At present, in the market of ultra-fine powder processing, airflow classification is an important means to obtain narrow distribution and ultra-fine particles. For some magnetic pollution sensitive material processing technology, ceramic grading wheel must be used, and the involvement and manufacturing of grading wheel is the core process of the whole equipment. Our newly developed ceramic grading wheel can provide help. Most of the ceramic grading wheels are made of zirconia and alumina, Compared with traditional ceramic materials, our newly developed silicon nitride ceramic grading wheel has better wear resistance, higher strength, anti adhesion and low density. Our company can produce all kinds of ceramic grading wheel products according to customers' design requirements.