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利用高速电弧喷涂技术制备了NiCrBMoFe和NiCrBMoFe/BaF2·CaF2两种复合涂层.两种涂层均含非晶相与纳米晶相,非晶相质量百分数分别达45%和33%.NiCrBMoFe涂层中纳米晶相弥散分布在非晶母相中;NiCrBMoFe/BaF2·CaF2涂层纳米晶相以团聚形态存在.检测了两种涂层的摩擦磨损性能.在常温下,NiCrBMoFe和NiCrBMoFe/BaF2·CaF2两种涂层的摩擦系数分别为0.5和0.375,后者比基体18Cr2Ni4WA的摩擦系数下降了25%,耐磨性能优异.在高温摩擦磨损条件下,NiCrBMoFe/BaF2·CaF2涂层也具有良好的耐磨性能.在450℃左右,涂层中BaF2·CaF2固体润滑相会析出涂层表面,形成一层低摩擦系数的润滑转化膜,使涂层具有良好的减摩润滑作用.
NiCrBMoFe and NiCrBMoFe / BaF2 · CaF2 composite coatings were prepared by high-speed arc spraying technique.The coatings contain both amorphous and nanocrystalline phases with the mass percentages of 45% and 33%, respectively.NiCrBMoFe coating The nanocrystalline phase is dispersed in the amorphous matrix and the nanocrystalline phase of NiCrBMoFe / BaF2 · CaF2 coating exists in the form of agglomeration. The friction and wear properties of the two coatings were examined. At room temperature, NiCrBMoFe and NiCrBMoFe / BaF2 · CaF2 The friction coefficients of the two coatings are 0.5 and 0.375, respectively, the latter is 25% lower than that of the base 18Cr2Ni4WA and has excellent wear resistance. The NiCrBMoFe / BaF2 · CaF2 coating also has good resistance to wear under high temperature friction and wear conditions Grinding performance.At about 450 ℃, BaF2 · CaF2 solid lubricant phase precipitated in the coating surface, forming a low friction coefficient of the lubricating conversion coating, the coating has a good anti-friction lubrication.