Aluminium Oxide (Al2O3 ) or alumina is one of the most versatile of refract ory ceramic oxides and finds use in a wide range of applications. High alum ina refractories are alumina refractories containing more than 45% alumina.
High alumina bricks is made of high-quality bauxite chamotte as raw materia ls by shaping at high pressure and sintering at high temperature. Alumina i s one of the most chemically stable oxides known, which offers excellent ha rdness, strength and spalling resistance, which imparts high alumina refrac tories great features.
The alumina content ranges from 45 to 100%. The refractoriness of high alum ina refractories increases with increase of alumina content. So high alumin a refractories have high refractoriness and excellent high temperature perf ormance.
High alumina refractories are a kind of acid refractories. Therefore, they have good resistance to acid slags. High alumina refractories are also feat ured with high cold crushing strength. As the alumina content increases, th e cold crushing strength also increases. This makes them to bear more load during use. The high hardness of alumina imparts high wear and abrasion res istance.
Manufacturing cost and price of these brick increase more rapidly with % al umina content, so it is essential to determine experimentally or by test in stallations the most economical alumina content for each service. In some a reas such as the regenerators, fire clay bricks can be used as a replacemen t for high alumina refractories.
Due to severe service conditions prevailing in modern reheating furnaces, t here is an increasing tendency to use more and more of high alumina bricks in place of conventional fireclay bricks. The applications of high alumina refractories includes the hearth and shaft of blast furnaces, ceramic kiln s, cement kilns, glass tanks and crucibles for melting a wide range of meta ls.
Sunrise Refractory is refractory supplier from China, providing high qualit y high alumina refractories in various shapes at competitive prices.