Alumina Ceramic Liner Wear-resistance Research In Dense Medium Cyclone

With the rapid development of coal industry, the wear resistance of the heavymedium cyclone is valued. So it has been researched in recent years.On the basis of the original alumina ceramic formula, the best molding pressure,holding time and firing temperature were found by the study of forming method andsintering process of alumina ceramic. Under the same firing system, SiC, Si3N4and BNwere added in the original alumina ceramic mixture with different dosage in order toobserve and analyze the wear of the sintered product.Through testing XRD, volume density, hardness, SEM, fracture toughness and wearloss of sintered products, microscopic structures and the mechanical properties had beenresearched.The results show that the wear resistance of the sintered product is the best when themolding pressure is6MPa and the holding time is60s and the maximum firingtemperature of1550℃. With the SiC content increased, the material loss unit areadecreased first and then increased. When the SiC content is3%-4%, the material loss unitarea is the minimum. With the Si3N4content increased, the material loss unit areadecreased first and then increased. When the Si3N4content is3%, the material loss unitarea is the minimum. With the BN content increased, the material loss unit area isreduced., but it still lower than that in the original mixture. When the BN content is1%,the material loss unit area is the minimum.In addition, the alumina and three self-fluxing powder the most common wereuniform mixture. The liquidity was improved through the powder granulation. Analumina composite coating was made in the Q235#steel by the method of the plasmacladding, improving the wear of the heavy medium cyclone.