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White corundum
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Definition: An artificial abrasive. The content of aluminum trioxide (Al2O3) is above 98%, and it contains a small amount of iron oxide, silicon oxide and other components, showing white color.
The product granularity is produced according to international standards and national standards, and can be processed according to the granularity required by users. Generally, the particle size number is F4~F220, and its chemical composition varies according to the particle size. The outstanding features are small crystal volume and impact resistance. If crushed by a self-grinding machine, the particles are mostly spherical, the surface is dry and clean, and it is easy to combine with the binder.
Chinese name: white corundum
Mbth: white fused alumina
Application: mechanical engineering, abrasives, abrasives
Model: Duan sand, 1 sand, f sand and WA sand.
Material: alumina powder
Content: 98.5%
Hardness: Mohs hardness 9.0
True density: > 3.95g/cm3.
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Product introduction
White corundum is made of industrial alumina powder, which is melted in an electric arc at a high temperature of more than 2000 degrees and then cooled. After crushing and shaping, magnetic separation to remove iron and screening, the texture is dense, the hardness is high, and the particles form sharp corners. Suitable for manufacturing ceramics, resin bonded abrasives, grinding, polishing, sand blasting, precision casting (corundum for precision casting) and so on. It can also be used to make high-grade refractories, code-named "tile".
White corundum particle size difference picture
6 albums
White corundum density
There are two kinds of density, one is volume density and the other is true density.
Laminated density
1.53~ 1.99g/cm3, the packing density of abrasives is related to abrasive particle size, particle composition, particle shape and other factors. Generally speaking, the bulk density of coarse abrasive is higher than that of fine abrasive, and that of mixed abrasive is higher than that of single abrasive.
Real density
3.95~4.0g/cm3, the true density of abrasive refers to the quality of abrasive contained in unit volume (excluding the volume with pores).
Basic particle size
45%~55%, the basic particle size is an important index to ensure the grinding effect, which should be properly controlled during production, but the production speed may slow down.
Product advantages:
1, which does not affect the color of the workpiece;
2. It can be used for sand blasting in the process where iron powder residue is strictly prohibited;
3. The micropowder grade is very suitable for wet sand blasting and polishing operations;
4. Fast processing speed and high quality;
5. The iron oxide content is extremely low, which is suitable for prohibiting iron slag sandblasting;
6. Impurities are removed by pickling.
tangible property
transparent
Triangular system
Real density
3.90 g/cm3
Bulk density
3.60 g/cm3
difficulty
Knoop hardness
2000-2200 kg/mm2
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Physical and chemical indicators
use
standard
Main chemical composition%
aluminium oxide
Na2O
Magnetic substance%
silicon dioxide
worn-out
sharpener
F 12#—80#
≥99.4
≤0.4
—
≤0.03
90#— 150#
≥99.3
≤0.4
≤0.03
≤0.05
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White corundum abrasive-product use
Scope of application: White corundum abrasive is suitable for beautifying the surface of various high-grade products, crafts or hardware products. After sandblasting, the surface is white and free of any impurities, eliminating the trouble of cleaning. Fine white corundum can be used as a polishing head. And can also be use as an additive for various products. It can be used as solid and coated abrasive, wet or dry or sandblasting, and is suitable for ultra-precision grinding and polishing in crystal and electronic industries and making advanced refractories. Suitable for processing hardened steel, alloy steel, high-speed steel, high-carbon steel and other materials with high hardness and high tensile strength. It can also be used as contact medium, insulator and sand for precision casting. Derusting, decontamination and descaling of iron workpieces to increase the adhesion between coating and coating; Rust removal of aluminum workpiece, surface strengthening and polishing; Matte effect of rust-removing copper workpieces, matte effect of crystal glass products, matte effect of patterned plastic products, plush processing and effect patterns of special fabrics such as denim.
1, surface treatment: metal oxide layer, carbide black skin, metal or nonmetal surface rust removal, such as gravity die casting mold, rubber mold oxide or release agent removal, ceramic surface black spots, uranium color removal, paint regeneration.
2. Beautifying processing: matte processing of all kinds of gold, K-gold ornaments and precious metal products, matte processing of non-metals such as crystal, glass, ripple and acrylic, and the surface of the processed products has metallic luster.
3. Etching: an artist who etches jade, crystal, agate, semi-precious stones, seals, yashi, antiques, marble tombstones, ceramics, wood and bamboo chips.
4. Pretreatment: Teflon, PU, rubber, plastic coating, cots, electroplating, metal spray welding, titanium plating, etc. , to increase the surface adhesion.
Burr processing: bakelite, plastic, zinc, aluminum die casting, electronic parts, magnetic cores, etc.
6. Stress relief: stress relief, rust removal, paint removal, extinction and renovation of parts in aerospace, national defense and precision industries.
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