研究表明,添加稀土Ce的镍铬合金中非金属夹杂物数量显著减少,夹杂物尺寸降低,净化了熔体,有助于改善加工使用性能,但稀土残留量较低最高仅为添加量的32.5%。通过高温寿命实验得出添加Ce有利于Ni80合金的高温快速寿命,且一定范围内含量越高,高温寿命值越高;丝材氧化断口主要是呈发射状的枝晶组织,枝晶臂长达数十微米;高度氧化的丝材断口主要为金属铬、镍的氧化物,还有少量的硅、锰及稀土Ce氧化物。稀土Ce的添加对镍铬合金的重要物理性能参数影响不大。
The observation with optical and electrionic probe microscope showed that the inclusion of Ni80 electrothermal alloy could be modified and the inclusion scale could be minished to less than 5μm.The banding inclusion could be dispelled by rare earth Ce,and numerical measure in alloy could be reduce sharply.And the mechanical working properties could be improved.The experiments showed that high temperature life of Ni80 had deep relationship on rare earth Ce,and Ce component including,the high temperature life including.As the dendritic growing,dendritic brachium could grow to some ten micron.The little effect of resistance rate on Ce had been tested in this paper,at the same time,expansion coefficient had no variation in varied Ce content.
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