期刊
RARE METALS
卷 30, 期 1, 页码 63-67出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-011-0198-4
关键词
composite materials; tungsten carbide; cobalt; graphite; spark plasma sintering; microstructure; mechanical properties
资金
- National High-Tech Research and Development Program of China [2006AA03Z512]
Ultrafine WC-11Co hard metals added with different proportions of graphite were prepared by spark plasma sintering at 40 MPa/1200 degrees C for 5 mm, and the influence of graphite as free carbon on the microstructure and mechanical properties were investigated. The XRD analysis showed that decarbonization could be prevented by adding graphite. Compact hard metals composed of finer and more homogeneous WC grains with little flaws can be achieved after 0 wt.% to 1.5 wt.% graphite was added. The hardness and fracture toughness increase initially with increasing graphite content, and with over 1.5 wt.% they descend due to coarse grains and more defects. Therefore, 1.5 wt.% graphite is the optimal addition content in view of the hardness and transverse rupture toughness. Furthermore, the coercive force decreases while the saturated magnetic intensity increases with the increase of graphite content.
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