添加镍元素对钛铜合金力学与腐蚀磨损性能的影响规律

发布时间：2018-02-27 14:44

本文关键词： Ti-Cu-Ni合金纳米压痕纳米力学性能摩擦磨损腐蚀　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：钛合金由于具有质轻,比强度高,无毒性,良好的抗蚀性能以及优异的生物相容性,已经成为临床广泛使用的医用金属材料。TiCu合金作为医用植入材料具有很大的应用潜力。近年来,对该合金的成分、相组成、抗菌性能及电催化特性均做了较为深入的研究。作为医用植入材料,需要综合考虑其抗菌性能、力学性能和腐蚀磨损性能拓宽其应用领域。基于TiNi合金具有独特的形状记忆性能,本文在已有合金Ti_(70)Cu_(30)的基础上,添加Ni对其进行合金化。制备出新型块体三元合金Ti_(65)Cu_(30)Ni_5和Ti_(60)Cu_(30)Ni_(10)。利用X射线衍射仪和辉光放电光谱仪对其相结构和成分分布进行表征；采用纳米压痕仪对Ti_(70)Cu_(30)、Ti_(65)Cu_(30)Ni_5和Ti_(60)Cu_(30)Ni_(10)合金的纳米力学性能进行了研究；采用电化学方法研究了合金在模拟人工体液中的电化学行为；采用球-盘摩擦磨损试验仪研究了合金的摩擦磨损性能。研究结果如下:1、对合金的组织结构和成分分布进行了分析。Ti_(70)Cu_(30)主要由CuTi和CuTi_3相组成；添加Ni合金化后,Ti_(65)Cu_(30)Ni_5主要由CuNiTi_2和TiNi_(0.8)Cu_(0.2)相组成,Ti_(60)Cu_(30)Ni_(10)有新的CuNi_(0.5)Ti_(0.5)O_2和CuNi_2Ti相出现。成分分布曲线显示Ti、Cu和Ni元素含量的最大原子百分比与合金化比例基本相近。2、纳米压痕仪对Ti_(70)Cu_(30)、Ti_(65)Cu_(30)Ni_5、Ti_(60)Cu_(30)Ni_(10)的纳米力学性能进行了比较研究。实验结果表明,添加镍元素有效提高了Ti_(70)Cu_(30)合金的硬度和抵抗外荷载的能力。5 at.%含量的镍元素添加使合金具有较高的弹性模量,而10 at.%含量的镍元素添加对合金弹性模量则有所降低。三种合金的弹性模量排序为Ti_(65)Cu_(30)Ni_5Ti_(70)Cu_(30)Ti_(60)Cu_(30)Ni_(10)。3、采用动电位极化曲线法和阻抗谱曲线法研究了三种合金在Hank's模拟体液中的电化学腐蚀性能。实验结果表明,添加镍元素降低了Ti_(70)Cu_(30)合金的耐腐蚀性能。当镍含量高达10 at.%时,合金在人工体液中剧烈腐蚀,发生大规模点蚀,结构完全破坏。4、采用摩擦磨损试验仪对三种合金的摩擦磨损性能及机理进行了研究。实验结果表明,在空气中干摩擦时,三种合金的磨损均为粘着磨损,Ti_(65)Cu_(30)Ni_5合金的抗磨损性能最好,Ti_(60)Cu_(30)Ni_(10)合金最差。在模拟人工体液介质中摩擦时,由于受电化学腐蚀的影响,三种合金的磨损机制各不相同。Ti_(60)Cu_(30)Ni_(10)主要是化学腐蚀磨损,Ti_(70)Cu_(30)呈现为磨粒磨损,Ti_(65)Cu_(30)Ni_5则介于两者之间,这也导致Ti_(65)Cu_(30)Ni_5的耐磨损性能最高。
[Abstract]:Titanium alloys are characterized by light weight, high specific strength, non-toxicity, good corrosion resistance and excellent biocompatibility. TiCu alloy, which has been widely used in clinic, has great application potential as medical implant material. In recent years, the composition and phase composition of this alloy have been studied. Both antibacterial and electrocatalytic properties have been studied in depth. As a medical implant, the antibacterial properties of these materials need to be considered comprehensively. The mechanical properties and corrosion wear properties of TiNi alloys have been extended to a wide range of applications. Based on the unique shape memory properties of TiNi alloys, this paper is based on the existing alloys TiSZ 70 CuSP-30). The new bulk ternary alloys Ti_(65)Cu_(30)Ni_5 and TiS60 / CuD were prepared by alloying Ni. The phase structure and composition distribution were characterized by X-ray diffractometer and glow discharge spectrometer. The nanomechanical properties of TiSZ 70CuS cuti30 / TiSP / 65CuS / 30C / Ni5 and TiS / 60C / Cu30 / NiS / 10) alloys were studied by means of nanoindentation, and the electrochemical behavior of the alloys in simulated artificial body fluids was studied by electrochemical method, and the electrochemical behavior of the alloys in simulated artificial body fluids was studied by means of electrochemical method, and the electrochemical behavior of the alloys in simulated artificial body fluids was studied by means of electrochemical method. The friction and wear properties of the alloy were studied by using a ball disk friction and wear tester. The results are as follows: 1. The microstructure and composition distribution of the alloy are analyzed. The microstructure and composition distribution of the alloy are analyzed. The microstructure of the alloy is mainly composed of CuTi and CuTi_3 phases. After the addition of Ni alloying, new CuNi_(0.5)Ti_(0.5)O_2 and CuNi_2Ti phases have been found. The maximum atomic percentages of Titiao Cu and Ni contents are close to those of alloying ratio of 0.2. The maximum atomic percentage of Titiao Cu and Ni contents is close to that of alloying ratio. The maximum atomic percentage of Titiao Cu and Ni content is similar to that of alloying ratio. The experimental results show that, The addition of nickel can effectively improve the hardness and the ability to resist external loads of TiSHA70 / CuTi30) alloy. The addition of nickel elements with a content of 5.5at.% makes the alloy have higher modulus of elasticity. The elastic moduli of the three alloys were in the order of Tiji 65CuD, Ni5TiTi30, Ni5TiTi30, CuST-30TiS, 30CuST-30TiS, 30T, 30T, 30T, 10T. 3. The electrical properties of the three alloys in Hank's simulated body fluid were studied by potentiodynamic polarization curve and impedance spectrum method, while the elastic modulus of the alloy decreased with the addition of 10 at.% Ni element, and the number of the three alloys in the simulated body fluid of Hank's was studied by means of potentiodynamic polarization curve method and impedance curve method. Chemical corrosion properties. Experimental results show that, The addition of nickel reduced the corrosion resistance of TiSHAN 70C / CuN 30) alloy. When the nickel content was as high as 10 at.%, the alloy was severely corroded in artificial body fluid, resulting in massive pitting corrosion. The friction and wear properties and mechanism of the three alloys were studied by friction and wear tester. The experimental results show that the friction and wear properties of the three alloys are dry in air. The wear properties of the three alloys are the best in the case of adhesive wear and tear wear, and the wear resistance of the TiServ / Ni5 alloy is the best than that of the Tiken 60 / Cu / 30 / NiS / 10) alloy. When friction is simulated in artificial body fluid, the wear resistance of the alloy is due to the effect of electrochemical corrosion. The wear mechanism of the three alloys is different.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG146.23

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