High-performance dual-shape, dual-scale WC cemented carbide

       WC crystal belongs to the hexagonal crystal system, and the anisotropy of the hexagonal system crystal makes the physical and mechanical properties of WC crystal grains different in each crystallographic direction or plane. The hardness of the WC(0001) base surface is twice that of the WC(10-10) surface. When a certain amount of plate-like WC is contained in the cemented carbide, through the anisotropy of the plate-like WC grain properties and control its distribution in the cemented carbide, a dual-morphology with better performance than ordinary cemented carbide can be prepared Cemented carbide.



In the study of the morphological changes of WC on the properties of cemented carbide, it was found that by reasonably adjusting the plasma ball milling process, the WC morphology can be controlled to be prismatic or plate (lamellae) in the subsequent sintering process.

 On this basis, a cemented carbide with dual-morph WC grains was designed and prepared by adjusting the process method. The WC morphology on different cross-sections shows that the WC morphology can be adjusted to prismatic and plate by adjusting the milling time. shape. In the research on the improvement of mechanical properties by the content of plate-like WC, the proportion of different forms of WC in the cemented carbide matrix and the arrangement of plate-like WC were controlled through reasonable design.



At present, under the premise of maintaining high hardness of the obtained WC-8Co cemented carbide, the strength controllability is realized. The mechanical properties of cemented carbide are mainly shown as follows: hardness = 91.5 ~ 93.0 HRA, TRS = 3300~ 4000 MPa, KIC = 17.5 ~ 21.5 MPa*m1/2.