NiTi合金表面渗Ti合金层及微弧氧化复合陶瓷膜层的制备与性能研究

发布时间：2018-04-01 16:26

  本文选题：双辉等离子合金化　切入点：微弧氧化　出处：《太原理工大学》2017年硕士论文

【摘要】：NiTi合金具有独特的形状记忆效应、超弹性以及低的弹性模量,在工程领域得到广泛应用,作为生物医用材料时,由于其较低的硬度以及镍离子的毒性会引起人体的不良反应,而且作为植入体材料,与周围组织的磨损和腐蚀会加剧镍离子的释放,降低NiTi合金的使用安全性。因此,为了提高NiTi合金的耐磨性和耐腐蚀性,屏蔽镍离子的析出,本文采用双辉等离子合金化技术在NiTi合金表面制备渗Ti合金层,采用SEM、EDS、GDOES、XRD等方法研究了不同保温温度和不同工作气压对合金层的影响,分析了合金层的力学性能。在此基础上,在合金层表面利用微弧氧化技术制备多孔陶瓷膜层,系统研究了陶瓷膜层的表面形貌、成分及组织结构。采用电化学测试技术与滑动摩擦实验研究了渗Ti合金层以及陶瓷膜层的耐腐蚀性能以及在干摩擦条件和模拟体液中的耐磨性,为NiTi合金表面改性层在工程及生物医学领域的应用奠定了理论基础。双辉等离子合金化技术在NiTi合金表面制备均匀致密的渗Ti合金层,合金层由沉积层和扩散层组成。合金层的典型制备工艺为:保温温度875-900℃,工作气压35-40Pa,极间距18-19mm,保温时间3h,压差250V。渗Ti合金层的力学性能得到明显的提高,在900℃、40Pa试样的硬度最高超过1400 HV0.025,其它工艺的试样硬度均超过700 HV0.025。合金层与基体之间达到良好的冶金结合,合金层剥离的临界载荷超过180N。通过动电位极化曲线和阻抗谱分析渗Ti合金层的电化学性能,不同温度和不同气压下的渗Ti合金层的腐蚀电流密度明显降低,极化电阻值显著提高,渗Ti合金层试样的阻抗及相位角均高于基材,渗Ti合金层明显提高了NiTi基材的耐腐蚀性能。在干摩擦条件下,900℃,35Pa渗Ti合金层试样的比磨损率最低,仅为基材比磨损率的15.8%,渗Ti合金层试样干摩擦条件下的磨损机理主要是磨粒磨损,粘着磨损和氧化磨损。在模拟体液中,875℃,35Pa渗Ti合金层试样的比磨损率最低,渗Ti合金层在模拟体液中磨损形式主要是磨粒磨损和轻微的氧化磨损。渗Ti合金层明显提高了NiTi合金的耐磨性。通过微弧氧化技术在Ni Ti基材与渗Ti合金层试样表面制备粗糙多孔陶瓷膜层,膜层主要由γ-Al2O3相构成。极化曲线分析得出,与NiTi基材的陶瓷膜层相比,渗Ti合金层的陶瓷膜层的自腐蚀电位提高了62.87%,腐蚀电流密度降低了24.03%。而与基材相比,渗Ti合金层的陶瓷膜层的自腐蚀电位提高了44.34%,腐蚀电流密度降低了99.01%,微弧氧化膜层可以提高NiTi的耐腐蚀性能,且渗Ti合金层试样表面制备的陶瓷膜层腐蚀性能更好。在渗Ti合金层表面通过微弧氧化制备陶瓷膜层可以明显提高材料的在干摩擦条件和模拟体液中的耐磨性能,磨损机理主要为粘着磨损。
[Abstract]:NiTi alloy has a unique shape memory effect, super elasticity and low elastic modulus, is widely used in the field of engineering, as biomedical materials, due to its low hardness and nickel ion toxicity can cause adverse reactions in the human body, but also as an implant material, and the surrounding tissue will aggravate the wear and corrosion the nickel ion release, reduce the use safety of NiTi alloy. Therefore, in order to improve NiTi alloy wear resistance and corrosion resistance, precipitation of shielding nickel ions, the technology of double glow plasma alloy on the surface of NiTi alloy prepared by infiltration Ti alloy layer, using SEM, EDS, GDOES, XRD methods different temperature and different influence of working pressure on the mechanical properties of the alloy layer, the alloy layer is analyzed. On this basis, the alloy surface layer by microarc oxidation technology for preparation of porous ceramic coating system of ceramic The film surface morphology, composition and structure. Using electrochemical testing technology and experimental study of friction sliding infiltration Ti alloy layer and corrosion resistance of ceramic coatings and wear resistance in dry friction condition and in SBF, laid the theoretical foundation for the application of NiTi alloy surface modification layer in the field of engineering and biological medicine. The technology of double glow plasma alloy on the surface of NiTi alloy prepared by uniform and dense infiltration of Ti alloy, alloy layer composed of deposition layer and diffusion layer. The typical preparation process of alloy layer: temperature 875-900 DEG C, the pressure of 35-40Pa, electrode spacing 18-19mm, holding time 3h, pressure 250V. permeability and mechanical properties of Ti the alloy layer is improved obviously, at 900 degrees, the highest hardness of 40Pa specimen exceeds 1400 HV0.025, the hardness of other processes are more than 700 HV0.025. between the coating and the substrate alloy achieved good metallurgical bonding together. The critical load of gold layer stripping over 180N. by potentiodynamic polarization and impedance spectroscopy analysis of seepage electrochemical properties of Ti alloy layer, permeability and corrosion current density of Ti alloy layer decreased significantly different temperature and pressure, the polarization resistance was significantly increased, infiltration impedance and phase angle of the specimen of Ti alloy layer was higher than that of the substrate, infiltration Ti alloy layer significantly improves the corrosion resistance of the NiTi substrate. Under the condition of dry friction, 900 DEG C, 35Pa infiltration specimens of Ti alloy layer than the lowest wear rate, only for the substrate specific wear rate 15.8%, infiltration of Ti alloy layer dry wear mechanism of the friction condition is mainly abrasive wear, adhesive wear and oxidation wear. In SBF, 875 DEG C, 35Pa infiltration specimens of Ti alloy layer than the lowest wear rate, permeability of Ti alloy in SBF wear form is mainly abrasive wear and mild oxidative wear. Infiltration of Ti alloy layer can significantly improve the NiTi The wear resistance of gold. The Ni Ti substrate and Ti alloy layer permeability surface preparation of rough and porous ceramic coating technology of microarc oxidation coating is mainly composed of -Al2O3 and gamma phases. The polarization curve analysis, compared with the NiTi substrate and the ceramic coating, coating of Ti alloy layer of ceramic coating corrosion potential increased by 62.87%, corrosion the current density is reduced by 24.03%. and compared with the base material, permeability of Ti alloy layer of ceramic coating corrosion potential increased by 44.34%, the corrosion current density decreased by 99.01%, microarc oxidation coating can improve the corrosion resistance of NiTi, and the Ti alloy layer permeability test of ceramic coating corrosion resistance better sample surface preparation of Ti alloy in the infiltration. The surface layer is prepared by micro arc oxidation ceramic coating can improve the wear resistance of materials under dry friction conditions and simulated body fluid, the main wear mechanism is adhesive wear.

【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】：TG174.4

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