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83年我厂为西德共生产含镍锡青铜铸件800公斤。铸件为滑块,镶条、铜套之类零件,主要用于轧钢设备上。其化学成份为Sn6.0—8.0％,Zn3.0—5.0％,Pb5.0—7.0％,Ni2.0％,Cu81—85％。这类含Ni2％的锡青铜热稳定性好,使用中不卷边,不起皮,不裂纹,但是,含镍锡青铜在砂型和金属型铸造中易出现气孔。本文介绍了出现气孔的原因和防止方法,供参考。一、为什么含镍锡青铜容易产生气孔在铜镍合金中,Ni对CO和CO_2有很强的化学反应能力。
83 years I plant for the West Germany produced a total of 800 kg of nickel-tin bronze castings. Castings for the slider, inlaid, copper sleeve and other parts, mainly for rolling equipment. Its chemical composition is Sn6.0-8.0%, Zn3.0-5.0%, Pb5.0-7.0%, Ni2.0%, Cu81-85%. Such nickel bronze containing 2% Ni2 + has good thermal stability, does not curl in use, can not afford to hide, and does not crack, however, nickel-containing bronze is prone to porosity in sand and metal castings. This article describes the causes of stomata and prevent methods for reference. First, why easy to produce nickel-bronze stomatal Copper-nickel alloy, Ni on CO and CO_2 have a strong chemical reaction ability.