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研究了稀土加入三种电沉积镍基复合镀层Ni—B_4C、Ni—TiC、Ni—ZrO_2前后,在850℃时的氧化行为。通过金相观察、ESCA(光电子能谱)分析及X射线衍射等方法研究表明:镀层中不同的复合颗粒和稀土两者对镀层的抗氧化能力均有影响。其小不同种类的颗粒对镀层抗氧化能力所产生影响的差别很明显;而稀土对镀层抗氧化能力影响的差别较小,且影响的程度比较接近。另外,两者影响的机理也不同。颗粒是通过分解、扩散等过程改变表面膜的组成来影响的,而稀土则是从提高膜的致密度和膜与基体的粘附性来影响的。作者认为,它们的影响既互相独立,而又互相补充。
The oxidation behavior of rare earth with addition of three kinds of Ni-B 4 C, Ni-TiC and Ni-ZrO 2 coatings at 850 ℃ was studied. The results of metallographic observation, ESCA (electron photoelectron spectroscopy) analysis and X-ray diffraction show that the different composite particles and rare earth in the coating all affect the anti-oxidation ability of the coating. The effect of different types of particles on the anti-oxidation ability of the coating is obvious. The difference of the anti-oxidation ability of the coating on the anti-oxidation capacity of the rare earth is relatively small, and the degree of influence is relatively close. In addition, the impact of the two mechanisms are also different. Particles are affected by changing the composition of the surface film by decomposition, diffusion and the like, whereas rare earth is affected by increasing the density of the film and the adhesion of the film to the substrate. According to the authors, their influence is independent and complementary to each other.