Alumina wear-resistant ceramics have been widely used in various fields of industrial production because of their excellent wear resistance, impact resistance and corrosion resistance. Therefore, they can well protect industrial equipment, reduce the impact from materials and extend the service life of the equipment. Then, why is the wear resistance of alumina ceramics so high? What factors affect the wear resistance of alumina ceramics?

1. The grain size of wear-resistant ceramics

Research on the wear resistance of alumina and zirconia ceramics has found that when the grains are small, the main deformation is plastic deformation and partial transgranular fracture, resulting in slight wear; when the grain size is large, the main fracture mode within the material is intergranular fracture, with large grains being pulled out as a whole from the interior of the material, causing severe wear. Therefore, as the grain size decreases, the wear resistance of ceramics gradually improves.

2. Porosity

In wear-resistant ceramics, porosity has a significant impact on the performance of the ceramics. Porosity is equivalent to a kind of defect, which can cause stress concentration, accelerate crack propagation, reduce the bonding strength between grains, and seriously affect the mechanical properties of ceramic products. Under the action of frictional force, pores may connect with each other to form crack sources, accelerating the wear of the material. The existence of pores can greatly reduce the wear resistance of ceramic products. Some studies have also shown that under different loads, when the porosity increases, it is easy to cause intergranular fracture, trigger abrasive wear, and accelerate the wear process.

3. Grain boundaries and inter-granular impurities

The wear-resistant ceramics are composed of grains, grain boundaries and pores, etc. During the sintering process, some additives and impurity components added to the ceramics exist on the grain boundaries in the form of a second phase or glass phase. Their presence will have a certain impact on the bonding strength between the grains. During the ceramic friction and wear process, cracks are prone to occur at the grain boundaries. The low grain boundary bonding strength will cause transgranular fracture during the wear process, leading to the pull-out of the entire grain and causing severe wear.

Pingxiang Chemshun Ceramics Co., Ltd. has been conducting in-depth research on ceramic materials for many years and is capable of producing high-quality wear-resistant ceramics, such as wear-resistant ceramic linings, alumina ceramic tiles, alumina ceramic tubes, rubber ceramic liners, and various other wear-resistant ceramic products. These products all possess characteristics of high strength, high hardness, wear resistance, and corrosion resistance, and can be widely applied in industries such as non-metallic minerals, cement, steel, chemical engineering, and power plants. If you are interested, please feel free to contact us:office@chemshun.com