【摘要】 研究了电镀工艺条件对Ni SiC纳米复合镀层耐高温氧化性能的影响规律。研究表明,经800℃,1.5h灼烧,随着镀层中SiC复合量的增加,复合镀试片总增重略降后上升至最大,后又再下降,对基底金属Fe的耐高温氧化的保护作用先增后减。最佳工艺条件下获得的纳米复合镀试片总增重比Watts镀试片减少1 4,镀层本身的耐高温氧化性能有所增强,而源自基底金属Fe的氧化增重减少近2 3,对基底金属的保护作用明显增强;显微硬度测试表明,灼烧后镀层表面形貌发生了很大的变化,原来结晶细小的蜂窝状结构消失,结晶粗大的瘤状突起明显增多,但显微硬度没有发生明显变化。更多还原

【Abstract】 Pyro-oxidation resistance of Ni-SiC nano-composite deposits electroplated under different plating conditions was studied in this paper. With the inclusion of SiC in the deposits, the weight of the specimen after incandescence at 800℃ through 1.5h increased after a little declination and then decreased again, while the pyro-oxidation of the substrate Fe enhanced after a sensitive retarding. Under optimum conditions, the nano-composite plated samples weighed 1/4 lighter than the Watts ones. Pyro-oxidation resistance of the deposit itself was enhanced and thus the protection of substrate was reinforced. The weight of the substrate Fe resulted from pyro-oxidation reduced to almost 2/3. The surface morphology of the layer turned from fine crystalline cellular structure to macrocrystalline nodular structure after incandesce, but no changes in microhardness were observed.更多还原