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:: Volume 6, Issue 4 (3-2018) ::
2018, 6(4): 41-52 Back to browse issues page
Influence of nano-graphite addition on hardness and fracture toughness of ZrB2-SiC composites fabricated by spark plasma sintering
Abstract:   (182 Views)
ZrB­-SiC-based ultrahigh temperature composites were fabricated by spark plasma sintering and reinforced with different amount of graphite nano-flakes (0, 2.5, 5, 7.5 and 10 wt%). Sintering process was performed at a temperature of 1900 °C for a dwell time of 7 min under an applied pressure of 40 MPa in a vacuum atmosphere. The effect of graphite nano-flake on the hardness and fracture toughness of samples were studied. The results showed that with increasing the nano-graphite content, the hardness of composites linearly decreased from 19.5 GPa for the graphite-free sample to 12.1 GPa for the composite reinforced with 10 wt% nano-graphite. An inverse trend was observed for the fracture toughness of ceramics, as it was increased from 4.3 MPa.m1/2 for the graphite-free sample to 8.2 MPa.m1/2 for the 7.5 wt% nano-graphite doped composite. The drop in hardness values, with increasing the nano-graphite content, was related to the intrinsic softness of graphite phase. However, an obvious enhancement in the fracture toughness values due to the addition of more graphite nano-flakes was attributed to the activation of several toughening mechanisms in such materials.
Keywords: zirconium diboride, silicon carbide, spark plasma sintering, nano-graphite, hardness, fracture toughness
Full-Text [PDF 919 kb]   (56 Downloads)    
Type of Study: Research | Subject: Special
Received: 2018/06/18 | Accepted: 2018/06/18 | Published: 2018/06/18
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Influence of nano-graphite addition on hardness and fracture toughness of ZrB2-SiC composites fabricated by spark plasma sintering. Iranian Journal of Ceramic Science & Engineering. 2018; 6 (4) :41-52
URL: http://ijcse.ir/article-1-555-en.html


Volume 6, Issue 4 (3-2018) Back to browse issues page
نشریه علم و مهندسی سرامیک Iranian Journal of Ceramic Science & Engineering
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