- Time:Apr 27, 2023
Although silica bricks and high alumina bricks are both refractory materials, there are great differences in their chemical composition, physical properties and scope of application, so they cannot simply replace each other. The following are some basic characteristics and applicable occasions of silica bricks and high alumina bricks, which can clearly understand why silica brick cannot replace high alumina brick.
1. Chemical composition
Silica brick: It is mainly composed of silica, and the silicon content is usually above 95%.
High alumina brick: It is mainly composed of alumina, and the alumina content is usually between 45% and 80%.
2. Physical properties
Hardness: High alumina bricks are harder than silica bricks and more resistant to abrasion.
Cold and heat cycle resistance: Silica bricks are more resistant to cold and heat cycles than high alumina bricks.
Acid and alkali erosion resistance: Silica bricks are more resistant to acid and alkali erosion than high alumina bricks.
3. Applicable occasions
Silica brick: suitable for non-ferrous metal smelting, ceramic industry and other fields under high temperature environment.
High-alumina bricks: suitable for high-temperature equipment in industrial fields such as steel, cement, and glass.
Therefore, silica bricks and high alumina bricks have their own scope of application and cannot replace each other. In specific applications, it is necessary to comprehensively consider factors such as equipment type, operating environment, and specific process requirements, and select refractory products that meet the requirements to ensure the normal operation and durability of the equipment.
