【作者】 张琦；

【导师】 程旭东；

【作者基本信息】 武汉理工大学 ， 材料学， 2010， 硕士

【摘要】 水润滑采用海水或者淡水作为工作介质,具有不燃、无污染等优点,在某些发达国家已经在食品、医药、海洋开发、水下作业工具等方面获得广泛应用。相对矿物油而言,纯水的腐蚀性强、润滑性差,水润滑条件下所使用的材料除了要求足够的机械性能外还必须具有较好的耐腐蚀、耐磨和抗生物污损性能。本实验通过在金属基体上喷涂复合陶瓷涂层来提高元件的耐磨性能和耐腐蚀性能,并通过添加抗污成分来提高其在海水中的抗生物附着污损性能。本次实验以Cr2O3、TiO2和CuO为主要成分制备了P7418粉末,采用喷雾干燥法制成球形团聚粉末,将该粉末进行焙烧,获得流动性好的喷涂用粉,将其与市售的P7412粉末进行对比实验。对喷雾干燥工艺制备的P7418粉末样品进行形貌观察发现该粉末呈球形,具有比P7412粉末更好的流动性,能够满足等离子喷涂的要求。通过对两种粉末的XRD分析发现,所制备的粉末的成分未发生改变,这是由于喷雾干燥工艺制备粉末仅为原料通过粘结剂的简单混合,在制备过程中不会发生相变。采用等离子喷涂工艺,在不锈钢基体上喷涂了色泽均匀的P7412和P7418涂层。在此基础上,我们对以上两种涂层进行复合结构设计,并且制备了复合P7418涂层。通过对三种涂层的腐蚀实验可以知道：P7418涂层的孔隙率比P7412涂层中的略低,且两种涂层中各组分分布均匀；由于CuO在腐蚀介质中的释放会在陶瓷涂层中增加孔隙,末封孔的P7418涂层在10%HCl、10%NaOH和10%NaCl三种腐蚀液中的耐腐蚀性能比未封孔的P7412涂层的略差,但CuO的加入可以起到防止生物附着污染的效果。添加封孔剂不仅可以减少陶瓷涂层的孔隙率,还可以大幅度提高陶瓷涂层的耐腐蚀性能。而复合P7418涂层可以在保留P7418涂层很好的抗生物附着污染性能的情况下,具有和P7412相近的耐腐蚀性能。根据对P7412涂层和复合P7418涂层的电化学分析可以知道,复合P7418涂层的腐蚀倾向比P7412涂层大,但其腐蚀电流与P7412涂层相近,这也证明了涂层的复合结构设计达到了研究目标。更多还原

【Abstract】 Water lubrication, with sea water or fresh water as its working medium, is outstanding as its non-combustible, non-polluting feature, etc, which has been widely used in some developed countries in the fields of food factory, medical equipments or in special situations like ocean exploitation, under water operating system, etc. Besides enough mechanical strength, materials must have high resistance to corrosion and wear, low frictional coefficient and anti-adhesion of the microorganism, because of the specific physical and chemical characteristics of water, which has high corrosion and low lubricating ability in contrast with mineral oil as working medium. In this experiment, we try to improve the wear resistance and corrosion resistance of the components by spraying composite ceramic coating on the metal substrate, as well as improve its anti-adhesion of the microorganism properties by adding anti-adhesion composition.In this experiment, we make P7418 powder with Cr2O3, TiO2 and CuO as its the main composition, we make it into spherical powder by spray drying, then bake it to obtain the powder with good liquidity,which is prepared to be compared with the commercially available P7412 powder. If you examine the samples of P7418 which is made by spray-dried powder morphology, you will find that the powder is spherical, and is better in liquidity than P7412, it can meet the requirements of plasma spraying. The XRD analysis of the two powders shows that the compositions of the powders have little changes for the spray drying technology of the powder is only a simple mixture of the powder by agglomerants.By plasma spraying, we got the P7412 and P7418 coatings with uniform color on the stainless steel substrate. And then, we made composite structure design of these two kinds of coatings, and prepared the P7418 composite coating. These three kinds of experiments on corrosion coating come to the conclusion that P7418 coating porosity is slightly lower than that of the P7412, with the two components in the coating uniformity. As the release of CuO in the corrosive media will increase the porosity in the ceramic coating, the corrosion resistance of the unsealing P7418 coating in 10%HCl,10%NaOH and 10%NaCl is worse than that of P7412. However, the addition of CuO can serve to prevent the anti-adhesion of the microorganism properties. Adding a sealing treatment can not only decrease the porosity of ceramic coatings, but also greatly improve the corrosion resistance of ceramic coatings. When a good anti-adhesion performance of attachment of P7418 composite coating is kept, composite coating have similar corrosion resistance.The electrochemical analysis of P7418 composite coating and P7412 coating shows that P7418 composite coating has higher corrosion tendency than P7412 coating, but similar corrosion current. This also proves that the composite structure design of the coating has already achieved the goal.更多还原