2023/11/18
Among natural corundum minerals, white fused alumina micron powder, brown fused alumina grain‑size abrasive, and black fused alumina abrasives rank just below diamond abrasives in hardness. These materials—white fused alumina micron powder, brown fused alumina grain‑size abrasive, and black fused alumina (Al₂O₃)—belong to the trigonal crystal system; their crystals exhibit a transition from ionic to covalent bonding and possess a relatively compact structure. Individual crystals typically occur as drum‑shaped or columnar forms, while aggregates appear granular or densely massive. The color is generally bluish‑gray or yellowish‑gray, with iron‑bearing varieties appearing black. They display a vitreous luster, have a Mohs hardness of 9, and lack cleavage. Twinning often gives rise to cleavage planes along {0001} or {101}. Their density ranges from 3.95 to 4.10 g/cm³, and they are chemically stable. When chromium‑containing specimens exhibit a red hue, they are referred to as rubies; those containing titanium and displaying a blue color are called sapphires.
2023/11/14
Where is silicon carbide mainly used?
Silicon carbide is produced by high‑temperature smelting in an electric resistance furnace, using raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips (with the addition of common salt when producing green silicon carbide).
2020/12/23
Applications of Black Corundum.07
Black corundum micron powder can be formulated into polishing waxes of various grades, used for the fine polishing of a wide range of workpieces.
2020/12/23
Applications of Black Corundum.06
Black corundum grit or micro‑powder can be used to manufacture fiber wheels, which are employed for grinding and polishing a wide range of workpieces.
2020/12/23
Applications of Black Corundum.05
Black corundum–aluminum oxide composites are used to manufacture abrasive cloth, which is then converted into abrasive belts, flap wheels, and other products for polishing various workpieces.
2020/12/23
Applications of Black Corundum.04
Using black corundum aggregate to pave wear‑resistant, slip‑proof surfaces—such as roadways, bridge decks, and parking lot pavements—and to manufacture wear‑resistant, slip‑proof flooring not only fully meets practical requirements but also offers exceptional cost‑effectiveness.
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