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湖南大学、长沙正园动力配件厂、中南矿冶学院、江苏沙洲熔剂厂四单位最近研制成一种活塞用铝硅合金 SR-813磷复合变质剂。其工艺要点是:在预定的变质温度(共晶合金为780℃～800℃,过共晶合金为820～840℃)下,用深筒形钟罩将给定量的变质剂(共晶合金占铝液重的0.08～0.1%,过共晶 Al-20Si 合金为0.8～1%,Al-23%Si 合金为1%)分次压入坩埚底部,静置8至10分钟,精炼后,共晶合金,过共晶 Al-20%si
Hunan University, Changsha is Park Power Parts Factory, Central South Mining and Metallurgical Institute, Jiangsu Shazhou flux plant four units recently developed into a piston with aluminum-silicon alloy SR-813 phosphorus compound modifier. The main points of the process are as follows: a predetermined amount of degenerate agent (eutectic alloy (including eutectic alloy) is deposited in a deep cylindrical bell jar at a predetermined metamorphic temperature (eutectic alloy of 780 ° C. to 800 ° C. and hypereutectic alloy of 820 to 840 ° C.) 0.08 to 0.1% by weight of aluminum liquid, 0.8 to 1% of hypereutectic Al-20Si alloy, and 1% of Al-23% Si alloy) were press-pressed into the crucible bottom for standstill for 8 to 10 minutes, Crystal alloy, hypereutectic Al-20% si