What is Ceramic Sand?
Fused Ceramic sand is a kind of spherical special sand with excellent performance for casting. After 20 years of promotion, it has been widely used in sand casting (wet mold sand, sodium silicate sand, resin self-hardening sand, hot core box, shell mold, cold core box, etc.), lost foam casting and other casting processes, as well as cast iron, cast steel, nonferrous alloy and other casting alloys, It has achieved remarkable economic benefits and good environmental protection effects, and is known as ‘the new green casting material in the 21st century’.
Over the past two decades, the production of Fused Ceramic sand has continued to grow, the production capacity has increased significantly, and the distribution of producing areas has become wider. Up to 2020, the total sales of Fused Ceramic sand will be nearly 200000 tons. At the same time, its production process, from bauxite roasting, arc melting, to iron removal and impurity removal, screening and mixing and other processes, has been continuously improved through technological innovation, realizing green environmental protection and sustainable development, and fully meeting the growing demand of the foundry industry.
The application scope of Fused Ceramic Sand is expanding from surface sand, filling sand, to hot box, shell mold, cold box core making, and then to the application of the overall self-hardening sand production line. According to the statistics for several consecutive years, its largest application is in the engine casting industry, accounting for about 1/3 of the total sales.
Introduction to Fused Ceramic sand and properties of Fused Ceramic sand
Fused Ceramic sand is a kind of casting sand with different particle size composition, which is made of Calcined Bauxite with aluminum oxide (Al2O3) as the main component, through arc melting, air injection, standard sieve screening and grading mixing. The particle size of Fused Ceramic sand for casting is generally between 0.053 ~ 3.53mm (270 ~ 6 mesh). The mineral phases of Fused Ceramic sand are mainly corundum and mullite, as well as a small amount of amorphous phase. The main chemical components of Fused Ceramic sand are aluminum oxide (Al203) and silicon dioxide (SiO2), and the fire resistance is ≥ 1800 ℃. It is a kind of nearly spherical, high strength and high hardness aluminum silicon casting sand.
Characteristics of Fused Ceramic sand
Fused Ceramic sand has low coefficient of thermal expansion, High thermal conductivity, nearly spherical, small angle factor, good fluidity and compactability. The surface shall be smooth without crack and concave convex; Neutral material, suitable for various casting alloys; The particles have high strength and are not easy to be broken; High fire resistance; The particle size range is wide, and the performance characteristics such as mixing can be customized according to the process requirements.