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Study on Biomedical Film by the Technique of Plasma Surface Modification on NiTi Alloy

Author: LiuXiLiang
Tutor: ZhengYuFeng
School: Harbin Engineering University
Course: Materials Science
Keywords: NiTi alloy Plasma Surface Modification Hemocompatibility
CLC: R318.08
Type: Master's thesis
Year: 2007
Downloads: 159
Quote: 0
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Abstract


In this paper, the microwave plasma surface modification technology to improve the the NiTi alloy hardness , wear resistance , corrosion resistance and biocompatibility . By atomic force microscopy , X - ray photoelectron spectroscopy , X - ray diffraction , Raman spectroscopy , transmission electron microscopy (TEM), nanoindentation test , adhesion test , friction coefficient test , electrochemical test and blood compatibility tests such as analysis method to study the different deposition the element and deposition parameters on the film properties . By plasma immersion ion implantation and deposition method zirconium film . The AFM test results show that the zirconium film columnar growth . As the injection pressure increase in the film surface roughness (RMS) of little value changes . The electrochemical tests show that the injection of high pressure and a sputtering target current decision factors that can affect the corrosion resistance of the zirconium film , injecting high pressure is higher , the greater the sputtering current , the corrosion resistance of the zirconium film can be better . Gradient nano the the composite Zr-ZrC-ZrC/DLC film and gradient nano composite Ti-TiC-TiC/DLC - - film plasma immersion ion implantation and deposition plasma enhanced chemical vapor deposition method were prepared . Raman spectroscopy and XPS showed that the doped DLC films still have the typical DLC film structure . XRD and TEM results confirm the nanoscale carbide particles uniformly embedded in amorphous DLC films . The AFM study found that the the The the doped the zirconium DLC film still in columnar growth, titanium-doped DLC films by lower the RMS value of the lamellar grew up doping elements is to determine the way the decision of the thin film growth factors . As can be found from the binding force of the film test and coefficient of friction test , to doped zirconium DLC film having excellent binding properties, but better friction properties of titanium-doped DLC film . Nano - indentation test results show that by changing the deposition of negative bias and C 2 H 2 flow rate can increase the hardness and elastic modulus of the film . The electrochemical test results show that doped zirconium DLC film corrosion resistance by the deposition parameters decision , but has little effect on the titanium-doped DLC films , mainly because of the titanium-doped DLC films lamellar growth . Platelet adhesion test results show that the modified film significantly improved the performance of the blood compatibility of the NiTi alloy .

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues > Biomaterial
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