Qu Shiyu Han Yafang Song Jinxia Xiao Chengbo Song Liguo (Beijing institute of aeronautical materials, Beijing 100095, China)
<正> The effects of yttrium and cerium on microstructures and properties of Nb-Si system composites were investigated by scanning electron microscopy(SEM), energy dispersive spectrum (EDS), X-ray diffraction(XRD) and high temperature oxidation experiments. It is found that the coarse primary silicide phase became finer and more homogeneous with Y and Ce addition. The results of high temperature oxidation experiments show that the oxidation rates of Nb Si system composites with an appropriate amount of Y and Ce decrease compared with those of alloys without Y or Ce addition, and oxidation products mainly distribute along the phase boundaries between the Nb solid solution and silicide.
Nb-Si; microstructure; property; rare earths
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