Carbide Hood Accessories

Tobacco machinery usually work at high speed , so some of the tobacco machinery accessories must have good abrasiveness.Compare with other metallic materials, cemented carbide are of better abrasiveness and the surface of cemented carbide accessories are more smooth. For its excellent properties , cemented carbide are widely used in tobacco machinery.In this research, we choose the right sort of cemented carbide firstly .Then we devise the molding and sintering technics, also ascertain technical parameters of molding and sintering.If cemented carbide has good abrasiveness, it is hard for cemented carbide accessory's machining, because the hardness of the material will be high and the material are brittleness. The influence of additive on the properties of cemented carbide has been studied, we added rare-earth oxide such as Y₂O₃, CeO₂ La₂O₃ into WC-Co powder in order to improve the properties of cemented carbide, especially the abrasiveness. The result show that rare-earth oxide allow for substantially improving the abrasiveness of the material, the hardness are also improved but not very remarkable.The result is that if we add 1. 2% CeO₂. into YG6X powder, the property of material will be better than which we didn't add rare-earth oxide, some parameters of this cemented carbide are as below:Density:14. 293 g/cm³â€”14.361g/cm³;Hardness :88HRA⁹0HRA;Cubage abrasion:0. 613×10^-30.441×10^-3cm³The transformation of structure after added rare-earth oxide are analyzed by XRD, SEM and EDS , the result show that the rare-earth oxide disintegrated the WC grain size, the influence of rare-earth oxide on WC grain size in cemented carbide is decided by two finely disintegrated role and one precipitate growth role;also rare-earth oxide improved Co phase. Thus the properties of cemented carbide are improved.