Fused white corundum

It is made by melting in an electric arc at a high temperature of over 2000 degrees and then cooling. After crushing and shaping, resin-bonded abrasive tools, grinding, polishing, sandblasting, precision casting (special corundum for precision casting), etc., it can also be used to manufacture advanced refractory materials, code name "WA" is consistent with international standards and national standards. Most of them are for export, and a certain amount is also supplied to domestic users.

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White corundum abrasive is made of alumina as raw material and smelted at high temperature. It is white, slightly harder than brown corundum, and slightly lower in toughness. Abrasive tools made of white corundum are suitable for grinding high carbon steel, high speed steel and quenched steel. White corundum abrasives and sub-white corundum abrasives can be used as grinding and polishing materials, precision casting sand, spray materials, chemical catalyst carriers, special ceramics, advanced refractory materials, etc. It is made from industrial alumina powder as raw material, which is smelted in an electric arc at a high temperature of over 2000 degrees and then cooled. It is crushed and shaped, magnetically separated to remove iron, and screened into a variety of particle sizes. Its texture is dense and hard, and the particles form sharp angles. It is suitable for manufacturing ceramics, resin-bonded abrasives, grinding, polishing, sandblasting, precision casting (special corundum for precision casting), etc. It can also be used to manufacture advanced refractory materials. The code name "WA" is consistent with international standards and national standards. Most For export, there is also a certain amount of supply to domestic users. It is produced according to international standards and national standards, and can be processed according to the particle size required by users. The general particle size numbers are F4~F320, and its chemical composition varies depending on the particle size. The outstanding feature is that the crystal size is small and impact-resistant. If it is processed and broken by an autogenous grinder, the particles will be mostly spherical particles with a clean surface and easy to combine with the binder. There are two types of density, one is the packing density of white corundum, and the other is the true density of white corundum. The packing density is: 1.53~1.99g/cm3. The packing density of abrasives is related to the particle size, particle size composition, variety, particle shape and other factors of the abrasives. Generally speaking, coarse-grained abrasives have a higher packing density than fine-grained abrasives, and mixed-grained abrasives The packing density is greater than the single particle size density. The particle density is: 3.95~4.0g/cm3. In recent years, the true density of Zhengzhou Dayu Company’s special corundum for precision casting has reached 4.1/cm3. The true density of the abrasive refers to the mass of the abrasive contained in the unit volume (excluding the volume of open pores) Crystal form: Trigonal crystal system Chemical properties: Amphiphilic Reacts with acid: slightly corroded in aqua regia and hydrofluoric acid Reacts with alkali: only slightly reacts with strong alkali hot solution Redox effect: No Density: 3.90 g/cm3 Hardness: Knupp hardness 2000-2200 Kg/mm2, Mohs hardness 9.0 color: White Melting point: 2250 C Maximum operating temperature: 1900 C Specific heat: (Cal/g. C) 0.26 (20 - 90 C) Thermal conductivity coefficient Room temperature 900 C (Cal/cm3. sec. C) Refractive index: e=1.760 w=1.768 (Na line) Resistivity: 30 C 300 C 900 C 1600 C (cm) 10 16 10 13 10 5 10 4 Linear expansion coefficient: 7 - 9 (0 - 1600 C)