Ceramic sand, also known as Baozhu sand, is a new type of green high-end casting sand, it is based on aluminum oxide (Al2O3) as the main component of calcined bauxite, by melting, blowing, screening, mixing into different granularity of spherical artificial casting sand. Ceramic sand has the characteristics of high refractoriness (> 1790ºC), small angular coefficient (≤1.1, approximately spherical), low acid consumption value (neutral material), small amount of binder added (reduce the amount of binder added 30%-50%), high strength, no crushing, no dust, non-toxic, etc. Suitable for resin self-hardening sand (furan resin, alkaline phenolic resin, Bonny resin, etc.), cold core box method, coated sand and shell casting, water glass sand (organic fat, CO2 hardening, modified water glass), lost mold and V method casting (filled sand), coating (ceramic sand powder), 3D printing and other casting processes. It is widely used in automotive engines and auto parts, large cast steel (manganese steel, carbon steel, alloy steel, high chromium cast iron), cast iron and non-ferrous metals (copper alloy, aluminum alloy) and other fields, and is praised by experts as a new green casting material in the 21st century.
Chemical compositionAl2O3≥70%, Fe2O3≤3%, SiO2≤24%, other: trace.
Physical property
1. Grain shape: spherical
2. Angular coefficient: <1.1
3. Packing density: 1.9-2.1g/cm3
4.P H value: 7-8
5. Thermal conductivity: 0.5-0.6(W/m*K)(1000ºC)
6. Thermal expansion rate: 0.13%(1000ºC heating for 10 minutes)
7. Fire resistance: >1790ºC
8. Acid consumption value: ≤3.0ml
Peculiarity
1. Small thermal expansion coefficient, comparable to zircon sand, ceramic sand preparation, core sand, can basically eliminate casting veins and other expansion defects, improve dimensional accuracy.
2. Ceramic sand is nearly spherical, good fluidity, easy to fill, sand mold and sand core have high permeability, good collapsibility after pouring.
3. The surface of ceramic sand is smooth and the structure is dense, which is easy to cover the binder evenly and can save 30-50% of the binder.
4. Ceramic sand is a neutral material, acid and alkali binders can be used, and adapt to various casting alloys.
5. Ceramic sand recycling performance is good, cost-effective, can be adapted to various regeneration methods.
6. Ceramic sand has high refractoriness and good stability, which is especially suitable for the production of complex sand cores and steel castings.
7. Wide range of ceramic sand particle size, can be arbitrarily combined and mixed according to requirements to meet the different needs of customers.
