Abstract
Mechanical properties of ultra-fine grained cemented carbides with 12wt% Co binder produced by pulsed-electric current sintering were compared with those of cemented carbides by conventional vacuum sintering. The cemented carbides prepared by pulsed-electric current sintering had 6% higher hardness and 23% higher fracture toughness. These excellent properties seemed to be caused by ultra-fine WC grains and flattened Co phase in the sintered compacts. The flattened Co phase tended to be arranged in a perpendicular direction against a pressurized direction during sintering. However the increasing effect of fracture toughness by the flattened Co became small according to decreasing of Co contents. The fracture toughness of the compacts with Co binder less than 2wt% Co sintered by pulsed-electric current process was about 8% smaller than that by conventional process. But the hardness was about 20% higher than that by conventional process. The transverse rapture strength of ultra-fine grained cemented carbides sintered by pulsed-electric current process was about 28% smaller than that by conventional process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Japan Society of Powder and Powder Metallurgy
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
