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前言贵州汽车制造厂生产的EQl40东风铝活塞,由zLl08合金经金属型浇注获得毛坯。原采用四氯化碳(CCl4)作精炼剂,以三元变质剂(冰晶粉Na_3A1F_6、氯化钾KCl、氯化钠NaC1)进行变质处理。生产中存在三个问题:①四氮化碳精炼过程中产生C1_2、AlCl_3等有毒气体,污染环境;②由于按传统工艺先精炼后变质,故变质过程中合金的氧化吸气无法消除,所以铸件一般只能达到4～6级,③变质效果不甚理想,常发现较粗大的共晶硅(图
Preface Guizhou Auto Manufacturing EQl40 Dongfeng aluminum piston produced by zLl08 alloy obtained by casting metal blank. The original use of carbon tetrachloride (CCl4) as a refining agent, ternary metamorphic agent (ice crystal powder Na_3A1F_6, potassium chloride KCl, sodium chloride NaC1) metamorphic treatment. There are three problems in the production: ① carbon tetrachloride refining process produces C1_2, AlCl_3 and other toxic gases, polluting the environment; ② due to the traditional process of refining after the first metamorphism, so metamorphic oxidation of the alloy can not be eliminated, so the casting Generally only reach 4 to 6, ③ metamorphism less than ideal, often found coarser eutectic silicon (Figure