Effects of Particle Size and Composition of Cobalt Powder on Microstructure and Properties of Submicron-Grained WC-10Co Cemented Carbide AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TG135.5[一般工业技术—材料科学与工程]

Citation Information:

The effects of the particle size and composition of cobalt powder on the physical and mechanical properties of submicron-grained WC-10Co cemented carbide were investigated.The results show that for the same sintering process,the finer the cobalt powder,the higher the surface energy,the lower the melting temperature,the longer the alloy densification time,and the cobalt vapor volatilization time also increases correspondingly.As the particle size of cobalt powder decreases,the density of the alloy increases,while the hardness and magnetic coercive force decrease,and the bending strength increases at first and then decreases,reaching its maximum when the particle size of cobalt powder is 0.73μm.The content of Cl in cobalt powder is also one of the important factors affecting the pores of cemented carbides.When the Cl content reaches 550×10^-6,a large number of pores appear inside the alloy.To obtain submicron-grained cemented carbides with excellent properties,it is necessary to strictly control the composition of raw materials,and adjust the production process,shorten the ball milling time,and reduce the sintering temperature.The submicron-grained WC-10Co cemented carbide,prepared using cobalt powder with a FSSS particle size of 0.73μm and Cl content of 171×10^-6,has a bending strength of 4231 N/mm~2,a hardness of 91.8 HRA,a density of 14.45 g/cm~3 and a magnetic coercive force of 19.1 kA/m.