Effects of Y and Ce on Microstructures and Properties of Nb-Si System Composites
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第1期
论文作者：Xiao Chengbo Han Yafang Song Jinxia Qu Shiyu Song Liguo
Key words：Nb- Si; microstructure; property; rare earths;
Abstract: 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 NbSi 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.
Xiao Chengbo1，Han Yafang1，Song Jinxia1，Qu Shiyu1，Song Liguo1
(1.Beijing institute of aeronautical materials, Beijing 100095, China)
Abstract: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 NbSi 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.
Key words:Nb- Si; microstructure; property; rare earths;
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