New Design of Microstructure of WC-Co/TiC-Al₂O₃ Composite Materials by Mechanical Coating of Particles

抄録

In order to design a microstructure of a sintered composite material as uniform as possible, an experimental investigation was carried out by preparation of WC particles coated with Co, Al₂O₃, and TiC by high-speed rotational impact blending. The composite material was then fabricated by spark plasma sintering. The compositions were changed with different ratios of TiC to Al₂O₃. The comparatively uniform microstructure was obtained corresponding to the coated particle model. The composition of 55WC-10Co-30TiC-5Al₂O₃ yielded the highest values of Vickers hardness and transverse rupture strength due to uniform dispersion of each component and generation of A12O3 particulate reinforcement effect with less pores than other compositions.