Zening Xu

Publications (2)3.29 Total impact

• Article: Preparation of MWNTs/Al2O3 composites and their mechanical and electrical properties

  Jinpeng Fan, Daqing Zhao, Zening Xu, Minsheng Wu
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  ABSTRACT: The mechanical and electrical properties of MWNTs/Al2O3 composite prepared fabricated by hot pressing are investigated. The relation between properties and microstructure of composites The mechanical and electrical properties of MWNTs/Al2O3 composite prepared fabricated by hot pressing are investigated. The relation between properties and microstructure of composites is also discussed. With 4wt% MWNTs as reinforcement, the fracture toughness of composite obtained reaches 5.55 MPa·m1/2, which is 80% higher than that of pure Al2O3 obtained in the same conditions. The main toughening mechanism is CNTs’ pinning alumina grain boundaries, and the pullout is also discussed. With 4wt% MWNTs as reinforcement, the fracture toughness of composite obtained reaches 5.55 MPa·m1/2, which is 80% higher than that of pure Al2O3 obtained in the same conditions. The main toughening mechanism is CNTs’ pinning alumina grain boundaries, and the pullout of CNTs takes effect also. Through adding 2wt% MWNTs and altering the mix method, the fracture toughness of the composite of CNTs takes effect also. Through adding 2wt% MWNTs and altering the mix method, the fracture toughness of the composite obtained is 3.97 MPa·m1/2. Furthermore, the electrical resistivity is as low as 8.4×10−3 Ω·m, decreasing by 14 orders of magnitude compared with pure alumina ceramics. The function of CNTs in composite is related obtained is 3.97 MPa·m1/2. Furthermore, the electrical resistivity is as low as 8.4×10−3 Ω·m, decreasing by 14 orders of magnitude compared with pure alumina ceramics. The function of CNTs in composite is related to the distribution state of CNTs in composite, and the distribution state of CNTs in matrix is dependent on preparation procedures. to the distribution state of CNTs in composite, and the distribution state of CNTs in matrix is dependent on preparation procedures. KeywordsMWNTs-alumina-composite-fracture toughness-electrical properties KeywordsMWNTs-alumina-composite-fracture toughness-electrical properties
  Science in China Series E Technological Sciences 04/2012; 48(6):622-631. · 1.02 Impact Factor
• Article: Preparation and Microstructure of Multi‐Wall Carbon Nanotubes‐Toughened Al2O3 Composite

  Jinpeng Fan, Daqing Zhao, Minsheng Wu, Zening Xu, Jun Song
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  ABSTRACT: With multi-wall carbon nanotubes (MWNTs) as reinforcement, a 12 vol% MWNTs/alumina (Al2O3) ceramic composite was obtained by hot pressing. A fracture toughness of 5.55±0.26 MPa·m1/2, 1.8 times that of pure Al2O3 ceramics, was achieved. Experimental results showed that the enveloping of carbon nanotubes (CNTs) with sodium dodecyl sulfate (SDS) is effective in changing the hydrophobicity of CNTs to hydrophilicity and improving the dispersion of CNTs in aqueous solution. Enveloped with SDS, CNTs can be homogeneously mixed with Al2O3 at a microscopic level by heterocoagulation. This mixing method can obviously improve the chemical compatibility between CNTs and Al2O3, which is important for enhancement of interfacial strength between them.
  Journal of the American Ceramic Society 12/2005; 89(2):750 - 753. · 2.27 Impact Factor