The ceramic foam filtration method can not only filter out the fine inclusion particles of 10μm-20μm in the alloy melt, but also filter out the flux that cannot be filtered by the general filter media.
Melt purification processes can be divided into two categories: flux purification and non-flux purification. Due to the high efficiency of removing impurities, low cost and convenient operation, the flux purification process has become a common purification process in the production of magnesium alloys.
However, flux purification also shows disadvantages, such as increased metal loss, flux inclusions, inability to degas, etc. In particular, when smelting and refining rare earth magnesium alloys, the flux will also consume a large amount of rare earth elements in the alloy.
The non-flux purification process can not only make up for the deficiency of the flux purification process, but also has an excellent purification effect, so it is an important melt purification process that is being used and developed.
Various non-flux purification technologies have been developed, such as filtration purification, spinning spray purification, electromagnetic purification and ultrasonic treatment. Compared with simple metal mesh melt filtration, the ceramic foam filter containing a specific 3-D porous ceramic structure has a good filtering effect on the filter cake, adsorption effect and rectification effect due to its high porosity. The inclusion particles in the melt have a good filtering effect (70%-90%), strong adsorption, chemical resistance, etc.
Ceramic foam filters play a vital role in the metal casting and foundry industries, where they are used to filter out impurities in molten metal to improve the quality and performance of the end product.
Even the slightest non-metal impurities in molten metal can have a devastating effect on the performance and strength of finished metal goods. This can result in end products failing to meet the necessary quality standards. The ceramic foam filtration method plays an essential role in removing these impurities and ensuring high-quality casting.