Thermodynamic principle and properties of electroplated RE-Ni-W-P-B4C composite coatings
来源期刊：中国有色金属学报(英文版)2007年增刊第1期(Part ⅡB)
论文作者：朱诚意 李光强 秦庆伟 马国军
文章页码：878 - 885
Key words：RE-Ni-W-P-B4C coatings; microstructure; micro-hardness; wear resistance; high temperature oxidation resistance
Abstract: The φ－pH diagram of Ni-W-P-H2O system at 298.15 K, 10 1325 Pa was plotted by thermodynamic calculation software FactSageTM 5.1. The results show that tungsten and phosphorus can be co-deposited with nickel in type of Ni4W, Ni3P, Ni5P2, respectively. XRD analysis shows that the main phase of RE-Ni-W-P-B4C coatings is amorphous as deposited. After heated at 673 K for 3 h, part phases change to crystalline which are Ni, Ni3P, P, W, Ni3C, Ni3B, CeO2. SEM shows the micrograph of the coatings is even and the solid particles scatter well. The thickness of the coating is 2 219 μm after electroplating for 96 h. The micro-hardness of the coatings is HV 825-HV 1 097 as-deposited and increases to HV 1 236 after heat treated. The wear resistance of the coatings is good and the friction coefficient changes from 0.10 to 0.33 during the abrasion process. The resistance to oxidation of the composite coatings is better than Ni-W-P alloy coatings and worse than that of RE-Ni-W-P-SiC coatings.
基金信息：the Scientific Research Key Foundation of Wuhan University of Science and Technology, China
