Ceramic Foundry Sand, technically named as “Fused Ceramic Sand for Foundry”, also named as ceramsite, is good spherical grain shape which is made from calcined bauxite. Its main content is aluminum oxide, and it is processed by melting, blowing, sieving and blending. Ceramic sand, has much better properties than that of silica sand to gain a better performance in foundry. It has high refractoriness, stable inert characteristics, excellent flowability, intrinsic hardness and wear resistance.
From above table, Ceramic Foundry Sand has the following characteristics:
The thermal expansion coefficient of ceramic sand is very low, which is similar to zircon sand. Using the Ceramic Foundry Sand to make moulds and cores, the veins and other expansion defects of castings are eliminated
Because of the great spherical shape of the particle, Ceramic Foundry Sand has good flowability and easy to fill in. The moulds and cores are of high permeability and easy to shakeout after casting
By using Ceramic Foundry Sand, 30-50% of the binder consumption can be saved with the smooth surface and substantial structure
Ceramic Foundry sand is a neutral and inert material, so it can be used in acid and alkali binders systems, also adapt to various alloys
Ceramic Foundry Sand has high refractoriness and good stability. It is especially suitable for the production of complexity sand cores and steel castings
It has wide particle size, which can be combined and mixed arbitrarily to meet specific needs of customers
Because of the high value of Moh’s Harness and spherical shape, Ceramic Foundry Sand has good recycling performance and low crushing ratio, so it can be easily reclaimed by many methods
Meanwhile, there are two different types of Ceramic Foundry Sand, one is regular Ceramic Foundry Sand with dark brown color, the other one called Kailin Golden Sand with golden and light yellow color. The main chemical and physical properties are the same with each other, but Kailin Golden Sand has been calcined twice, which results in the phase transformation from corundum to mullite, so the color has been changed.
The Micrograph of Ceramic Foundry Sand & Kailin Golden Sand
Form the above three figures, the result can be because of the great spherical shape of the particle, Ceramic Foundry Sand has good flowability and easy to fill in. The moulds and cores are of high permeability and easy to shakeout after casting
Parts of Particle size Distribution
From the above table, Ceramic Foundry Sand has wide particle size, which can be combined and mixed arbitrarily to meet specific needs of customers