Spark Plasma Sintering of a Hard Metal Powder Obtained from Hard Metal Scrap

Authors :: Angélica da Cunha dos Santos
Ana Lúcia Diegues Skury
Angelus Giuseppe Pereira da Silva
Source :: Materials Research, Vol 20, Iss suppl 2, Pp 10-13 (2017)
Publication Year :: 2017
Publisher :: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol), 2017.
Abstract: Spark plasma sintering is used to consolidate a WC-Co powder produced from milled discharged hard metal cutting inserts. The powder was mixed to 10%wt Co powder and spark plasma sintered (SPS) under 80Mpa pressure, at 1200ºC with heating rate of 160ºC/min. A reference alloy was prepared with a commercial WC powder and 10%wt. Co under the same conditions. The structures of both alloys were investigated by means of scanning electron microscopy and Vickers hardness. The results show structures with densities and hardness at the same level. SPS can be used to produce hard metal pieces directly from scrap powder without any prior chemical and thermal treatment.