Volume 33 Issue 07
Jul.  2007
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Zhou Wei, Zhao Yuguang. Low oxygen partial pressure self-fusing Al-Si coating formed on surface of Ti alloy and its oxidation resistance[J]. Journal of Beijing University of Aeronautics and Astronautics, 2007, 33(07): 865-868. (in Chinese)
Citation: Zhou Wei, Zhao Yuguang. Low oxygen partial pressure self-fusing Al-Si coating formed on surface of Ti alloy and its oxidation resistance[J]. Journal of Beijing University of Aeronautics and Astronautics, 2007, 33(07): 865-868. (in Chinese)

Low oxygen partial pressure self-fusing Al-Si coating formed on surface of Ti alloy and its oxidation resistance

  • Received Date: 28 Jun 2006
  • Publish Date: 31 Jul 2007
  • An Al-Si fusing coating was successfully produced by means of the low oxygen partial pressure high-temperature fusing technique for the improvement of the high-temperature oxidation resistance of Ti-6Al-4V alloy. Unlike the Si-modified aluminide coating, this technique is much effective and cheap without the need for long time diffusion for the formation of the Al-Si fusing coating, and the concentrations of the oxidation-resistant elements, Al and Si, in the coating can be controlled by adjusting powder mixing ratio. X-ray diffraction(XRD) shows that the Al-Si fusing coating is mainly composed of Ti5Si3 and TiAl3 phases. Cyclic oxidation tests at 923K for 52h in air reveals that the mass gains of the low oxygen partial pressure self-fusing Al-Si coating (LOPPF) is rapid in the initial 10h oxidation and keeps slow in the following oxidation; However, for the Si-modified aluminide coating, it keeps a rapid oxidation rate throughout the oxidation time.

     

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