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用电沉积法制备复合镀层是近年来表面工程的一项新技术,它使制件表面获得高温条件下的耐磨、减摩和某些特殊功能方面,显示出很大的优越性。其中尤以镍为基体的复合镀层使用得最为普遍。在高温条件下大气中使用的复合镀层,必须具有优良的抗氧化性。因为复合镀层中含一定量的分散相,既改善基体金属的某些性质,同时也破坏了基体金属的化学均一性,从而影响着镀层的抗氧化能力。本文选择Ni-B_4C、Ni-TiC、Ni-ZrO_23种复合镀层,探索在高温下氧化行为的特征。
The preparation of composite coatings by electrodeposition is a new technology of surface engineering in recent years. It shows great superiority in the aspects of wear resistance, friction reduction and some special functions of workpiece surface under high temperature conditions. Among them, nickel-based composite coatings are most commonly used. Composite coatings used in the atmosphere at high temperatures must have excellent oxidation resistance. Because the composite coating containing a certain amount of dispersed phase, both to improve some properties of the base metal, but also undermined the chemical homogeneity of the base metal, which affects the oxidation resistance of the coating. In this paper, Ni-B_4C, Ni-TiC, Ni-ZrO_23 composite coatings were selected to explore the characteristics of oxidation behavior at high temperature.