The Differences Between Natural Corundum and Artificial Fused Corundum

- Jan 26, 2018 -


The Differences Between Natural Corundum and Artificial Fused Corundum

Corundum is widely used in abrasives and refractory materials it is also called carborundum, refers to brown fused alumina, white corundum, black corundum, or brown fused corundum, white aluminum oxide, black fused alumina. In general, fused corundum often used for abrasive sandblasting grit, water jet cutting, and terrace industries. So we call all these corundum used in industry carborundum. But in fact some are natural corundum, some of them are artificial corundum. So Here we will talk about the differences between natural and artificial corundum.

First, the composition of natural corundum and fused corundum are different. 

The main ingredient of natural corundum is Fe-Al silicate. In addition, It contains TiO2, MgO, FeO, CaO, MnO, and so on. The natural diamond is the outcome of a series of geological . The main ingredient is artificial corundum Al2O3, is produced by the sand and large amount of carbon heated in an electric furnace.

Second, the hardness of natural corundum and fused corundum are different. 

Hardness of natural corundum is high in non-metallic material, second only to diamond and corundum in nature, Mohs 7.0-8.5. The hardness of natural corundum is between 7.5-8.0. Its usage is relevant with the hardness. Artificial corundum hardness is about 9.5 Mohs. Although it is harder than the former, the price is several times of the former. However, using the former can achieve good performance. 

Third, the color of natural corundum and fused corundum are different. 

Natural corundum has a various kind of colors, the most common color is red and pink. As for industrial using, is generally almandine garnet. The fused corundum also in brown, white and black color.

Fourth,  the usages of natural corundum and fused corundum are different.  
Compare with natural corundum, the artificial corundum, such as brown fused corundum, white aluminum oxide, black fused alumina
are mainly used in abrasive tools, sandblasting grit, refractory materials.