Effects of TiB2 on Microstructure and Mechanical Properties of Pressure-less-sintered B4C-TiB2 Composites

Zongjia Li, Huanwu Cheng*, Yangwei Wang, Yu Zhu, Rui An, Haiyan Fang, Feiya Aili

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Boron carbide matrix composites containing boron carbide (B4C), titanium diboride (TiB2) at 20%(mass fraction) and 30%, and titanium carbide (TiC) were fabricated at 2130℃using a pressure-less sintering method. Different amounts of TiB2 and TiC particles were added to B4C. TiB2 content was chosen as the main variable to study the effect on the composites. The density, hardness, bending strengths and fracture toughness measurements were performed to obtain the physical and mechanical properties of the samples. The results indicate that by adding 30%TiB2 sub-micron particles at 2130℃, the bending strength and fracture toughness of 277.6MPa and 5.38MPa•m1/2 were obtained for the composite. Particle pullout and crack micro-bridging play an effective role in toughening the composite ceramics. The main toughening mechanisms of the B4C-TiB2 composites are noted to possess microcrack and crack deflection toughening owing to the residual stresses resulting from the mismatch of the thermal expansion coefficient between TiB2 and B4C.

Translated title of the contributionTiB2对无压烧结B4C-TiB2复相陶瓷结构和性能的影响
Original languageEnglish
Pages (from-to)461-468
Number of pages8
JournalKuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society
Volume49
Issue number3
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Boron carbide-titanium diboride composites
  • Mechanical properties
  • Microstructure
  • Pressure-less sintering

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Li, Z., Cheng, H., Wang, Y., Zhu, Y., An, R., Fang, H., & Aili, F. (2021). Effects of TiB2 on Microstructure and Mechanical Properties of Pressure-less-sintered B4C-TiB2 Composites. Kuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society, 49(3), 461-468. https://doi.org/10.14062/j.issn.0454-5648.20200461