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Journal of Materials Science

, Volume 15, Issue 9, pp 2335–2344 | Cite as

The sinterability of ultrafine WC powders obtained by a CVD method

  • Junichi Hojo
  • Ryoichi Oono
  • Akio Kato
Papers

Abstract

The sintering behaviour of ultrafine WC powders produced by a CVD method (particle size <0.3μm) and commercial WC powders (particle size ~ 1μm) is investigated in hydrogen and in vacuum. It has been found that ultrafine WC powders have an extremely high sinterability and give a sintered body with a relative density of 100% by sintering at a considerably lower temperature than normal, such as 1750° C. Also WC powders with a large particle size and a wide-size distribution have a high sinterability caused by the presence of fine particles and the sinterability of WC powders is influenced significantly by the sintering atmosphere. The atmospheric effect is discussed in connection with the heating behaviour of a surface oxide layer and free carbon.

Keywords

Oxide Polymer Particle Size Relative Density Oxide Layer 
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

© Chapman and Hall Ltd 1980

Authors and Affiliations

  • Junichi Hojo
    • 1
  • Ryoichi Oono
    • 1
  • Akio Kato
    • 1
  1. 1.Department of Applied Chemistry, Faculty of EngineeringKyushu UniversityFukuokaJapan

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