Aluminium silicon alloys AlSi20 AlSi30 AlSi50

Alumnium silicon alloys AlSi20 AlSi30 AlSi50

Application

Silicon exists in aluminum as a naturally occurring trace residua as well as a deliberate alloying addition. As an additive, it is used to improve cast ability of the foundry products and to influence the mechanical properties of finished products. At concentrations above 12%, silicon can significantly improve wear resistance.

Since silicon melts at 1430℃ and require substantially more energy than aluminum to melt, its dissolution in aluminum baths requires special care. The rate of silicon dissolution is controlled by the temperature, the bath composition, and the solid silicon and the molten aluminum.
When adding silicon to a bath, the use of 50% silicon aluminum rather than silicon metal (with or without flux coating) offers certain advantages:

1. More interfacial area
2. Fewer SiO2, SiC and silicon metal dross inclusions.
3. Faster overall solution rate.
4. Predictable and complete silicon recoveries.
5. No refractory damage due to salt fluxes.

Composites: