Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994466 | Journal of Alloys and Compounds | 2018 | 8 Pages |
Abstract
Co-Cu composite powders with different Cu contents were synthesized via an ultra-rapid solution combustion synthesis (SCS) method and WC-10(Co/Cu) cemented carbides with an ultrafine grain size were prepared by microwave sintering the compacts of powder mixes of WC and the Co-Cu composite powders. The effects of Cu addition on the microstructure and properties of the microwave-sintered WC-Co cemented carbides were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), field emission transmission electron microscopy (FE-TEM) and mechanical properties tests. The results showed that the addition of a small amount of Cu instead of Co in the WC-Co cemented carbides enhances the sintering, restrains the WC grain growth and improves the mechanical properties. The average WC grain size decreases as Cu is added, and the grain size distribution narrows. The Rockwell hardness and fracture toughness of the WC-10(Co/Cu) alloys with a 0.5 wt% Cu addition reach 90.7 HRA and 14.3 MPa mâ1/2, respectively. In addition, the transverse rupture strength (TRS) reaches 2544.7 MPa with a 1 wt% Cu content. The present results show that Cu-doped WC-Co cemented carbides have excellent comprehensive performances.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jianfeng Li, Jigui Cheng, Pengqi Chen, Wenchao Chen, Bangzheng Wei, Junwu Liu,