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In the precursor precipitate of NH, Al2 (OH) 2CO dried at 80 ℃, 5% nano-a-al2o3 seed crystal (white aluminum oxide particle size is about 20nm) was added, anhydrous ethanol was used as dispersant, and high-purity Al2O3 medium was used for ball milling for 24h. After drying, it was ground through 200 mesh sieve, silicon carbide price and then calcined at 1100 ℃ to obtain loose white powder, they can also be grinded to nano scale, a-Al2O3 nano powder.

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The pink corundum powder and distilled water are mixed into a suspension with a solid volume fraction of 15%. After the dispersant is adsorbed and balanced on the particle surface, the particle size of the suspension is measured by a potential particle sizer, and the suspended particle size is divided by a high-speed centrifuge A-Al2O3 nano powder with narrow particle size was obtained. The pH value of the suspension is adjusted to 8, 220 grit aluminum oxide and then ultrasonic dispersion is carried out.

(cheap black silicon carbide manufacturers vietnam)Then calcined at 1100 ℃ to obtain loose white corundum powder, which is a-al203 nano powder. After filtration, washing, ultrasonic dispersion in distilled water, the shape of the sol particles was observed by transmission electron microscope to study the effect of aluminum sulfate solution concentration on the morphology of Al (OH) 3 sol particles.  After introducing surfactants (green carborundum also known as grinding aids), for example, adding 0.04% triethanolamine into a-Al2O3 powder.

According to the research of Zhengzhou University, brown fused alumina price adding 1% ZnF2 + 1% seed (a-Al2O3 nano powder, the average particle size is less than 100nm, the specific surface area is 40 ± 5m2 / g), or adding 3% ALFS + 1% seed, the phase transition temperature is reduced, calcining at 950 ℃ for 1H, the grains of 32 nm and 37 nm ral2o can be obtained respectively. There are many ways to prepare a-Al2O3 80 grit aluminum oxide powder, such as sol combustion, ultrasonic dispersion and so on.(cheap black silicon carbide manufacturers vietnam)

Nanometer rice noodles. A1 (OH) 3 sol was prepared from white alumina sulfate solution of different concentrations (0.426-0.855mol / L) by slowly dropping ammonia water ammonium chloride buffer solution containing polyethylene glycol (pH value is about 9.5) under the condition of constant agitation. The results show that when the concentration of fine grit aluminum oxide sulfate solution is 0.65mol/l, which is made of spherical Al (OH) 3 colloidal particles as precursor.

(cheap black silicon carbide manufacturers vietnam)After the suspension is stirred evenly and dispersed by ultrasound, a certain amount of white fused alumina polycarboxylate ether (dispersant) is added. The spherical Al (OH) 3 sol was extracted and filtered, soaked in absolute ethanol for 24 hours, filtered, dried at 120 ℃ for 1.5 hours, and calcined at 1150 ℃ for 1 hour to prepare nano-a-al2o3 powder. The results of XRD and FEM show that the nano aal2o3 powder, is also spherical and silicon carbide abrasive grit has good fluidity and filling property.

A-Al2O3 black corundum powder can also be prepared by high-speed planetary mill and high-energy ball mill. The mechanical method has been introduced to prepare a-Al2O3 ultrafine powder. The particle size of the nanometer powder is slightly smaller than that of the ultrafine powder. As long as the rolling time is extended, a-Al2O3 nanometer powder can be prepared regardless of grinding, ball milling or sand grinding dispersion, the 180 grit aluminum oxide particles are spherical.