新型置换法制备Ni涂覆SiC颗粒
来源期刊：中南大学学报(自然科学版)2001年第2期
论文作者：李云平 于澍 李溪滨
文章页码：161 - 164
关键词：化学涂层;置换法;涂层粉末;表面活性剂;表面形状因子
Key words：chemical coating; transpositional method; coated particulates; surface active agent; coefficient of surface and shape
摘 要：应用自行设计的新型化学涂层工艺(置换法),对粉末表面进行预处理后,采用自配亲水性溶液对被涂颗粒(SiC)进行表面预处理,改善了涂层金属与颗粒基体的结合状况,与未经亲水性处理的普通置换法相比,新型化学涂层工艺得到了较光滑、致密的Ni涂SiC粉末.实验进一步分析了涂层反应温度、表面活性剂、涂层助剂(乙酸)等因素对涂层效果的影响,结果表明:随着涂层反应温度的升高,涂层沉积速率明显加快,但涂层致密度降低;适量的表面活性剂与涂层助剂对涂层效果有积极的作用.试验选定涂层反应温度90℃、适量聚乙二醇和乙酸的工艺条件进行涂层研究,对涂层含量、涂层厚度进行了控制与计算,得到了粉末厚度、涂层粒度、粉末表面形状因子之间的定量关系.对涂层反应的热动力学原理进行了分析研究.
Abstract: The process of using a new powder chemical coating (transpositional coating) to produce Nickel-coated SiCparticulates has been studied. After the treatment of SiC particulates by active solution the Nickel coatings is very smooth and well-knit. The paper has also studied the effects of the temperature of chemical coating, surface active agent and CH3COOH on the coating. The results showthatwith the higher temperature there would be the higher deposite rate and the lower coating density. Suitable surface active agent and CH3COOH have positive effects on coating. Fix relationship among the coatings thickness, the particle granularity and the coefficient of surface and shape has been studied.
