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نویسندگان مقالات پربازدید :
مواد و طراحی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • microstructure evolution and oxidation behaviour of tif/tial3 composites

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 505
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     in this paper, tif/tial3 composites were fabricated by infiltration–in situ reaction method and its oxidation behaviours were investigated by cyclic oxidation testing at 700 °c, 800 °c and 900 °c. the microstructure evolution and oxidation of tif/tial3 composites were investigated by scanning electron microscopy (sem), x-ray diffraction (xrd) and energy dispersive x-ray diffraction (edx). the reaction between ti3al particles and al was more violent than that of ti fibres and al. ti3al/al reaction consumed a large amount of al and inhibited the reaction of ti fibres indirectly. reactant of ti fibres was tial3 at 700 °c, and four reaction layers surrounding ti fibre (ti3al, tial, tial2 and tial3 from inner to outside) were observed above 800 °c. the thickness of the total reaction layers increased little with temperature and time, while the thickness of inner reaction layers increased remarkably. a model corresponding to the microstructure evolution process was drawn schematically. oxidation resistance of tif/tial3 composites decreased with increasing of temperature, and changed from cubic law at 700 °c to parabolic law at 900 °c. the oxidation weight gain of tif/tial3 composite was dominated by the exposed ti fibres. due to outward diffusion of ti and al element, the oxide of ti fibre at 900 °c changed to mushroom-shape. fortunately, when tial3 was oxidized, a thin and continuous al2o3 layer was formed, protecting matrix from further oxidation.

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