• effect of cup and ball types on alumina–tungsten carbide nanocomposite powder synthesized by mechanical alloying

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1393/01/01
    • تاریخ انتشار در تی پی بین: 1393/01/01
    • تعداد بازدید: 603
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     alumina-based nanocomposite powders with tungsten carbides particulates were synthesized by ball milling wo3, al and graphite powders. x-ray diffraction (xrd) was used to characterize the milled and annealed powders. microstructures of milled powders were studied by transmission electron microscopy (tem). results showed that al2o3–w2c composite formed after 5 h of milling with major amount of un-reacted w in stainless steel cup. the remained w was decreased to minor amount by increasing carbon content up to 10 wt.%. when milled with zro2 cup and balls, al2o3–w2c composite was completely synthesized after 20 h of milling with the major impurity of zro2. in the case of stainless steel cup and balls with 10 wt.% carbon, fe impurity after 5 h of milling (maximum 0.09 wt.%) was removed from the powder by leaching in 3hcl·hno3 solution. the mean grain size of the powder milled for 5 h was less than 60 nm. the powder preserved its nanocrystalline nature after annealing at 800 °c.

سوال خود را در مورد این مقاله مطرح نمایید :

با انتخاب دکمه ثبت پرسش، موافقت خود را با قوانین انتشار محتوا در وبسایت تی پی بین اعلام می کنم