The effect of adding silicon in aluminum alloy die casting
There is a saying that adding silicon to an aluminum alloy increases the fluidity of the alloy. This argument is incomplete, biased and misleading. The following small series to take you to understand the main role of aluminum alloy die casting silicon!
There is a saying that adding silicon to aluminum alloy can increase the fluidity of the alloy. This argument is not comprehensive, and it is biased and misleading. Here's a little tape to let you know the main role of adding silicon inaluminum alloy die casting!
1. Adding silicon can increase the fluidity. This function is mainly aimed at bottom filling under extremely low pressure such as gravity casting. In fact, it is more than 1 MPa There is not much difference between the alloy filled with silicon and the alloy not filled with silicon. In today's die casting process, the filling pressure can exceed 100MPa, and the alloy with poor fluidity has no difficulty in insufficient filling p>
2. It can reduce the volume shrinkage of "liquid-solid" phase transition. According to many experiments, aluminum alloys with silicon content of about 20% can almost achieve the same transformation volume. Therefore, if the aluminum piston is used for high temperature applications, it will generally be an alloy with high silicon content. Due to the essential characteristics of the die-casting process, it is a unidirectional high-pressure high-strength filling casting without reverse feeding function, which is completely different from the low-pressure casting and gravity casting in reverse feeding and filling process characteristics. For this reason, the industry has specially formulated a relatively low phase transformation shrinkage and a silicon content as high as possible, specifically for aluminum alloy grades that cannot be reverse fed in the die casting process p>
Adding silicon to the alloy has its disadvantages, as well. The price of this is that the strength of the alloy is greatly reduced, and the alloy is more brittle, and its elongation is also significantly reduced p>
Huizhou Shuangcheng Hardware Die Casting Products Co., Ltd. has products such as hardware die casting, die casting structures, die casting molds, zinc alloy die casting, die casting parts, aluminum alloy die casting, etc. The company takes quality as the starting point for enterprise survival, follows the ISO quality system, constantly innovates, improves management ability, meets the needs of market competition, and constantly innovates and expands its ambitions under new challenges and opportunities p>