Ceramic foundry sand, whose scientific name is fused ceramic sand, is a spherical artificial casting sand with high heat resistance, low thermal expansion, which is obtained by spray treatment of molten high alumina raw material (bauxite) and recrystallization through calcination, electro -fusion, granulation, screening processes.
Compared with traditional materials, ceramic foundry sand has outstanding advantages:
First, the coefficient of thermal expansion is small, and the casting will not produce expansion defects when it is used to prepare molding sand; Second, the sand particles are spherical, with good fluidity, easy compaction and good air permeability; Third, the surface is smooth and the structure is dense, so that the binder can be evenly covered; Fourth, Ceramic foundry sand is a neutral material, acid and alkali binders can be used; Fifth, it has high fire resistance and is easy to collapse, which is conducive to casting modeling; Sixth, high thermal conductivity, good stability and no cracking; Seventh, the recycling rate is high, which can reach more than 98%, reducing the production cost, and greatly reducing the emissions of solid waste and waste gas from foundry enterprises. It can effectively reduce and avoid the risk of silicosis among industrial workers while improving the production environment of foundry enterprises.
The excellent performance of Ceramic foundry sand provides a practical solution for energy conservation and emission reduction in the foundry industry. It is the choice of molding materials for foundry enterprises, and has gradually become a substitute for quartz sand (silica sand). At present, it is applied to carbon steel, alloy steel (high manganese steel, high chromium cast iron), cast iron, cast copper and other metal castings, and can be applied to V-process, VRH, lost foam, investment molding, general sand mold resin bonded sand, coated sand and other processes have unlimited development space in the casting field.
Ceramic Foundry Sand Advantages
1. Ceramic foundry sand has a small coefficient of thermal expansion, which is comparable to zircon sand. Using it to prepare mold and core sand, castings can basically eliminate expansion defects, such as veins and other defects.
2. Ceramic foundry sand is nearly spherical, with good fluidity, easy filling, good permeability and collapsibility.
3. The surface of Ceramic foundry sand is smooth and the structure is dense, so that the binder can be evenly covered, and the addition amount is reduced by 30%-50%.
4. Ceramic foundry sand is a neutral material, which can be used as acid and alkali binders, and is suitable for all kinds of casting alloys.
5. Ceramic foundry sand is suitable for various regeneration methods, with good recycling performance and high cost performance
6. Ceramic foundry sand has high fire resistance and good stability, especially suitable for the production of steel castings.
7. Ceramic foundry sand has a wide range of particle sizes, and can be mixed in any combination according to customer requirements.