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首页> 美国卫生研究院文献>Science and Technology of Advanced Materials >Effect of Ni W and Mo on the microstructure phases and high-temperature sliding wear performance of CoCr matrix alloys
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Effect of Ni W and Mo on the microstructure phases and high-temperature sliding wear performance of CoCr matrix alloys

机译：NiW和Mo对CoCr基合金的组织相和高温滑动磨损性能的影响

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摘要

CoCrNi, CoCrW and CoCrMo alloys were fabricated by powder metallurgy technology. The effect of nickel, tungsten and molybdenum, as alloying elements, on the microstructure, phase, mechanical and high-temperature tribological properties of CoCr matrix alloys were systematically studied. The wear and friction behaviors were investigated from room temperature (23 °C) to 1000 °C. The alloys were found to contain different ratios of γ(fcc) and ε(hcp) phases; Ni stabilized γ(fcc), while W and Mo stabilized ε(hcp). The hardness measurements showed that the strengthening effect increased with the addition of Ni, W, and Mo, respectively. Addition of Mo and W resulted in the lowest and highest friction coefficients with the addition of Ni resulting in a friction coefficient between the two. The wear and friction behaviors of the three alloys depended on the phase, alloying elements and oxidation from room temperature to 1000 °C. Coefficients of friction of the alloys were not directly correlated with the wear rates. CoCr matrix alloys reinforced with Mo showed the highest hardness and the best high-temperature tribological performance. It was attributed to the high hardness, stable oxide film, and in situ formed high-temperature solid lubricants. With an increase in temperature, the wear mechanism was found to change from abrasive wear to oxidative wear.
机译：通过粉末冶金技术制造了CoCrNi，CoCrW和CoCrMo合金。系统地研究了镍，钨和钼作为合金元素对CoCr基合金的组织，相，力学性能和高温摩擦学性能的影响。研究了从室温（23°C）到1000°C的磨损和摩擦行为。发现该合金含有不同比例的γ（fcc）和ε（hcp）相。 Ni使γ（fcc）稳定，而W和M​​o使ε（hcp）稳定。硬度测量结果表明，分别添加Ni，W和Mo可以增强强度。 Mo和W的添加导致最低和最高的摩擦系数，而Ni的添加导致两者之间的摩擦系数。三种合金的磨损和摩擦行为取决于相，合金元素和从室温到1000°C的氧化程度。合金的摩擦系数与磨损率没有直接关系。 Mo增强的CoCr基合金具有最高的硬度和最好的高温摩擦性能。这归因于高硬度，稳定的氧化膜以及原位形成的高温固体润滑剂。随着温度的升高，发现磨损机理从磨料磨损变为氧化磨损。

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