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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。
The near-atomic ratio TiNi alloy was prepared by powder metallurgy method with Ti and Ni pure elemental powders, and the alloy was surface modified by the bionic solution growth method. The phase composition of hydroxyapatite on the surface of metal substrate with different sintering temperature (950, 1000, 1050 and 1100 ℃) and different pore characteristics was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) And microstructure. The results show that the porosity of TiNi alloy prepared by powder metallurgy method is high, and the diffraction peak of hydroxyapatite phase in XRD patterns after bionic mineralization is sharp. At the same time, under the same mineralization condition, the surface of porous TiNi alloy sintered at 1050 ℃ and 1100 ℃ has higher crystallinity, thicker sedimentary layer and better deposition effect. Within a certain range, the increase of porosity is conducive to the hydroxyapatite nucleation and growth; while the smaller size of the bottom of the hole will form a low ion concentration region, is not conducive to the apatite nucleation and growth.