What are rebonded sintered corundum bricks

1. Definition and characteristics

Rebonded sintered corundum bricks are a high-performance refractory material, which is mainly made of sintered corundum particles and corundum fine powder (or fused corundum fine powder) through a specific process. This type of product is mainly composed of alumina, and the alumina content is usually greater than 90%. It has extremely high refractoriness and excellent physical and chemical properties. Its characteristics include high refractoriness (≥1800℃), high melting point (up to 2050℃), good thermal shock resistance, slag erosion resistance and volume stability.

2. Production process

The production process of rebonded sintered corundum bricks is complex and delicate. First, high-quality industrial alumina is selected as the raw material, and it undergoes pretreatment steps such as fine grinding and impurity removal. Subsequently, the treated alumina particles are mixed with fine powder in a certain proportion, and an appropriate amount of binder (such as phosphoric acid, phosphate, etc.) is added to form a green body through high-pressure forming technology. Finally, sintering is carried out in a high-temperature kiln (generally at 1650-1850℃) to tightly combine the alumina particles in the green body with the fine powder to form a dense corundum structure.

3. Application fields

Due to the excellent refractory properties and physical and chemical stability of re-bonded sintered corundum products, they are widely used in high-temperature kilns in metallurgy, chemical industry, electric power, building materials and other industries. As a lining material or thermal insulation material, it can withstand high temperatures and sudden temperature changes to protect the kiln structure from damage. At the same time, its high hardness and wear resistance also make it an ideal substrate for abrasive materials such as grinding wheels and abrasive belts, and it is widely used in metal processing, glass processing and other fields.

In summary, re-bonded sintered corundum bricks are a high-performance refractory material. Its excellent performance and wide application fields make it one of the indispensable and important materials in modern industry.