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What is the physical structure of brown alumina?


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It is necessary to make a simple understanding of the structure of brown corundum , so as to prevent the occurrence of undesired quality problems. Microscopic examination of brown corundum shows that it is formed of α-alumina grains and is stuck by a small amount of glassy slag Simultaneously. Satisfactory brown corundum satisfies the typical technical conditions. It is formed of more than 95% of α-alumina crystals and is composed of a solid solution of Al2O3 containing Ti2O3.

Most of the glassy slag is composed of silicon dioxide, titanium dioxide, and other trace oxides remaining in the electric arc furnace. These oxides form a glass phase, which has a relatively low solubility in the crystal structure of α-alumina grains. The amount of glassy slag and the spread of impurities between α-alumina grains are the main factors affecting the function of brown corundum. Alpha-alumina rewards brown corundum with hardness and high melting point, while retention of glassy phase and impurities rewards brown corundum for toughness or resistance to breakage.

For brown corundum that satisfies the requirements of exemplary techniques, the fusion ratio of silica and titanium dioxide fancy in glass is theoretically close to 1: 1. If too much silica is fancy in glass, excess silica cannot be stored. Remain fancy glass, but react with a part of alumina natural mullite (2SiO2 (3Al2O3)), which will reduce the toughness of brown corundum . On the other hand, if there is excess titanium oxide (TiO2) in brown corundum, then Can't save fancy glass, but react with alumina. Natural aluminum titanate (TiO2 (Al2O3)). Aluminum titanate is the third phase at the interface between α-alumina grains and glass phase, which will cause α-alumina. Weakening of the intergranular glass phase.

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