Copper-silicon alloys are alloys of copper and silicon. Usually 8% silicon is contained in the alloy, and a small amount of iron and manganese is added. It is easy to process and weld. Corrosion resistance, especially marine corrosion resistance. It is applied in the form of sheet, strip, bar and casting.
In Copper Silicon alloys, both copper and silicon are refractory elements with high melting point. According to the traditional smelting process, the refractory components are first prefabricated into intermediate alloys (or auxiliary alloys), and then the finished alloys (or working alloys) are melted with intermediate alloys. In this way, every time the finished alloy is melted, there is a part of the furnace charge - Master Alloy to be re-melted. This not only makes the smelting process cumbersome and prolongs the production cycle, but also causes a great waste of manpower and raw materials. If the direct smelting process is adopted, a large number of smelting hours can be saved, fuel and electricity consumption can be reduced, and remarkable economic results will be achieved.In order to ensure the melting quality of the alloy, the mechanical properties, chemical composition and metallographic structure of the samples and castings must be measured during the test. By direct smelting process, the macro fracture structure of the alloy is fine and uniform, and the mechanical properties and chemical composition of the alloy also meet the requirements of the brand.
In the process of smelting, when pure aluminium has just melted and the temperature of molten aluminium is very low (about 700 C below), the crystalline silicon and electrolytic copper in the charge have all melted. Sometimes, even though crystalline silicon and electrolytic copper have been melted, a small amount of pure aluminium remains unmelted. In terms of melting time, direct melting is not longer than the original time. It can be seen that melting high melting point crystalline silicon and electrolytic copper in aluminium water does not need to overheat the aluminium water to a high temperature, nor does it need to increase the melting time. In this way, the oxidation and burning loss of the alloying elements are reduced, and the gas absorption of the alloys is also reduced, which is beneficial to ensuring the melting quality of the alloys.