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2022
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04
Differences in Characteristics between Single Crystal Corundum and Microcrystalline Corundum
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【概要描述】Single crystal corundum: Single crystal corundum is made by co melting bauxite, anthracite, iron filings, and pyrite in an electric arc furnace. Iron oxide, silicon dioxide, and titanium oxide in alumina are successively reduced to form ferroalloys, which deposit from the melt to the bottom of the furnace. A small portion of aluminum oxide reacts with carbon and ferrous sulfide to generate a small amount of aluminum sulfide filled between the single crystal particles. When the frit is cooled and placed in water, the aluminum sulfide dissolves, and the single crystal corundum separated by the aluminum sulfide can be dispersed into natural abrasive particles.
Characteristics of Single Crystal Corundum
Single crystal corundum: Single crystal corundum is made by co melting bauxite, anthracite, iron filings, and pyrite in an electric arc furnace. Iron oxide, silicon dioxide, and titanium oxide in alumina are successively reduced to form ferroalloys, which deposit from the melt to the bottom of the furnace. A small portion of aluminum oxide reacts with carbon and ferrous sulfide to generate a small amount of aluminum sulfide filled between the single crystal particles. When the frit is cooled and placed in water, the aluminum sulfide dissolves, and the single crystal corundum separated by the aluminum sulfide can be dispersed into natural abrasive particles.
Performance: Single crystal corundum is gray white, and its particle shape is mostly the same as the product shape. The crystal contains no impurities and has a multi angle cutting edge. Under the same grinding force, the torque generated is smaller than that of other abrasives, making it less prone to fracture and having higher mechanical strength. The compressive strength of a single particle is 22-38 kilograms, but only 10-20 kilograms. Single crystal corundum has high hardness and toughness, therefore it has strong cutting ability. It can be used to process difficult to grind materials with high toughness and hardness, such as tool steel, alloy steel, stainless steel, and high barium steel.
Various physical and chemical indicators of single crystal corundum:
Chemical composition: Al2O3 99% -99.72% (GB10174-88 standard)
Particle size composition: 24 # -240 # (GB2477-83 standard)
Compressive strength: 30.7N Molding method: 69.25% -82.57%
Toughness: 64.9% Particle density: 3.96-3.99 g/cm2
Magnetic material: 94.6%
Characteristics of microcrystalline corundum
Microcrystalline corundum: Microcrystalline corundum is obtained from bauxite as the main raw material through high-temperature melting and rapid cooling crystallization. The color and chemical composition are similar to brown corundum. Small crystal size, high toughness, and good self sharpening. The grinding tools made from it are suitable for heavy-duty grinding, forming grinding, cut in grinding, and rough grinding. It is also suitable for grinding stainless steel, carbon steel, bearing steel, and special ductile iron.
Performance: During the smelting process of microcrystalline corundum, the degree of impurity reduction is poor, the Al2O3 content is 94-96, the body size is generally 80-300 microns, and the crystal accounts for 57-85 large crystal sizes, not exceeding 400-600 microns. It has the characteristics of high strength and high toughness. Suitable for heavy-duty grinding, it can grind materials such as stainless steel, carbon steel, bearing steel, and special ductile iron. Due to the fact that the abrasive particles are in a state of micro blade breakage during the grinding process, they can also be used for precision grinding or even mirror grinding.
Chemical composition: Al2O3 94% -96%
Crystal shape: α- Al2O3 cubic crystal
Density:>3.90
Hardness: Mohs 9.0
Melting point: 2000 ℃
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