The ceramic porous filter is used as a filter material for molten metal, and high mechanical strength metal plates or foils require a few pinholes.
Recently, in consideration of energy-saving and weight reduction, materials for parts such as engines requiring high mechanical strength have been converted from iron steel to aluminum. In addition, the demand for aluminum foils or sheets with a thickness of several micrometers to hundreds of micrometers as packaging materials for food and beverages, and thin metal wires for electrical conductors such as copper wires have greatly increased. The diameter ranges from a few microns to tens of microns. However, these metal products are strongly required to have high quality. Therefore, if there are solid impurities and molten impurities, such as hydrogen, sodium, etc., in the cast products used to manufacture metal products, these impurities must be completely removed from the molten metal because they will greatly reduce the quality of the metal.
Since metal casting products are usually produced by filtering molten metal, a two-step method has been practiced to remove such impurities from molten metal. The method includes the first step of passing the molten metal through an alumina manufactured bed filter. A ball or alumina sintered body with a diameter of a few millimeters to remove solid impurities therefrom. The second step is to remove unfiltered inclusions, such as molten impurities such as hydrogen and sodium, by chemical or physical adsorption methods.
However, the operation of such a two-step method is very troublesome and has the disadvantage of not being able to effectively remove impurities. In addition, the bed filter using alumina balls is suitable for removing coarse solid impurities, but not for removing ultrafine solid impurities. On the other hand, the use of an alumina sintered body can remove fine solid impurities, but due to the large pressure loss, the filtration time is long, resulting in low productivity. In any case, it is difficult to reliably and effectively remove ultrafine solid impurities and molten impurities from molten metal by conventional methods.
In order to solve the above-mentioned shortcomings of the prior art, AdTech also provides a ceramic porous filter with very advantageous performance as a molten metal filter material. The ceramic porous body can remove solid impurities and molten impurities in the molten metal in one step, so as to ensure Effectively remove these impurities from molten metal.