The quality of Al-Si casting product is important for its applications, however the molten aluminum has high solubility of H2 at melting temperature in the casting process, so the formation of gas porosity during aluminum solidification is inevitable. This can cause a major drawback to the mechanical properties. The most common method to remove hydrogen gases in the molten metal is degassing. In this experiment, a conventional degassing method using Sodium Nitrate-Sodium Fluoride based degasser is conducted. Al-Si12 was melted at 720 °C then the degasser was plunged into the furnace bottom and held for three minutes. The results show better mechanical properties by the addition of degasser. This is because the degasser binds H2 gases which is formed in the melting process. The mechanical properties between casting products that use NaF-NaNO3 degasser and NaF-NaNO3 with addition of NH4Cl or KCl were measured and compared. The lowest mechanical properties were obtained when using degasser without NH4Cl or KCl. This is because NH4Cl or KCl is reactive and helps with the efficiency of degasser.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 4 Oct 2019|
|Event||3rd International Conference on Advanced Material for Better Future 2018, ICAMBF 2018 - Surakarta, Central Java, Indonesia|
Duration: 15 Oct 2018 → 16 Oct 2018