【作者】 孔令云；

【导师】 黄根良；

【作者基本信息】 江苏大学 ， 材料学， 2007， 硕士

【摘要】 本文主要研究了HAP粒子与金属Ni颗粒在不锈钢基体上的共沉积。不锈钢含有Cr和较多的稳定奥氏体元素Ni，耐蚀性好，具有较高的塑性，易加工成型，亦无毒，在医疗上(外科)已有广泛应用。虽然在不锈钢电镀方面国内外已进行过大量的研究，但在不锈钢基体上进行复合电镀处理却报道较少。本文采用有效的预处理方法将Ni-HAP复合镀层与不锈钢牢固结合起来，以获得结合力强、与人体组织相容性好、具有临床医学应用前景的镀层。本课题首先对羟基磷灰石粉末的制备作了研究，确定了最佳制备方法，并对制备过程中各工艺参数对HAP粉末的影响作了研究，从而确定出最佳的工艺参数。通过XRD检测，说明所得粉末为纯净的HAP；并对粉末的粒径进行了粗略计算，结果表明，晶体的平均结晶尺寸在35nm左右。在复合镀过程中，研究了镀液的温度和阴极电流密度对镀液稳定性和沉积速度的影响；同时，研究了镀液中HAP的浓度、阴极电流密度、温度、搅拌速度等对镀层中HAP含量的影响，并确定了它们的最佳工艺参数。运用XRD、SEM、EDS、显微硬度检测等手段分析了复合镀层的表面形貌、组织结构、镀层成分、显微硬度、耐磨性等；同时对镀层的结合力、耐蚀性等方面也进行了研究；结果表明，镀层是由Ni和HAP组成；硬度随着镀层中HAP含量的增加而增大；耐磨性比钝Ni镀层要好；耐腐蚀性随着镀层中HAP含量的增加而下降。同时，对复合电沉积机理进行了分析，结果表明，微粒的ζ电位、有效电荷密度和电极与溶液界面间的场强对复合电沉积有很大的影响；两步吸附机理能够较好的解释复合电沉积的实质。更多还原

【Abstract】 The deposition of Ni and HAP on the stainless steel substrate was studied in this paper. The stainless steel contains Cr and the more austenite element Ni, having better corrosion resistance, higher plasticity and easier processing, as well not poisonous, and it had already been applied on the medical treatment extensively. Although the investigations on plating on the stainless steel have widely been carried on both home and abroad, the research about deposition Ni-HAP composite coating on the stainless steel was less. Some valid processing treatments were used in order to make the binding strength of the layer and the stainless steel better, and make it possible to apply them to the medical fields.Firstly, the influence of the technological parameters on the preparation of the HAP powder was investigated. The XRD examination indicated that the powder was the pure HAP. An approximately calculation for the particle diameter showed the average size of particle diameter of crystal is 35 nm or so.The influence of the temperature and the cathode electric current density on the stability of plating solution and the deposition speed have been studied.Meanwhile, some processing parameters ,such as the concentration of HAP in plating solution, cathode electric current density, temperature of solution, mixing speed, the HAP content in layer etc.,have been studied and the optimum parameters were obtained.The micro-structure, micro-hardness, wear resistance, etc., of the coatings were analysed by XRD, SEM, EDS and other instruments. Moreover, the binding strength and corrosion resistance of coatings were also studied. The results indicate that the layer is composed of the Ni and the HAP. The hardness increases with the increasing of the HAP content in the layer; Wear resistance is better than the coating of Ni; Corrosion resistance become badly with the increasing of the HAP content in layer.In addition, the mechanism of composite deposition was preliminarily discussed.The results indicate that theζelectric potential of the particle, the valid charge density and the strength of electric field between the electrode and the interface have significant influence on the composite electricity depositions; The Two- Step adsorb mechanism can satisfactorily explain the nature of composite electricity deposition.更多还原