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Cheap Aluminium Oxide Blasting Manufacturers South Korea

The brown fused alumina calcined color is a reproducible quality mark for consumers and manufacturers of brown corundum. After the brown corundum is calcined in an oxidizing atmosphere, the brown particles of the brown corundum become blue, and the solid solution of Ti2O3 causes the blue color to appear. Ti2O3 is the only oxide that titanium can dissolve in α-alumina grains.

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At the same time, TiO2 is the oxide with the best thermodynamic stability of brown aluminum oxide. Above 1000 ° C, oxygen can diffuse into α-alumina grains and oxidize Ti2O3 to more stable TiO2. Rhenium is then encapsulated in alpha-alumina grains. The core of TiO2 continues to coalesce and grows at a temperature-dependent rate. Once the aluminium oxide sandblasting grains reach 0.01 to 0.1 μ in size, they begin to scatter light similar to colloidal suspensions.

This selective scattering of blue light at a shorter wavelength makes the α-alumina grains blue. The selective scattering of light by such small brown aluminium oxide particles is called the "Tyndall effect". If the nucleus of T iO2 is allowed to grow to about 0.1 μm, they will no longer only scatter blue light, but will treat all wavelengths of the scattered light, and the heat-treated black aluminum oxide abrasive 70 grit will become light gray. Only brown corundum containing solid solution titanium oxide (Ti2O3) will appear in blue.

Like many characteristics of granular garnet abrasive materials, the blueness after calcination is the average color of all particles in the sample. In a calcined brown corundum sample, the proportion of blue particles is high to medium range of typical titanium dioxide (TiO2) content technical conditions of 2.4% to 3.0%, while non-blue particles are lower than technical conditions. The sintered corundum chemical hardening treatment method is also repeated impregnation with black alumina phosphate or chromic acid.

Lower limit. There may be some kind of white fused aluminum oxide whose chemical composition is within the range of typical technical conditions, but it will not turn blue after calcination, because it is mostly a mixture of low titanium dioxide particles, doped with some high titanium dioxide particles. The purpose of surface coating treatment is to enhance the binding ability of the abrasive to the bonding agent and improve the strength of the corundum white abrasive products.

Surface coating is to apply a layer of metal oxide, such as Fe2O3, TiO2, Zr2O3, etc. on the surface of the black aluminum oxide blast media abrasive particles with a thermosetting resin. Abrasive cloth made by coating can be doubled in grinding amount and 1.5 times in grinding ratio. The new chemical hardening process has caused revolutionary changes in the ceramic industry. This new process will also affect the aluminium oxide abrasive grit industry. After heat treatment at the above temperature, the hardness can reach RA90 or more.

black aluminum oxide 70 grit abrasive media with low Ti2O3 content does not turn blue. The chemical hardening method is to impregnate the abrasive with phosphoric acid or chromic acid, and then heat-treat it at 700 ~ 1200 ℃, which can greatly improve the hardness and strength of the abrasive. The chemical hardening method not only has a small abrasive, but also can greatly reduce the firing temperature of sintered 120 grit aluminum oxide harbor freight (down to 700 ~ 1000 ℃).

white aluminium oxide
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Brown Fused Alumina And White Fused Alumina MOQ: 1 Ton! 19 Years Manufacturing Exprience, 35,000m² Workshop Area, Factory Price, Free Samples, Fast Delivery!

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