【摘要】：鎂及鎂合金具有高的比強度和比剛度,彈性模量和密度與人體硬組織接近和可降解性,是理想的硬組織替代材料。將多孔結(jié)構(gòu)引入鎂,更有利于血液和營養(yǎng)運輸和傳送,血管和肌肉長入。但是多孔結(jié)構(gòu)也會降低材料的強度和耐蝕性。本論文采用微波燒結(jié)技術(shù)制備了多孔Mg,并對其進行了SiC顆粒增強(形成SiC/Mg復合材料)和微弧氧化表面改性研究。探討了工藝參數(shù)和造孔劑對多孔Mg表面形貌、孔隙率、硬度、壓縮性能、耐蝕性能以及降解性能的影響規(guī)律;研究了Si C顆粒含量以及粒徑對多孔Mg的顯微結(jié)構(gòu)、相組成、壓縮性能、降解性能以及摩擦性能的影響;研究了微弧氧化電參數(shù)對多孔Mg陶瓷膜顯微結(jié)構(gòu)和耐蝕性的影響。試驗結(jié)果表明隨著微波燒結(jié)溫度的增加、保溫時間的延長和壓制壓力的降低,多孔Mg的孔隙率增大,顯微硬度下降。隨著造孔劑含量的增加,多孔Mg的孔隙率隨之增加,而造孔劑粒徑的大小對多孔Mg孔隙率影響不大;隨著孔隙率的增加,多孔Mg的壓縮強度和彈性模量隨之降低,腐蝕電流密度逐漸增加,極化電阻逐漸減小。隨著多孔Mg孔徑的增大,其壓縮強度逐漸降低,彈性模量和耐蝕性變化不大;隨著孔隙率的增加,浸泡時間的延長,多孔Mg在SBF溶液中的失重率增加,降解速率也增加,而SBF溶液的PH值隨著浸泡時間的延長而增大,但孔隙率對PH的影響不大。SiC增強相的加入對多孔Mg的顯微結(jié)構(gòu)無明顯影響,但多孔SiCp/鎂基復合材料的壓縮強度隨著SiC含量的增加先增加后減小,10%時獲得最大值,而彈性模量隨著SiC含量的增加呈增加,其壓縮強度和彈性模量較多孔Mg最大可提高了47.87%和57.32%;多孔SiCp/鎂基復合材料的壓縮強度隨著SiC粒徑的增大而增大,彈性模量隨著SiC粒徑的增大,先增大后減小;SiC含量對多孔Mg的耐蝕性影響不大;多孔Si Cp/鎂基復合材料的摩擦系數(shù)、磨損體積和磨損率均隨著Si C顆粒含量的增加而增大。微弧氧化處理未改變多孔Mg的固有多孔結(jié)構(gòu),經(jīng)微弧氧化處理后,多孔Mg表面和孔內(nèi)壁均形成了典型的微弧氧化粗糙多孔陶瓷層,其厚度在1.5~7.8μm。微弧氧化處理后的多孔Mg其耐蝕性較基體提高1個數(shù)量級以上,在SBF溶液中的降解速率和失重率也有所降低。
[Abstract]:Magnesium and magnesium alloys have high specific strength and specific stiffness, elastic modulus and density are close to and degradable to human hard tissue, so magnesium alloy is an ideal substitute material for hard tissue. Introduction of porous structure into magnesium, more conducive to blood and nutrition transport and transport, blood vessels and muscle growth. However, porous structure can also reduce the strength and corrosion resistance of the material. In this paper, porous Mg, was prepared by microwave sintering, and SiC particle reinforced (formed SiC/Mg composite) and surface modification by micro-arc oxidation were studied. The effects of process parameters and pore-forming agents on the surface morphology, porosity, hardness, compression property, corrosion resistance and degradation performance of porous Mg were discussed. The effects of Si-C content and particle size on the microstructure, phase composition, compressive properties, degradation properties and friction properties of porous Mg ceramic films were studied, and the effects of micro-arc oxidation electrical parameters on the microstructure and corrosion resistance of porous Mg ceramic films were studied. The experimental results show that the porosity of porous Mg increases and the microhardness decreases with the increase of microwave sintering temperature, the prolongation of holding time and the decrease of pressing pressure. With the increase of pore-forming agent content, the porosity of porous Mg increases, but the size of pore-forming agent has little effect on the porosity of porous Mg. With the increase of porosity, the compressive strength and elastic modulus of porous Mg decrease, the corrosion current density increases and the polarization resistance decreases. With the increase of pore size of porous Mg, the compressive strength decreased gradually, and the elastic modulus and corrosion resistance did not change much. With the increase of porosity and immersion time, the weight loss rate and degradation rate of porous Mg in SBF solution increased, while the PH value of SBF solution increased with the prolongation of immersion time. However, the porosity has little effect on PH. The addition of sic reinforcement has no obvious effect on the microstructure of porous Mg, but the compressive strength of porous SiCp/ magnesium matrix composites increases first and then decreases with the increase of SiC content, and reaches the maximum value at 10%. With the increase of SiC content, the compressive strength and modulus of elasticity increased by 47.87% and 57.32%, respectively, compared with porous Mg. The compressive strength of porous SiCp/ magnesium matrix composites increases with the increase of SiC particle size, and the elastic modulus increases first and then decreases with the increase of SiC particle size, while the SiC content has little effect on the corrosion resistance of porous Mg. The friction coefficient, wear volume and wear rate of porous Si Cp/ magnesium matrix composites increase with the increase of Si-C particle content. Micro-arc oxidation treatment did not change the inherent porous structure of porous Mg. After micro-arc oxidation treatment, both the surface and inner wall of porous Mg formed a typical micro-arc oxidation rough porous ceramic layer, the thickness of which was 1.5 ~ 7.8 渭 m. The corrosion resistance of porous Mg treated by micro-arc oxidation is more than one order of magnitude higher than that of matrix, and the degradation rate and weight loss rate in SBF solution are also decreased.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.4;TB333

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