钼镍镀层的制备及其光谱性能（英文）

Preparation of Electrodeposited Mo-Ni Coating and Its Spectral Properties

采用电沉积法在镍合金表面制备钼镍镀层。研究钼镍镀层的硬度、磨损质量和摩擦系数、热膨胀等性能。分别用发射光谱法、能谱法、扫描电镜法和X衍射法等对钼镍镀层进行表征。在镍合金表面镀上一层钼镍镀层，可使其的硬度和耐磨性大幅度提高并减小磨擦系数，钼镍镀层的硬度为518HV，比镍合金的硬度（300HV）提高了72.67％；钼镍镀层的磨损质量是镍合金的磨损质量的1/1.94；镍合金和钼镍镀层的磨擦系数分别为0.640和0.559。镍合金的物理热膨胀曲线在100～120℃温度范围和570～640℃范围形成了2个峰，镍合金＋钼镍镀层的物理热膨胀曲线在570～640℃范围形成了1个峰。在570～640℃范围可明显改善其热膨胀，镍合金＋钼镍镀层的物理热膨胀曲线在570～640℃范围形成的峰远比镍合金的物理热膨胀曲线在570～640℃范围形成的峰小，可能是因为钼进入到镍的晶格中，抑制了镍在570～640℃范围发生晶格转变（bcc→fcc）所致。镍合金＋钼镍镀层的物理热膨胀曲线在595～625℃范围形成的小峰，可能是由于MoNi4和MoNi由半晶型结构转变为晶型结构所致。

Mo-Ni coatings were prepared on Ni alloy by electrodeposition method .The properties of micro-hardness ,wear weight loss and friction coefficients ,and thermal expansion of the coatings were investigated , respectively .Mo-Ni coatings were characterized with inductively coupled plasma-atomic emission spectroscopy （ICP-AES） ,energy-dispersive analyses of X-ray （EDAX ） ,scanning electron microcopy （SEM ） ,and X-ray diffraction （XRD） techniques ,respectively .Mo-Ni coating shows higher microhardness ,lower wear weight loss and friction coefficient compared with those of Ni alloy .The microhardness of Mo-Ni coating is as high as 518 HV ,which is 72.67% higher than that of the Ni alloy （300 HV） .The wear weight losses of Mo-Ni coat-ing is 1.94 times lower than that of Ni alloy .The friction coefficient of Ni alloy and Mo-Ni coating are 0.640 and 0.559 respectively .The physical thermal expansion curve of Ni alloy has two the peaks in the ranges of 100~120 and 570~640 ℃ respectively ;and that of Ni alloy＋Mo-Ni coating has one the peaks in the ranges of 570~640 ℃ .The peak of the physical thermal expansion curve of Ni alloy＋Mo-Ni coating in the ranges of 570~640 ℃ is much smaller than that of the Ni alloy .Because the part of nickel was replaced by molybdenum in the Ni lattice ,molybdenum decreases the lattices transformation of nickel （bcc→fcc） .The reason for the formation of the small peak of the physical thermal expansion curve of Ni alloy ＋Mo-Ni coating in the ranges of 595~625 ℃ is the changes of MoNi4 and MoNi from the semi-crystalline structure to the crystalline structure respectively .