内燃机的活塞常用AЛ25和AЛ30(相当于ZL108、ZL109—译者)铝合金制造,但用这类合金生产高速内燃发动机活塞却难以保证所要求的可靠性。因此,研究在合金中加入氧化铝弥散微粒,以含Al_2O_3(重量)7—12％的中间合金形式加入。中间合金作为普通的炉料加入,没有改变原来的熔炼和浇注工艺。中间合金在铝液中的熔化速度与 Internal combustion engine pistons are commonly made from A-25 and A-30 (equivalent to ZL108, ZL109) aluminum alloy, but the use of such alloys to produce high-speed internal combustion engine pistons is difficult to ensure the required reliability. Therefore, it is studied to add alumina dispersion particles to the alloy and add it as an intermediate alloy containing 7% to 12% by weight of Al 2 O 3. Master alloy as an ordinary charge to join, did not change the original melting and casting process. The melting rate of the master alloy in molten aluminum