Brown aluminum oxide is also known as corundum. The raw materials for the production of artificial corundum are bauxite, iron filings and carbon materials, which are made by high-temperature melting and reduction. In industrial production, brown fused alumina plays a very important role, so how should enterprises distinguish the quality of brown fused alumina powder when choosing brown fused alumina powder? Let me introduce it to you today.
Look at the color first. The color of brown aluminum oxide is usually brown and translucent. If the color of brown aluminum oxide is lighter, it has high aluminum content and appears shiny brown. Under the sunlight, brown corundum has high transparency. Relatively speaking, if the color of brown corundum is darker with a little cyan, then this kind of brown corundum will have greater hardness, higher wear resistance, and higher iron content.
The smaller the particles of brown aluminum oxide, the lighter the color, such as brown aluminum oxide powder, even has a light gray color, on the contrary, the larger the particles of brown corundum, the darker the color, but no matter the particle size, the material of brown corundum Are the same. Therefore, the depth of the color of brown aluminum oxide is related to the particle size.
Brown fused alumina is divided into three quality grades, the best of which is grade 1 brown fused alumina, followed by grade 2 and grade 3. The quality of brown fused alumina is mainly based on the content of Al2O3.
If the content of AL2O3 is more than 95%, it is defined as the first-grade brown fused alumina, which is often referred to as No. 95 brown fused alumina. The content of AL2O3 in the second-grade brown fused alumina and the third-grade brown fused alumina decreases step by step, and of course the quality also decreases. Generally speaking, we can judge the quality of brown aluminum oxide from its color, because brown corundum contains Fe element. The Fe element is reddish-brown, so brown corundum finally turns brown, so we can distinguish the grade and quality of brown corundum by color.
