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我厂在研制新型活塞用的铝合金中,在现用的活塞材料ZL_3和ZL8內加入稀土、稀土氧化物、铌稀土进行了试验;对过共晶铝硅合金用赤磷以及加锑变质处理也进行了试验。在试验中加赤磷变质处理过共晶合金效果较好,膨胀系数小(20～100℃ 16.375×10~6;20～200℃ 17.165×10~(-6);20～300℃ 18.78×10~6;20～400℃ 18.915×10~(-6)),这与西德KS281合金的膨胀系数(18.5～19.5×10~(-6))和KS282合金的膨胀系数(17～18×10~(-6))以及英国AL—fin铝活塞上镶奥氏体铸铁圈的共晶铝硅合金的膨胀系数(20～100℃ 19.9×10~(-6);20～200℃ 21.3×10~(-6);20～300℃
I plant in the development of a new type of aluminum piston used in the existing piston materials ZL_3 and ZL8 rare earth, rare earth oxides, rare earth niobium were tested; the hypereutectic Al-Si alloy with red phosphorus and antimony modification Also conducted a test. In the experiment, the modification of eutectic alloy with red phosphorus is better, the expansion coefficient is small (20 ~ 100 ℃, 16.375 × 10 ~ 6, 20 ~ 200 ℃, 17.165 × 10 -6, 20 ~ 300 ℃, 18.78 × 10 ~ 6; 20 ~ 400 ℃ 18.915 × 10 -6), which is related to the expansion coefficient (18.5 ~ 19.5 × 10 -6) of KS281 alloy and the expansion coefficient of KS282 alloy (17 ~ 18 × 10 ~ (-6)) and the eutectic aluminum-silicon alloy with AL-fin aluminum piston on austenitic cast iron ring (20 ~ 100 ℃ 19.9 × 10 -6); 20 ~ 200 ℃ 21.3 × 10 ~ (-6); 20 ~ 300 ℃