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    • Keywords


      Talc; clay; pressureless sintering; porous Si3N4; mechanical properties; Weibull distribution.

    • Abstract


      Porous Si3N4 ceramics were successfully synthesized using cheaper talc and clay as sintering additives by pressureless sintering technology and the microstructure and mechanical properties of the ceramics were also investigated. The results indicated that the ceramics consisted of elongated 𝛽-Si3N4 and small Si2N2O grains. Fibrous 𝛽-Si3N4 grains developed in the porous microstructure, and the grain morphology and size were affected by different sintering conditions. Adding 20% talc and clay sintered at 1700°C for 2 h, the porous Si3N4 ceramics were obtained with excellent properties. The final mechanical properties of the Si3N4 ceramics were as follows: porosity, 𝑃0 = 45.39%; density, ρ = 1.663.g.cm-3; flexural strength, 𝜎b (average) = 131.59 MPa; Weibull modulus, 𝑚 = 16.20.

    • Author Affiliations


      Yu Fangli1 Yang Jianfeng1 Xue Yaohui2 Du Jun3 Lu Yuan1 Gao Jiqiang1

      1. State Key Laboratory for Mechanical Behaviour of Materials, Xi’an Jiaotong University, Xi'an 710049, P.R. China
      2. The School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
      3. National Key Laboratory of Remanufacture, No. 21, DuJiaKan, ChangXinDian, Beijing 100072, P.R. China
    • Dates

  • Bulletin of Materials Science | News

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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

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