铝青铜ZCuAl9Fe4Ni4Mn2材料的熔铸特性

Smelting-casting Characteristics of Bronze CuAl9Fe4Ni4Mn2

选用耐腐蚀材料铝青铜ZCuAl9Fe4Ni4Mn2应用于船用螺旋桨的制造,采用CO2-水玻璃砂造型,用中频炉和工频炉多炉熔炼,比反射炉熔炼具有含气量少,氧化烧损小的特点,一般可降低烧损率3%左右,多包底注式浇注,一次性浇注铜液质量达120t,浇注时尽量减少二次氧化,为达到螺旋桨毂顺序凝固,在浇注到冒口1/3处时,采用添加高温铜液,以利于补缩,通过以上的方法可以生产了同合格的螺旋桨。

The impeller for ship was manufactured with corrosion-resistance ZCuAl9Fe4Ni4Mn2 alloy.Compared to smelt by reflection furnace,the ZCuAl9Fe4Ni4Mn2 alloy smelted by main frequency furnace and industrial frequency furnace and using Al_2O_3 as substrate can realize low gas content and reduce oxidation burning loss to about 3%.Once-through pouring liquid Cu can reach 120 tons through multi-ladle pouring,in which it is necessary to reduce second-oxidation during pouring.To obtain the direction solidification microstructure of impeller,the elevated liquid Cu was used to feed the runner,which is helpful to the feeding when the liquid Cu reaches the distance from 1/3 runner.Using the above-mentioned measures,the qualified impeller can be successfully manufactured with the CO_2-sodium silicate mold.