激光直接沉積制備生物骨材料研究
[Abstract]:The global population growth and population aging trend, as well as traffic, natural disasters and other accidents, the need for bone transplantation or replacement is increasing. Among all kinds of biomaterials, metal and metal-based biomaterials have been widely used in the field of clinical implantation due to their excellent mechanical properties. In recent years, with the development of laser direct deposition technology, the preparation of biomaterials by laser direct deposition has become one of the leading research topics. Titanium alloy and cobalt-chromium alloy have become important materials for laser surface treatment and direct deposition because of their basic properties of biomaterials. In this study, Ti based biological bone coatings and Co-Cr based biological bone coatings based on TC4 were prepared by laser diode direct deposition technique, and high thick cobalt chromium composite materials were fabricated by deposition on Q235 steel sheet. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), hardness, friction and wear and electrochemical analysis were used to study the microstructure, properties and preparation mechanism of the samples. The results show that the optimized deposition process parameters are: power 1500W, scanning speed 300mm / min, spot size 7.18mm 脳 4.30mm. The microstructure of the ceramic area at the top of the coating is loose and the pores are uniformly distributed on the surface, which is beneficial to the growth of bone tissue, and there are some bioceramics, such as HAC CaTiO _ 3, Ca3 (PO4) _ 2, in the coating. The optimized deposition process parameters of the top hardness of the coating up to 1900HV.Co-Cr based biological bone gradient coating are, The optimized power is 1400W, the scanning speed is 440 mm / min, the spot size is 7.6mm 脳 4.5mm, the optimized content of Zr02 in the second gradient layer is 2, the optimized content of Zr02 in the third gradient layer is 3 and the thickness of the gradient coating is about 3mm, it has good strength and toughness. The coating mainly contains CaTiO3Co2Ti4O and Ti03 bioceramics, and the top hardness of the coating is about 1500HV. Co-Cr composite biomaterials with thickness up to 7mm were prepared by laser direct deposition. It was found that Y203 could eliminate laser forming cracks, influence the transformation between 偽 -Co and 蔚 -Co and refine the microstructure. When 2wt.% Y203 was added, the cracks in the deposit layer were successfully eliminated, the hardness of the material reached 450 HVV, and the material had good wear resistance. The corrosion resistance of the three kinds of cobalt-chromium biocomposites with Y203 content in acidic oral environment was higher than that in neutral environment, and the corrosion rate of 2wt.%Y2O3 content samples was the lowest in both environments.
【學(xué)位授予單位】:東北大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R318.08
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