Aluminum alloy airtight joint casting processing is a relatively inexpensive billet forming method, which is more economical for parts with complex shapes, such as cylinder blocks and car engine heads, ship propellers and artwork, and some difficult-to-cut parts such as Nickel-based alloys used in gas turbines cannot be formed without melting.

　　The size and weight of aluminum alloy airtight joint casting processing are very wide, and the types of aluminum alloys are almost unlimited. These parts have general mechanical properties and have overall properties such as wear resistance, corrosion resistance, and other aluminum alloy forming methods. Such as forging and welding, etc., can not be completed, so the number of billets produced by casting methods in the machinery manufacturing industry is still large in terms of quantity and tonnage.

　　The positive effects of coatings on the casting and production process of aluminum alloy airtight joint casting processing:

　　In general, most of the coatings used in the casting process of aluminum alloy airtight joint casting processing are graphite powder. Because graphite powder has improved peeling properties, carbon monoxide gas molds and bright carbon will be produced in the links of casting, solidification, and cooling. The film can not only effectively prevent the interaction between the molten metal and the core surface, but also prevent it from sticking to the sand.