Aluminum-silicon-magnesium cast aluminum alloy for radiator of air-conditioner and manufacturing method thereof

Abstract

The invention relates to an aluminum-silicon-magnesium cast aluminum alloy for a radiator of an air-conditioner. The aluminum alloy is characterized by comprising the following components: on the basis of weight percentage, 9.5 to 10.5 of Si, 3.40 to 3.60 of Mg, 0.60 to 0.80 of Ti, 0.04 to 0.06 of Sr, 0.08 to 0.12 of Hf, 0.5 to 0.8 of Bi, 0.8 to 1.1 of Ni, 0.2 to 0.3 of Sn, 0.16 to 0.19 of Zr, 0.12 to 0.14 of Li and 0.06 to 0.08 of Ba, with the balance being Al. The aluminum alloy provided by the invention overcomes the problems of low strength and elongation percentage of an aluminum-silicon alloy and poor casting performance and corrosion resistance of an aluminum-copper alloy and an aluminum-zinc alloy and has the advantages of improved tensile strength, toughness and casting performance, low cost, good corrosion resistance and good thermal conductivity.

Description

technical field [0001] The invention belongs to an aluminum alloy, in particular to an aluminum alloy material for an air-conditioning radiator. Background technique [0002] Most of the heat dissipation structural parts of air conditioners are made of aluminum alloy, including castings, extruded parts, stamping parts and forging parts. The cost of aluminum alloy castings is low, but the thermal conductivity of generally cast aluminum alloy structural parts is not high, usually around 90 W / m·K, so that the thermal conductivity is poor. Currently, pure aluminum (purity > 99% or more) is commonly used ), although the thermal conductivity is high (> 220 W / m·K), its fluidity and castability are not good, and it is too soft, difficult to process, and easy to deform. At present, the study of casting aluminum alloys with high thermal conductivity and high strength is very important for air-conditioning radiators. Contents of the invention [0003] The object of the presen...

AI Technical Summary

Problems solved by technology

The cost of aluminum alloy castings is low, but the thermal conductivity of generally cast aluminum alloy structural parts is not high, usually around 90 W / m·K, so that the thermal conductivity is poor. Currently, pure aluminum (purity > 99% or more) is commonly used ), although the thermal conductivity is high (> 220 W / m K), its fluidity and castability are not good, and it is too soft, difficult to process, and easy to deform