A novel ZrB2–VB2–ZrC composite fabricated by reactive spark plasma sintering
作者： Mehdi Shahedi Asl , Behzad Nayebi , Zohre Ahmadi , Soroush Parvizi , Mohammadreza Shokouhimehr
DOI: 10.1016/J.MSEA.2018.06.008
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摘要: Abstract The development of a novel ZrB2–VB2–ZrC composite using ZrB2, vanadium and graphite nano-flake powders via reactive spark plasma sintering was studied. in-situ formation VB2 ZrC enhance the densification, sinterability mechanical properties. A relative density 99.17% achieved for ZrB2–20 vol% VB2–20 vol% after RSPS at 1900 °C 7 min under 40 MPa. hardness fracture toughness are improved by 50% 40%, respectively, in comparison with monolithic ZrB2 ceramic. Thermodynamic calculations microstructural analyzes revealed that formed phases derived from reaction between transient VC phase matrix. These were also found to be strong inhibitors grain growth, consequently result Due discussions about mechanism, characteristics influences such refractory reinforcement investigated schematically illustrated.
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