• isothermal oxidation behavior of reactive hot-pressed tin–tib2 ceramics at elevated temperatures

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 399
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     isothermal oxidation behavior of reactive hot-pressed tin–tib2 ceramics with various tin/tib2 molar ratios of 2/1, 1/1 and 1/2 was evaluated in the temperature range of 500–800 °c in air. tin–tib2 ceramics have a relative density of 97–98.6%. the oxidation weight gains of tin–tib2 ceramics depend upon the composition, oxidation temperature and exposure time. the structure and morphology of oxidized layers of tin–tib2ceramics were investigated by x-ray diffraction (xrd) and scanning electron microscopy (sem). during isothermal oxidation of tin–tib2 ceramics, anatase and rutile-tio2 form as the oxidized products at 500 °c. however, phase transformation from anatase to rutile occurs at temperatures between 500 and 600 °c, and therefore rutile-tio2 becomes the only crystalline phase after oxidation at temperatures of 600–800 °c for 10 h. the oxidation mechanism was proposed with reference to thermodynamically feasible oxidation reactions. the influence of composition on oxidation behavior of tin–tib2ceramics varies with temperature.

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