Hard aluminum alloy for metal die casting of precision electronic product structural member

Abstract

The invention discloses a hard aluminum alloy for metal die casting of a precision electronic product structural member. The hard aluminum alloy is prepared by antigravity metal die casting and natural ageing heat treatment. The hard aluminum alloy comprises, by mass, 21-30% of zinc, 5.7-7.2% of silicon, 2.0-2.4% of copper, 0.17-0.35% of manganese, 0.2-0.6% of trace alloy element and the balance aluminum and unavoidable impurities with iron content of 0.27% or less. The invention also discloses a preparation method of the hard aluminum alloy. The hard aluminum alloy can be prepared by high precision die casting, has high strength, can be subjected to high quality surface treatment, can be used for production of a high precision structural member of small, thin and light electronic products, and is suitable for large parts of spaceflight and aviation, automobiles, high-speed railway, steamships and yachts and daily hardware products.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a hard aluminum alloy used for metal mold die-casting structural parts of precision electronic products. Background technique [0002] With the rapid development of the electronics industry, the volume, structure, and weight of new electronic products are developing in the direction of small, ultra-thin, and ultra-light, which puts forward new requirements for the materials used to manufacture structural parts of electronic products. [0003] The structural parts of traditional electronic products can basically be divided into two categories from the material point of view, one is plastic material, and the other is metal material. The structural parts of electronic products made of plastic have the disadvantages of low strength and poor heat dissipation effect, which do not meet the technical and performance requirements of small, thin and light new electronic products. Traditionall...

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Problems solved by technology

[0006] In December 1998, a magnesium melting furnace crucible ruptured and leaked in a die-casting factory in Hyogo Prefecture, Japan. A large amount of magnesium liquid flowed out to the machine bed and the ground, and then a fire broke out, and the factory was completely burned down, causing many casualties.

[0007] In March 1999, a molten magnesium leakage accident occurred in a workshop in Mie Prefecture, Japan. The molten magnesium flowed out from the corrosion hole of the crucible, and reacted with the heat-insulating refractory material in the furnace to catch fire, and the workshop burned down.

[0008] On March 20, 2001, the Spanish Dalphimetal Company (manufacturing magnesium alloy auto parts) accidentally generated sparks when cleaning and collecting magnesium scraps, which ignited the magnesium scraps and caused a fire

[0014] At present, aluminum alloys are used as raw materials for electronic product structural parts. Aluminum alloys have low density, light weight, and good thermal and electrical conductivity. However, with the rapid development of digital technology, the thickness and strength requirements of digital product structural parts are getting higher and higher. The higher the thickness, the 0.7mm wall thickness and 320MPa tensile strength of aluminum alloy electronic product structural parts can no longer keep up with the needs of new technologies. In practical applications, the fluidity of this technology cannot meet the requirements of high-precision die-casting. Type aluminum alloys are at a disadvantage in terms of strength and fluidity of molten metal

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