not helpful to heterogeneous nucleation.

关 键 词：TINI合金 羟基磷灰石(HA) 表面改性 模拟体液(SBF) 

分 类 号：TF125[冶金工程—粉末冶金] TG174.4[冶金工程—冶金物理化学]