Filter Zirconia

09 6月 Filter Zirconia

Filter Zirconia is used for aluminum alloy melt filtration and purification

Inclusions and gases in the metal have a significant impact on the material’s strength, fatigue resistance, corrosion resistance, stress corrosion cracking performance, etc.
Effectively controlling the oxidized inclusions in the melt to improve the quality of cast rods and rolled plates has become a common goal pursued by metallurgy, foundry and materials industry in various countries.
Filter Zirconia is currently widely used to remove inclusions in aluminum alloy melts.

Formation of inclusions in aluminum alloys
Some of the inclusions in the aluminum alloy come directly from the charge, while most of them are formed during the melting and pouring process, mainly oxide inclusions.
All the inclusions before casting are called primary oxidation inclusions. Filter Zirconia can be used to remove the oxidation inclusions

Dispersed inclusions, such inclusions cannot be completely removed after refining. It increases the viscosity of the metal melt and reduces the ability of the aluminum to shrink during solidification.
The secondary oxidation inclusions are mainly formed during the casting process. During casting, the aluminum liquid and air contact, and oxygen and aluminum act to form oxidized inclusions.
The aluminum alloy contacts various components in the furnace gas during the smelting process to form compounds such as AL2O3.
Al2O3 in the aluminum liquid will increase the hydrogen content of the aluminum residual melt.

Filter purification method
Ceramic Filter For Foundry technology came out in the 1970s and has been widely used in the United States, Canada, Japan, France, Australia, and Switzerland.
It is the most effective method to remove the inclusions in the aluminum melt before using the foam ceramic filter plate filter port.

In recent years, some new technologies for purifying aluminum liquid at home and abroad have also been studied, such as vacuum dynamic processing, ultrasonic continuous degassing purification and Filter Zirconia, which have received very good results.
As for the metal filter and fiber cloth filtration, only large inclusions in the aluminum alloy melt can be removed, but the inclusions below the micron level cannot be removed, and the metal filter will also contaminate the aluminum alloy.
Using Zirconia Cff can filter out small inclusions and significantly improve the mechanical properties and appearance quality of castings.

Filtration principle
The foam ceramic filter plate has a multi-layer network and multi-dimensional through holes, and the holes communicate with each other. When filtering, the aluminum liquid carries the inclusions along the tortuous channels and pores, and is directly intercepted, adsorbed, and deposited when it contacts the foamed skeleton of the filter plate. When the melt flows in the hole, the filter plate channel is curved, and the melt flowing through the channel changes the flow direction, and the inclusions collide with the hole wall anvil and firmly adhere to the hole wall.

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