Reactive Sintering of Bimodal WC-Co Hardmetals

Authors

  • Marek Tarraste Tallinn University of Technology Department of Materials Engineering
  • Kristjan Juhani Tallinn University of Technology Department of Materials Engineering
  • Jüri Pirso Tallinn University of Technology Department of Materials Engineering
  • Mart Viljus Tallinn University of Technology Centre for Materials Research

DOI:

https://doi.org/10.5755/j01.ms.21.3.7511

Keywords:

hardmetals, reactive sintering, bimodal, mechanical properties, microstructure

Abstract

Bimodal WC-Co hardmetals were produced using novel technology - reactive sintering. Milled and activated tungsten and graphite powders were mixed with commercial coarse grained WC-Co powder and then sintered. The microstructure of produced materials was free of defects and consisted of evenly distributed coarse and fine tungsten carbide grains in cobalt binder. The microstructure, hardness and fracture toughness of reactive sintered bimodal WC-Co hardmetals is exhibited. Developed bimodal hardmetal has perspective for demanding wear applications for its increased combined hardness and toughness. Compared to coarse material there is only slight decrease in fracture toughness (K1c is 14.7 for coarse grained and 14.4 for bimodal), hardness is increased from 1290 to 1350 HV units.

DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7511

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Published

2015-07-27

Issue

Vol. 21 No. 3 (2015)

Section

METALS, ALLOYS, COATINGS

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