Research on Ultrafine WC-10Co Cemented Carbide with High Propertie

1 IntroductionMaterials scientists overthe world have been workingto seek for materials with both high hardness and hightoughness. The ultrafine grained WC-Co (cobalt-bondedtungsten carbide) is one of ideal materialstill now.Nano-crystalline WC-Co cemented carbides have both highhardness and hightoughness[1-8].Submicron hardmetals are used as wear parts ,circu-lar shearing and cutting blades , magnetic video tapes ,chipless formingtools ,dental tools and others .The per-formances of these t…

Research on Ultrafine WC-10Co Cemented Carbide with High Properties

WC-10Co nanocomposite powder produced by spray pyrolysis-continuous reduction and carbonization technology was used, and the vacuum sintering plus sinterhip process was adopted to prepare ultrafine WC-Co cemented carbide. The microstructure, grain size, porosity, density, Rockwell A hardness (HRA), transverse rupture strength (TRS), saturated magnetization and coercivity force were studied. The experimental results show that average grain size of the sample prepared by vacuum sintering plus sinterhip technology was about 420 nm, transverse rupture strength was more than 3460 MPa, and Rockwell A hardness of sintered specimen was more than 92.5. Ultrafine WC-10Co cemented carbide with high strength and high hardness is obtained.