Effect of molybdenum disilicide addition on the silicon infiltration of graphite
In this paper,graphite samples were melt infiltrated by silicon powder or silicon powder mixed with molybdenum disilicide powder.The effects of molybdenum disilicide addition on the structure and composition of the material were characterized by scanning electron microscopy,energy dispersive spectrometer and X-ray diffractometer.The results show that molybdenum could enter the graph-ite matrix and eliminate the free silicon content in the matrix.The molybdenum element is distributed in the form of molybdenum disili-cide in the region surrounded by the silicon carbide diffusion reaction layer.The bending strength and bending modulus of graphite infil-trated with silica powder are(115±10)MPa and(24±0.3)GPa,respectively.The bending strength and bending modulus of the sam-ple treated with the mixed powder of silicon powder and molybdenum disilicide are(119±6)MPa and(24±1.3)GPa,respectively,indicating that the addition of molybdenum disilicide has no obvious effect on the properties of the sample.
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