Kinds of Fused Alumina

Fused alumina is a granular material utilized in abrasives and refractories manufacturing due to its traits such as low permeability, low porosity, higher density & refractoriness. We get fused Alumina when Alumina is melted in electric arc furnaces by transmitting present between carbon electrodes.

Electric arc furnaces produce fused alumina in numerous forms, the most common are white (WFA) & brown (BFA) pink and black are the other forms available. Fused alumina melts approximately at 2,500??C and has a Mohs hardness of 9.￡¨Green Chromium Oxide￡?

Blue Fused Alumina

Blue Fused Aluminamakes up about two-thirds of the output, and perhaps one of the widely utilized abrasives. The electric arc furnace when charged with bauxite and additives we get increased BFA. It is produced use of in a wide number of applications chiefly in bonded abrasives, predominantly grinding wheels for high tensile materials, & coated abrasives like discs, belts, and paper for wood and metalworking.

China is the world's largest producer sharing more than 50% of BFA production.BFA Grains when calcined before use improve hardness, set ceramic coatings that enhance the surface roughness and raise the bond from the bonding media with the grain.

White Fused Alumina

White Fused Alumina consequently used in refractories are the purest & highest one in grade. WFA formed as a result of Bayer process alumina is a friable product. As BFA, WFA is also utilized for manufacturing coated products, grinding wheels (both resin bonded and vitrified). These grains are used also in shot blasting and polishing media; WFA of refractory grade is used as raw material for high alumina refractories

Pink & Red Fused Alumina

Addition of chromium oxide to WFA produces Pink and red fused aluminas, result increase in the toughness of the finished product.

Pink fused alumina has about 2% chromium oxide and features a Knoop hardness of 2,150 when evaluated with that of WFA, which is of 1,950. To be able to improve toughness little quantity of titanium oxide is also added to it.

Medium dimension sharp or blocky grains of Pink fused alumina make it apt for precision tool space grinding of hard alloy steels and broad surface.

Red fused alumina has Chrome Oxide content of about 3% with small amount of calcium oxide ferrous oxide, sodium oxide, silicon oxide, and magnesium oxide. This fused alumina is tougher than pink grades. They too have friable grains, blocky and sharp edged.( Chrome Oxide Green, Chromium Oxide Green, Chrome Oxide Green Refractory)