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| Certification: | ISO |
| Shape: | Block |
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Aluminum-copper alloys are very hard, with a melting point of 640ºC, and are generally made up of 97% aluminum and 3% copper. Chemically similar to the metal aluminum. Light and high tensile strength. Can replace expensive copper wire for wire.
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Al-Cu alloy is the earliest cast aluminum alloy used in industry. Its main properties are high mechanical properties at room temperature and high temperature, simple casting process, good machining performance, excellent heat resistance, is the basis for the development of high strength aluminum alloy containing Cu and various heat resistant alloys. The disadvantages of solid solution alloy are poor casting performance, large potential difference between copper-rich matrix, low corrosion resistance and high density.
Aluminum-copper alloys are very hard, with a melting point of 640ºC, and are generally made up of 97% aluminum and 3% copper. Chemically similar to the metal aluminum. Light and high tensile strength. Can replace expensive copper wire for wire.
Aluminum copper aluminum alloy can be made into sheet, profiles, forgings, wire, bar, tubing, foil, aerospace structural parts, welding rod solder, mechanical processing products, engine piston wheels and so on.
Aluminum - copper binary alloy is easier to manufacture than other cast aluminum alloys.
The alloy can be smelted in crucible, flame-reflecting furnace and electric furnace of various structures. Aluminum-copper alloys are not as prone to gas absorption as aluminum-silicon alloys, and are not as prone to oxidation as alloys with high magnesium content.
Aluminum ingots of grade A3 and below and Grade 3 (M3) copper of 'F are used as the charge for the aluminum-copper alloy. Copper is added to the aluminum - copper alloy as an aluminum - copper intermediate alloy.
Aluminum copper eutectic alloy with 33% copper has all the properties of excellent intermediate alloy: it can be made into fusible (melting point 540ºC) and brittle alloy with uniform chemical composition.
However, alloys containing 50% copper have greater advantages. At low melting point (575ºC) and sufficient brittleness, the alloy is homogeneous.
Aluminum-copper intermediate alloys can be made in three possible ways: (1) mixing molten aluminum and copper; (2) dissolved copper in molten aluminum; (3) Dissolve aluminum in molten copper. Of the three methods, the third method is the most practical, because it is simple and ensures that the intermediate alloy is of good quality.
The method of dissolving copper in molten aluminum and the method of mixing molten metal make the intermediate alloy easily contaminated by non-metallic impurities due to the intense overheating of the molten substance.
The addition of preheated solid copper or molten copper to the molten aluminum causes the temperature to rise significantly due to the release of the formation heat of the aluminum-copper alloy.
Mixing separately melted metals together, in addition to superheating the alloys, complicates the production process by requiring the use of two furnaces, crucibles, etc. However, when a large number of intermediate alloys are fused in a large foundry, this method has some application significance. In this method, the copper and component aluminum are melted separately under the charcoal cladding. Molten copper is injected into the molten aluminum in a small stream, and the remaining solid aluminum is added in separate batches to reduce the temperature of the smelt.
When solid aluminum is dissolved in liquid copper, the heating temperature of the melt decreases significantly. This is because the heat capacity and latent heat of melting of copper is higher than that of copper.
However, the possibility of local overheating of the smelt cannot be avoided when using this force method. To avoid local overheating, aluminum is added deep below the surface of the molten pool and dissolved in liquid copper.
The method of dissolving solid copper into molten copper to make Al-Cu intermediate alloy is summarized as follows: all the copper is put into the furnace and 10~15% of all the charge aluminum is added in order to accelerate the melting of copper. As the copper melts, the aluminum is gradually added in small amounts, adding the aluminum to the depth of the molten pool and mixing the molten material at this time. Aluminum ingots should be preheated to 150~200ºC. After all the aluminum is dissolved, the alloy is smelted to 700ºC and refined with zinc chloride. The slag is removed and the resulting intermediate alloy is cast in a preheated ingot mold at 680~700ºC. When the intermediate alloy solidifies in the ingot mold, the film generated on the surface is removed by the ladle to facilitate the release of gas from the metal during solidification and the removal of non-metallic dirt on the surface.
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