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内燃机活塞可用AЛ25和AЛ30铝合金制造,但是这类合金制造的活塞,在强化规范下,不能满足所要求的可靠性。 为了保证活塞合金所必须的性能,可在合金中加入散状的铝氧化物微粒,制备成含7～12％Al_2O_3(按质量比)的中间合金,作为一般配料使用,不用改变现有的熔炼和浇铸工艺。但这种中间合金的熔化速度与已知的Al-Cu及Al-Si中间合金的熔化速度不同,而合金中 Al_2O_3微粒的被吸收量可以达到计算值的90～95％,并能在溶液中均匀分布。用光栅电子显微镜分析中间合金的显微试层表明,Al_2O_3微粒大小为0.1～5微米,在液态下保温时也不会长大。
Internal combustion engine pistons are made of A 25 and A 30 aluminum alloys, but pistons made of this type of alloy, under the enhanced specifications, do not meet the required reliability. In order to ensure the necessary performance of the piston alloy, it is possible to add bulk aluminum oxide particles into the alloy to prepare an intermediate alloy containing 7-12% Al 2 O 3 (by mass ratio), which is used as a general ingredient without changing existing smelting And casting process. However, the melting rate of the master alloy is different from that of the known Al-Cu and Al-Si master alloys, and the amount of absorption of the Al 2 O 3 particles in the alloy can reach 90-95% of the calculated value, Evenly distributed. Analysis of the microstructure of the master alloy by a grating electron microscope shows that the particle size of Al 2 O 3 particles is 0.1 to 5 μm and does not grow when incubated in a liquid state.