本文選題：雙輝等離子合金化　切入點：微弧氧化　出處：《太原理工大學》2017年碩士論文

【摘要】：NiTi合金具有獨特的形狀記憶效應、超彈性以及低的彈性模量,在工程領(lǐng)域得到廣泛應用,作為生物醫(yī)用材料時,由于其較低的硬度以及鎳離子的毒性會引起人體的不良反應,而且作為植入體材料,與周圍組織的磨損和腐蝕會加劇鎳離子的釋放,降低NiTi合金的使用安全性。因此,為了提高NiTi合金的耐磨性和耐腐蝕性,屏蔽鎳離子的析出,本文采用雙輝等離子合金化技術(shù)在NiTi合金表面制備滲Ti合金層,采用SEM、EDS、GDOES、XRD等方法研究了不同保溫溫度和不同工作氣壓對合金層的影響,分析了合金層的力學性能。在此基礎上,在合金層表面利用微弧氧化技術(shù)制備多孔陶瓷膜層,系統(tǒng)研究了陶瓷膜層的表面形貌、成分及組織結(jié)構(gòu)。采用電化學測試技術(shù)與滑動摩擦實驗研究了滲Ti合金層以及陶瓷膜層的耐腐蝕性能以及在干摩擦條件和模擬體液中的耐磨性,為NiTi合金表面改性層在工程及生物醫(yī)學領(lǐng)域的應用奠定了理論基礎。雙輝等離子合金化技術(shù)在NiTi合金表面制備均勻致密的滲Ti合金層,合金層由沉積層和擴散層組成。合金層的典型制備工藝為:保溫溫度875-900℃,工作氣壓35-40Pa,極間距18-19mm,保溫時間3h,壓差250V。滲Ti合金層的力學性能得到明顯的提高,在900℃、40Pa試樣的硬度最高超過1400 HV0.025,其它工藝的試樣硬度均超過700 HV0.025。合金層與基體之間達到良好的冶金結(jié)合,合金層剝離的臨界載荷超過180N。通過動電位極化曲線和阻抗譜分析滲Ti合金層的電化學性能,不同溫度和不同氣壓下的滲Ti合金層的腐蝕電流密度明顯降低,極化電阻值顯著提高,滲Ti合金層試樣的阻抗及相位角均高于基材,滲Ti合金層明顯提高了NiTi基材的耐腐蝕性能。在干摩擦條件下,900℃,35Pa滲Ti合金層試樣的比磨損率最低,僅為基材比磨損率的15.8%,滲Ti合金層試樣干摩擦條件下的磨損機理主要是磨粒磨損,粘著磨損和氧化磨損。在模擬體液中,875℃,35Pa滲Ti合金層試樣的比磨損率最低,滲Ti合金層在模擬體液中磨損形式主要是磨粒磨損和輕微的氧化磨損。滲Ti合金層明顯提高了NiTi合金的耐磨性。通過微弧氧化技術(shù)在Ni Ti基材與滲Ti合金層試樣表面制備粗糙多孔陶瓷膜層,膜層主要由γ-Al2O3相構(gòu)成。極化曲線分析得出,與NiTi基材的陶瓷膜層相比,滲Ti合金層的陶瓷膜層的自腐蝕電位提高了62.87%,腐蝕電流密度降低了24.03%。而與基材相比,滲Ti合金層的陶瓷膜層的自腐蝕電位提高了44.34%,腐蝕電流密度降低了99.01%,微弧氧化膜層可以提高NiTi的耐腐蝕性能,且滲Ti合金層試樣表面制備的陶瓷膜層腐蝕性能更好。在滲Ti合金層表面通過微弧氧化制備陶瓷膜層可以明顯提高材料的在干摩擦條件和模擬體液中的耐磨性能,磨損機理主要為粘著磨損。
[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.

【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG174.4

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