What are the uses of Si-Al alloy?
Silicon-aluminum alloy is an alloy material, which is composed of silicon and aluminum respectively. In industry, silicon-aluminum alloy can be divided into three categories: one is hypoeutectic silicon-aluminum alloy with silicon content of 9% ~ 12%; The second type is eutectic silicon-aluminum alloy with silicon content of11%~13%; The third type is hypereutectic silicon-aluminum alloy, the silicon content is above 12%, mainly in the range of 15% ~ 30%; Silicon-aluminum alloy materials can maintain the excellent properties of silicon and aluminum, and have no pollution to the environment and are harmless to human body. It is mainly used in aerospace, electronic devices and space technology. If the total silicon content of silicon-aluminum alloy is high, its wear resistance, crack resistance and fluidity can be improved, and its thermal expansion coefficient can be reduced.
Method for manufacturing silicon-aluminum alloy
1, casting method
Because of its low cost, melt casting method can be mass-produced with simple equipment and is the most commonly used preparation method. However, this method is easy to produce cracks in the machining process, the material composition segregation is serious, the mechanical properties are poor, and it is difficult to carry out subsequent machining. With the increase of silicon content in the alloy, it is difficult to prepare high silicon aluminum alloy materials by conventional casting. 2 infiltration method
There are two infiltration methods, one is pressure infiltration, and the other is pressureless infiltration. Pressure infiltration can solve the problem of incomplete infiltration caused by increasing the wettability of materials and molten metal. Because it is mechanical pressure molding, it will be more complicated, so its application and development are limited now.
3. Powder metallurgy
Powder metallurgy is made of aluminum powder, silicon powder and binder by dry pressing. This method can solve the problem of poor wettability between silicon particles and aluminum matrix, and can be molded at one time, which overcomes the shortcoming of difficult processing of metal matrix composites. However, the process is complex, difficult to control accurately, and the molding is not compact and costly.
Bian Xiao concluded: What are the related contents of the use of silicon-aluminum alloy? I hope it will help everyone.