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Journal of Materials Science

, Volume 40, Issue 19, pp 5167–5172 | Cite as

Recycling process of WC-Co cermets by hydrothermal treatment

  • T. Kojima
  • T. Shimizu
  • R. Sasai
  • H. Itoh
Article

Abstract

Hydrothermal extraction process of Co binder phase from WC-Co cermet was investigated in order to establish a novel recycling system of WC-Co cermet scraps. When the cermet chips were hydrothermal-treated in hydrochloric acid above 110C, Co binding phase was efficiently extracted and the cermet chips were disintegrated into relatively large fragments. After hydrothermal treatment, WC sintered body become very brittle and pulverized easily by ball milling and the mean particle size of thus obtained WC particle became similar to that of virginal WC particle. The recycled WC powder was a little easier to undergo oxidation than the virginal WC powder, so that the mechanical properties of recycled WC-Co cermets were degraded. However, the degradation of mechanical properties was prevented only by drying the WC powder more carefully. This hydrothermal process will be one of the recycling systems for WC-Co cermets.

Keywords

Oxidation Polymer Particle Size Mechanical Property Brittle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • T. Kojima
    • 1
    • 2
  • T. Shimizu
    • 1
  • R. Sasai
    • 1
  • H. Itoh
    • 1
  1. 1.Department of Applied Chemistry and Biotechnology, Faculty of EngineeringChiba UniversityChibaJapan
  2. 2.EcoTopia Science Institute, Division of Environmental ResearchNagoya UniversityNagoyaJapan

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