The most harmful residues in the aluminum bronze plate are aluminum, silicon and magnesium. When their composition exceeds 0.005%, the resulting inclusion of SiO2, MgO and Al2O3 metal oxides will pollute the environment and reduce the characteristics of some aspects of the aluminum alloy. .
When smelting aluminum bronze plate, because the melting point of zinc is relatively low and it has great infectivity with oxygen, it should be melted after deamination of the solution. It is beneficial to prevent the risk of manufacturing SnO2. The structure of comprehensive deamination of zinc and phosphorus in the solution, the converted 2ZnO and P2O5 are relatively easy to separate from the solution, and it is beneficial to improve the fluidity of the solution.
The use of dry returning waste, or even the first preheating of the charge before melting, can reduce or even prevent the solution from digesting and absorbing vapors. Appropriate proportions of new metal and process waste are also beneficial for smooth melt quality. The demand for processing waste is generally not suitable to exceed 20% to 30%. The solution that is slightly polluted by the residue can be air-oxidized by blowing gas or by adding a reducing agent (such as copper chloride CuO). Wastes that are seriously polluted by some residual elements can be refined by using organic solvents or rare gases, including remelting and other methods to improve their quality.
Appropriate feeding and melting sequence, including the selection of DC iron-core induction furnace with obvious mixing and melting effect for smelting, are beneficial to alleviating and preventing shrinkage porosity. Adding an appropriate amount of nickel to the solution is beneficial to accelerate the coagulation and crystallization rate of the solution, and has a certain practical effect on alleviating and preventing shrinkage. Similar additives, zirconium and lithium can also be selected. The mixed smelting method of melting copper alloy lead separately and then introducing the lead solution into the copper solution at 1150-1180°C can be adopted. Under normal circumstances, smelting aluminum bronze plates with phosphorus mostly use carbonaceous materials such as charcoal or petroleum coke to cover the solution, instead of using organic solvents. The covering agent commonly used in smelting aluminum bronze plates with zinc should also contain raw materials with carbon such as charcoal. During continuous forging, it is suitable to announce that the temperature should be controlled at 100-150°C above the high-efficiency liquidus of the aluminum alloy.
www.cn-czpufa.com