What Is an Alumina Ball?
An alumina ball is a type of grinding ball used in ball mills. It is produced through the calcination process of alumina.
High wear resistance allows them to maintain the purity of grinding material, making them more durable than ordinary ceramic balls.
Hardness
Hardness is one of the primary characteristics that distinguishes an alumina ball. Its hardness is primarily determined by the sintering temperature of the raw material, which in turn determines its strength and density.
Alumina can be enhanced in hardness by doping it with carbide. This enhances the ball’s resistance to wear and increases its lifespan.
In addition to increasing the hardness of alumina, doping it with carbides also enhances its corrosion resistance. Carbide doping greatly enhances alumina’s resistance to acids and alkalis, which is important for applications in food processing industries.
Repetitive sliding tests of alumina and steel balls revealed a gradual or stable wear depth. This behavior was similar to self-lubricating materials, which create a layer at the interface that stabilizes and reduces further wear.
Wear Resistance
The wear resistance of an alumina ball is an important criterion for the quality of its formation and firing processes. These balls are widely used in ceramics, cement, paints, dyes, chemicals, pharmaceuticals and coating industries.
Alumina ball are commonly used as grinding media in ball mills of ceramics, cement, paint, refractory and mineral powder industries due to their excellent abrasion resistance and stability of grinding effects. This increases the efficiency of a ball mill.
Industry standard requires an alumina ball to have a wear resistance of less than 0.15%0 when tested under identical conditions.
Under vacuum conditions, the tribological properties of PCD surfaces are superior to those of alumina ceramics (COF = 0.53; rcs = 0.22). Furthermore, when subjected to identical loads, their wear rate is incredibly low – zero wear for PCD coated alumina balls.
Corrosion Resistant
Alumina ball are durable and resistant to high temperature, pressure, acid, alkali, salt and various organic solvents. They’re commonly used in petroleum, chemical, fertilizer, natural gas and environmental protection industries.
Alumina ball are a common choice for reactor catalysts due to their corrosion-resistant nature and ability to withstand temperatures up to 1750 degrees Celsius. Furthermore, alumina balls offer better performance than steel balls in certain applications like chemical reactions.
Furthermore, alumina ceramics can improve the distribution of liquid and gas in a reactor by buffering their impact on catalysts. This not only protects them from damage but also allows for better distribution throughout the reactor.
To investigate the effect of La2O3 on HF/HCl corrosion resistance, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed. Results revealed that adding La2O3 increased alumina ceramics’ density and acid solubility; however, its corrosion resistance did not improve.
Heat Resistant
Alumina ball are highly resistant to high heat and possess superior thermal shock resistance compared to other ceramics. This property makes them ideal for applications involving extreme temperatures or corrosive environments.
Alumina ball are widely used in industries such as petroleum, chemical, fertilizer and natural gas. They also serve as supporting and covering material for catalysts in reactors.
They are hard and dense, making them resistant to abrasion. Furthermore, these stones possess great acid and alkali resistance.
Alumina is an ideal material for applications exposed to harsh corrosive environments, such as petrochemical production. Its resistance to high temperature and abrasion helps ensure worker safety and product quality while offering excellent impact and thermal shock resistance.