Vietnam Foundry ceramic foam filter includes a refractory aggregate mesh structure coated with a compound that can soften or stick at the temperature of molten aluminum alloy. With Foundry Ceramic Filters, the inclusion particles can be absorbed by the coating compound and removed from the molten aluminum.
Therefore, when aluminum scrap aluminum alloy products are used as part or all of the raw materials, at least the inclusions must be removed to obtain pure aluminum materials. In addition to the use of flux to refine the molten aluminum, it is also necessary to further use online degassing and Vietnam China Foundry Filter to filter the impurities in the molten aluminum.
According to the reactive gas method, inert gas or halogen gas is introduced into molten aluminum to generate bubbles. The inclusions adhere to the bubbles and float together in the molten aluminum to separate the inclusions from the molten aluminum. This method is particularly advantageous for removing gases such as hydrogen. However, the rising foam waved violently to melt the surface of the aluminum, so it stirred and melted. This will lead to another problem. The molten aluminum on the surface of the formed aluminum oxide film may reflow the aluminum to mix, resulting in an increase in the number of alumina inclusions.
The higher the viscosity of the impregnating material, the finer the mesh of the aggregated mesh member, and the more difficult the coating process. In particular, it is actually necessary to completely cover not only the outer surface of the mesh member, but also the inner surface of its openings (holes). Even if these surfaces are located in the center of the grid component, it is impossible to completely cover the entire grid component.
Aperture selection
Continuous casting and rolling: 40~60ppi
Gravity casting: 10~30ppi
Semi-continuous casting: 30~70ppi
High-quality aluminum or plate: 40~90ppi
Ceramic foam filters are basically divided into 6 pore sizes: 10PPI, 15PPI, 20PPI, 25PPI, 30PPI, and 40PPI. The larger the number, the smaller the aperture. But in actual practice, the four types of 10PPI 20PPI 30PP 40PPI can meet the needs of customers.
Ceramic foam filter aperture selection
1. The casting: 10～25ppi
2. Semi-continuous casting: 30～60ppi
3. High-quality aluminum or sheet: 50～60ppi
4. Continuous casting and rolling: 50～60p
Vietnam has a long and narrow terrain, high in the west and low in the east. Three-quarters of the territory is mountainous and plateau. The north and northwest are high mountains and plateaus. Fansipan, the main peak of Mount Huanglian, is 3142 meters above sea level, which is the highest peak in Vietnam; the west is the Changshan mountain range, which is more than 1,000 kilometers long. It runs from north to south and has a gentle west slope. It forms the Xiyuan Plateau in the provinces of Gia Lai-Kun Tum and Dak Lak. . The Middle Changshan Mountain Range runs from north to south, and there are some low mountain passes. The eastern coast is a plain with low and flat terrain, dense river networks, and an altitude of about 3 meters.
