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轻型汽车发动机缸体多采用 ZL104合金铸造(Al-Si 共晶合金)。本工作采用稀土化合物为原料,以碱金属氟化物和氯化物混盐为熔剂,改变稀土原料中稀土的存在状态和降低体系的初晶点及改善熔体的物理化学性质,以液态铝为还原剂,在熔铝炉内熔化铝过程中直接制备 RE-ZL104合金(RE 代表混合稀土金属)。RE-ZL104合金用于铸造汽车发动机缸体与 ZL104合金比较有如下优点:1.合金晶粒明显细化,合金中硅分布较均匀,富集点少;2.材料的强度和硬度可提高10%左右;3.由于微量稀土元素可以使铝液的表面张力降低,因此填充性好,铸造性能好。通过铸造1060台发动机缸体使用表明,铸件气孔,针孔减少,铸件成品率可提高5～10%。
Light car engine block more use ZL104 alloy casting (Al-Si eutectic alloy). In this work, rare earth compounds are used as raw materials, alkali fluoride and chloride mixed salt as flux, rare earth rare earth materials to change the existence of the state and reduce the primary crystallization point and improve the physical and chemical properties of the melt to liquid aluminum as a reduction RE-ZL104 alloy (RE stands for mixed rare earth metal) is prepared directly during the melting of aluminum in an aluminum melting furnace. RE-ZL104 alloy used to cast automobile engine block and ZL104 alloy has the following advantages: 1. The alloy grain is obviously refined, the alloy is more evenly distributed in silicon and the enrichment point is less; 2. The strength and hardness of the material can be increased by 10 %; 3. Due to the trace rare earth elements can reduce the surface tension of liquid aluminum, so good filling, casting good performance. By casting 1060 engine block shows the use of castings, stomatal, pinhole reduction, the casting yield can be increased by 5 to 10%.