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Calcination is a kind of abrasive processing method, of applied to Brown Fused Alumina. These may be either 1050℃ as medium temperature heat treated or 1350℃ temperature heat treated, both enhance toughness, 1350 heat more so than 1050 heat.
1050 Calcined Brown Fused Alumina is used to improve cleanliness and capillarity. It also reduces the reverse expansion, impurities and micro-cracks caused by crushing of abrasive particles, and the grain has the characteristics of high purity, stable chemical properties and high temperature resistance. As a result, it brings an extremely stable sintering process and makes the vitrified wheels without any defect of microcracks and small holes in surface and inside.
1350 Calcined Brown Fused Alumina imparts a bluish color to the grain, that is the reason suppliers like the name of “Blue Fired”. After calcination, the impurities existing in the abrasive are precipitated or vaporized, which makes the brown fused alumina purer with maximum toughness and durability.
However, the flowability of calcined abrasive is not that good, the moisture-proof ability becomes worse, needs some additives to improve it.
Uses of calcined abrasive include bonded abrasives, coated abrasives, and specialized industrial applications.
