一年来,我车间职工与沈阳铸造所的同志一起,用氯化铝代氯化铵作制壳硬化剂,经边试验边生产,取得了初步成效,并修订了工艺,稳定了生产。一、硬化机理我们使用的是南票旷务局生产的结晶氯化铝,其化学成分要求:Fe_2O_3<0.1%;Al_3O_3>20%;游离酸=0。它是一种黄色细颗粒结晶,在水中极易 In the past year, my workshop staff and Shenyang Foundry’s comrades worked together with aluminum chloride, ammonium chloride as shell hardener, and produced the preliminary results through the trial production. We also revised the process and stabilized the production. First, the hardening mechanism We use is the Nantong Bureau of Production of crystalline aluminum chloride, its chemical composition requirements: Fe_2O_3 <0.1%; Al_3O_3> 20%; free acid = 0. It is a yellow fine-grained crystal, extremely easy in water