Ni nanoparticles were precipitated on TiN powder via a rotary chemical vapour deposition (RCVD) method. The sintering behaviour and mechanical properties of the TiN, mixture of TiN and Ni, noted as TiN-Ni(blended), and Ni-precipitated TiN, noted as TiN-Ni(CVD), powders sintered by spark plasma sintering (SPS) were compared. The effects of O2 gas partial pressure (PO2) in RCVD and of sintering temperature in SPS (TS) on the crystalline phase, relative density (Dr), Vickers hardness (HV) and fracture toughness (KIC) of TiN-Ni(CVD)-sintered bodies were investigated. The mechanical properties of TiN ceramic were improved as CVD-deposited Ni as sintering aid for sintering. TiN-Ni(CVD) body-sintered at TS=1600°C from TiN-Ni(CVD) powder prepared at PO2=160 Pa exhibited the highest Dr of 97.9% and HV=15.5GPa, higher than those of TiN- and TiN-Ni(blended)-sintered bodies, and relatively high KIC=3.8MPam1/2.
|ジャーナル||Journal of the European Ceramic Society|
|出版ステータス||Published - 2014 8|
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