Turbulence or agitation of the melt and increased holding temperature significantly increase the rate of hydrogen solution, oxidation, and transient element loss. The mechanical properties of aluminum alloys depend on casting soundness, which is strongly influenced by hydrogen porosity and entrained nonmetallic inclusions. The aluminum foundry needs to degas and filter inclusions by Online Degassing Units and Filtering Units.
Aluminum and aluminum alloys can be melted in a variety of ways. Even under optimum melting and melt-holding conditions, molten aluminum is susceptible to three types of degradation:
- With time at temperature, adsorption of hydrogen results in increased dissolved hydrogen content up to an equilibrium value for the specific composition and temperature.
- With time at temperature, oxidation of the melt occurs; in alloys containing magnesium, oxidation losses and the formation of complex oxides may not be self-limiting.
- Transient elements characterized by low vapor pressure and high reactivity are reduced as a function of time at temperature; magnesium, sodium, calcium, and strontium, upon which mechanical properties directly or indirectly rely, are examples of elements that display transient characteristics.
Online Degassing Units for Molten Metal Treatment
AdTech online degassing units and CFF filter units can remove the hydrogen and nonmetallic inclusions.
Degassing Unit has an ultra-long life furnace body using new high-silicon molten material manufacturing technology. The degassing rotor, heater protection sleeve, and thermocouple protection sleeve are all made of silicon nitride (Si3N4) ceramic manufacturing technology. Degassing Unit is installed between the furnace and the casting machine. It is to exclude hydrogen and other residues contained in molten aluminum and its alloys that affect its quality and mechanical properties.
Cff Filter Box is used for high precision aluminum melt purification, which is used in conjunction with Degassing Unit. Its lining has an ultra-long life furnace body, and its material adopts a new high-silicon melting manufacturing technology. Built-in Ceramic Foam Filter to filter inclusions and tiny particles in aluminum liquid. Cff Filter Box replaces the expensive ceramic tube filter equipment and ordinary plate filter equipment products.