High-Strength B4C–TaB2 Eutectic Composites Obtained via In Situ by Spark Plasma Sintering

Dmytro Demirskyi, Yoshio Sakka, Oleg Vasylkiv

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The in situ synthesis/consolidation of B4C–TaB2 eutectic composites by spark plasma sintering (SPS) is reported. Samples for the evaluation of bending strength were cut from specimens with diameters of 30 mm. The sample prepared for the three-point flexural strength test had fibers of tantalum diboride with diameter of 1.3 ± 0.4 μm distributed in the B4C matrix, thereby reducing composites brittleness and yielding an indentation fracture toughness of up to 4.5 MPa·m1/2. Furthermore, the Vickers hardness of B4C–TaB2 eutectics formed by SPS was as high as 26 GPa at an indentation load of 9.8 N. The flexural strength of the B4C–TaB2 system has been reported for the first time. Some steps were identified in the load–displacement curve, suggesting that micro- and macrocracking occurred during the flexural test. Ceramic composites with a eutectic structure exhibited a room-temperature strength of 430 ± 25 MPa. Compared with other eutectic composites of boron carbide with transition-metal diborides, room-temperature strength the B4C–TaB2 was 40% higher than that of B4C–TiB2 ceramics, demonstrating advantage of the in situ synthesis/consolidation of eutectic composites by SPS.

Original languageEnglish
Pages (from-to)2436-2441
Number of pages6
JournalJournal of the American Ceramic Society
Volume99
Issue number7
DOIs
Publication statusPublished - 2016 Jul 1
Externally publishedYes

Keywords

  • boron carbide
  • eutectic composite
  • spark plasma sintering
  • strength
  • tantalum diboride

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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