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Professor Li Zaigeng and others from Luoyang Refractory Research Institute of China completed the research on the direct electrofusion of bauxite with brown fused alumina content of ≥98.5% corundum during the Eighth Five-Year Plan period, and produced Type I sub-white corundum with Al2O3 content of ≥98.0% and Type II corundum with Al2O3 content ≥98.5% has taken a unique new way to produce higher purity aluminium oxide abrasive grit in China.

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Sub-brown aluminum oxide is a very promising refractory material. β-Corundum is based on industrial alumina. Na2O is introduced during melting. The Na2O in corundum is controlled at 5% ~ 7%, so that the main crystal phase forms Na2O · 11Al2O3, which is β-Al2O3. Its density is 3.25g / cm3, melting point. At 1600 ° C, the fused aluminum oxide thermal expansion coefficient is smaller than that of α-Al2O3, and it is converted into α-Al2O3 at about 2000 ° C to decompose Na2O.(cheap brown fused aluminium oxide suppliers indonesia)

When casting stainless steel, the body of the submerged nozzle is mostly made of Al2O3-SiC-C material. The main brown aluminium oxide crystal phase of sapphire corundum is α-Al2O3, the secondary crystal phase is iron spinel, the bulk density is 3.7 ~ 3.9g / cm3, and the fire resistance is usually greater than 1800 ° C.  Its resistance to black synthetic corundum melt erosion is good, and it is often used as a glass kiln lining material. Synthetic alumina is an innovative product of China in the 1980s.

(cheap brown fused aluminium oxide suppliers indonesia)C and SiC in the material are oxidized by oxygen in the white alumina molten steel and FeO, Cr2O3, MnO, etc., to reduce Fe, Cr, and replace C, resulting in the formation of a deteriorated layer in the inner hole of the nozzle and around the steel outlet, which continuously expands and hinders casting. Submerged nozzle brick made of β-corundum instead of Al2O3 (mostly used as coarse particle part, and fine powder part is still α-Al2O3), aluminium oxide blasting grit which greatly reduces the deterioration layer and greatly improves the anti-stripping property.

The reason is that Na2O is released at high temperature and reacts with CaO and SiO2 in steel slag to form a glass film on the black corundum working surface to prevent graphite oxidation and slag component intrusion and Al2O3 deposition in molten steel. Blue corundum is also called low-alumina artificial corundum, which is made of high-speed bauxite clinker as the main raw material and melted and crystallized in an electric arc furnace at high temperature.(cheap brown fused aluminium oxide suppliers indonesia)

By adjusting the ingredients, the ratio of the main pink corundum crystalline phase to the sub crystalline phase is controlled to meet the different requirements of refractory materials (Al2O3 ≥ 80%) and abrasives (Al2O3 ≥ 73%). Refractory alumina is successfully used instead of white corundum as an aggregate for ironmaking cannons; cutting wheels made of abrasive alumina are better than similar abrasive wheels made of aluminum oxide blasting abrasive.

(cheap brown fused aluminium oxide suppliers indonesia)Samarium zirconia corundum is made by calcining alumina or bauxite, adding zirconia or zircon sand, and arc fused alumina melting them together in an electric arc furnace. According to the content of ZrO2, there are generally low zirconium corundum (ZrO210% ~ 15%), medium zirconium corundum (ZrO225%) and high zirconium corundum (ZrO240%). Zirconium corundum is generally gray-brown with a density of glass bead blasting media suppliers about 4.05g / cm3.