Corundum castables are more expensive than ordinary castables because of their relatively high aluminum content, but good products can be used for a long time, just like corundum castables, which are longer than other castables because of their high aluminum content. However, we often see two kinds of corundum castables, one is corundum high strength and wear-resistant castable, one is corundum mullite high strength and wear-resistant refractory castables, and the two castables that appear to contain corundum are actually very different in performance, corundum and Corundum mullite What is the difference?
Corundum firebrick, chrome corundum firebrick, titanium corundum firebrick and so on. Firebrick containing more than 90% Al2O3 is called corundum refractory brick, also known as pure alumina refractory brick product. Corundum hardness is high (for Mohs hardness level 9), melting point is also high. These are closely related to the firmness of the Al - 0 bond in the structure. Therefore, a-Al2O3 is the main material for producing high-temperature refractory bricks and high temperature electrical insulation materials. Corundum firebrick has good stability against acid, alkaline slag, metal and glass solution. Its oxidizing atmosphere at high temperatures or in a reducing atmosphere can achieve good results. The basic material of corundum firebrick is fused corundum or sintered corundum.
Corundum and Corundum mullite The main difference is the performance. Corundum high strength wear-resistant castable is mainly wear-resistant and fire resistant. Corundum mullite The quality, high strength, wear-resistant and refractory castables are mainly thermal shock resistance. But the East furnace manufacturer can tell you that the aluminum content of corundum mullite castable is not high as that of corundum high strength castable.