Role of Si3N4 on microstructure and hardness of hot-pressed ZrB2−SiC composites

  • Zahra Bahararjmand Department of Biophysics, Istanbul University-Cerrahpasa, Istanbul, Turkey
  • Mohammad A. Khalilzadeh Department of Forest Biomaterials, College of Natural Resources, North Carolina State University, Raleigh, North Carolina, 27695-8005, United States
  • Farshad Saberi-Movahed Department of Materials Science and Engineering٫ North Carolina State University, Raleigh, North Carolina, 27695-8005, United States
  • Tae Hyung Lee Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea
  • Jinghan Wang Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea
  • Sea-hoon Lee Division of Powder/Ceramics Research, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea
  • Ho Won Jang Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea

Abstract

The impact of Si3N4 content on the hardness and microstructural developments of ZrB2-SiC material has been investigated thoroughly in the present investigation. Having prepared the raw materials in a jar mill, the ZrB2-SiC samples containing various amounts of Si3N4 were hot-pressed at 1850 °C. Furthermore, XRD, FESEM, and HRTEM were utilized to evaluate the microstructure of samples. The formation of in-situ h-BN was proved by the mentioned methods. Also, it was shown that the Vickers hardness of ZrB2-SiC increases up to 20 GPa in presence of 4.5 wt% Si3N4 which is 3 GPa more than the sample without Si3N4. Results show that the positive effect of increased relative density on hardness is more than the negative effect of h-BN soft phase formation.

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Keywords: Hot-pressing, ZrB2-SiC-Si3N4, Microstructure, Hardness
Role of Si3N4 on microstructure and hardness of hot-pressed ZrB2−SiC composites
Submitted
2021-03-15
Published
2021-04-10
How to Cite
Bahararjmand, Z., Khalilzadeh, M. A., Saberi-Movahed, F., Lee, T. H., Wang, J., Lee, S.- hoon, & Jang, H. W. (2021). Role of Si3N4 on microstructure and hardness of hot-pressed ZrB2−SiC composites. Synthesis and Sintering, 1(1), 34-40. https://doi.org/10.53063/synsint.2021.1113
Section
Articles