High-voltage resistant casting copper alloy

Abstract

The present invention is one kind of high pressure cast copper alloy, and belongs to the field of non-ferrous metal material technology. The alloy has the chemical composition of ZCuSn3Zn8Pb6Ni1 added with Fe and Co, and consists of Sn 2.0-4.0 wt%, Zn 6.0-9.0 wt%, Pb 4.0-7.0 wt%, Ni 0.5-2.5 wt%, Fe 0.1-7.0 wt%, Co 0.5-7.0 wt% and Cu for the rest. Its smelting and casting process includes the following steps: feeding electrolytic copper or returned copper material, Pb and Sn into the furnace, adding protective cover and heating, adding Fe, Co and Ni after reaching 1200 deg.c, adding Zn after reaching 1250 deg.c and maintaining for0.5 hr, maintaining at 1250 deg.c for one other 10-15 min, skimming and casting at 1200 deg.c, cooling the casting to room temperature, heating to 800-1000 deg.c and maintaining of 3-5 hr, and water cooling and solid solution treatment. The cast copper alloy has refined crystal grain structure and high tensile strength.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal materials, in particular to a high-pressure resistant cast copper alloy. Background technique [0002] Tin bronze is mainly used as a casting alloy, which has high strength and elongation, and has good wear resistance and corrosion resistance. It is widely used in bearings, pump bodies and impellers, propellers, valves, sealing rings, gears, and automobile synchronization. Gear rings and other components. The main alloying element of tin bronze is tin, whose atomic radius is about 10% larger than that of copper, and its solid solubility in copper is very small, only about 1.3% at room temperature, but it can reach a maximum solid solubility of 25.5% at 798°C . Under general casting conditions, when the tin content is less than 7%, the tin bronze is a single-phase α structure. With the increase of the tin content, its strength increases, its plasticity is better, and it can be cold-worked, but wh...

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Problems solved by technology

At present, the ZCuSn3Zn8Pb6Ni1 tin bronze (i.e. 3-8-6-1 tin bronze) used in my country's current standards has the characteristics of small shrinkage and good fluidity, and is suitable for manufacturing castings with uneven thickness and complex shape. ZCuSn3Zn8Pb6Ni1 tin bronze has coarse grains due to the casting structure (the maximum can reach 3-4mm under sand casting conditions), and at the same time, due to the presence of low-melting lead in the grain boundaries, the strength is low (the tensile strength is generally 180-230MPa, and the yield strength is generally 180-230MPa. 125 ~ 140MPa), castings are prone to leakage when used under high pressure conditions, and are only suitable for manufacturing castings with a pressure resistance not higher than 5MPa

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