The choice of Ceramic Filter for Non-ferrous Foundries depends on the type of casting alloy and pouring temperature. Cast iron is usually made of silicon carbide. Large cast steel and cast iron can be made of silica gel. Aluminum alloys are usually made of alumina and magnesium alloys are usually made of magnesium oxide.
The choice of Ceramic Filter for Non-ferrous Foundries is usually:
10 holes/inch (10 PPI Foam Filter) can be used for ductile iron large gray iron parts and steel castings.
20 holes/inch (20 PPI Foam Filter) is suitable for small gray cast iron, malleable iron, and non-ferrous metal castings.
30 holes/inch (30 PPI Foam Filter) is for copper alloy castings and aluminum alloy castings.
Alumina ceramic foam filter is suitable for aluminum alloy castings. The choice of ceramic foam filter is very important for a good filtration effect and no pollution to the alloy. Many practices show that the use of ceramic foam filters can remove inclusions, improve the structure of castings, improve the mechanical properties and qualified rate of castings, improve the processability of castings and reduce the processing cost. However, if it is not used properly, it will not only fail to achieve the expected effect, but also bring troubles to the production, and even increase the reject rate of castings.
The thickness of the alumina foam ceramic filter is selected based on the mechanism and purification method of foam ceramic filter. In order to give full play to the purification function and withstand the influence of high-temperature metal flow, the filter must have a certain thickness to prevent the filter from burning. Burning through the filter will cause slag and scrap the casting.
When using an alumina ceramic foam filter, the pore size of the filter should be determined according to the quality requirements of the castings and the number of inclusions in the molten metal. The size of the filter should be determined according to pouring speed and pouring weight. In order to ensure the filtering effect of the filter, the placement of the filter and the design of the door control system should also follow the specifications.
