Spark plasma sintering of WC-Co tool materials prepared with emphasis on WC core-Co shell structure development

作者：Lee Sungkyu; Hong Hyun Seon; Kim Hyo Seob; Hong Soon Jik; Yoon Jin Ho^*

来源：International Journal of Refractory Metals and Hard Materials, 2015, 53: 41-45.

DOI：10.1016/j.ijrmhm.2015.04.014

• Nanopowders
• Wet chemical reduction
• WC-Co composite
• Mechanical alloying
• Spark plasma sintering

Quasi-nano-sized WC core-Co shell structure composites were successfully fabricated by the wet chemical reduction method by introducing uniformly dispersed WC powders of 300-nm size into the Co(OH)(2), which was subsequently reduced to Co shell structure by drop-wise titration of H3PO2. X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) identified WC core-Co shell phases which were subsequently ball-milled, compacted and finally densified at 1400-1450 degrees C by spark plasma sintering. WC-Co sintered composites thus prepared were analyzed to examine densification, hardness and fracture behavior: reasonably adequate post-sintering properties are attributable to improved WC core-Co shell structure afforded by the optimized mechanical alloying and SPS sintering processes.

• 出版日期2015-11