High-temperature strength of boron carbide with Pt grain-boundary framework in situ synthesized during spark plasma sintering

O. Vasylkiv, D. Demirskyi, H. Borodianska, A. Kuncser, P. Badica

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Grain boundaries, twins, and defects are considered to influence the thermomechanical behavior of any covalent ceramic, as a result, monolithic B4C samples show different curve shapes of bending strength vs temperature and the present theoretical models fail to fit them over the entire temperature range. To overcome these issues, we fabricated a novel high-density boron carbide and evaluated its high-temperature bending strength. The as-obtained ceramic is composed of boron carbide grains and a fine grain-boundary metal Pt framework. The material shows a decreased strength, which is due to a non-linear increase in the volume expansion coefficient of the B4C. Recovery in strength above 1000 °C is due to the presence of twins, their growth and rearrangements. We consider twins rearrangements are the pieces of evidence for a novel ‘micro’ mechanism of high-temperature stress accommodation for the boron carbide bulks.

本文言語English
ページ(範囲)9136-9144
ページ数9
ジャーナルCeramics International
46
7
DOI
出版ステータスPublished - 2020 5月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • プロセス化学およびプロセス工学
  • 表面、皮膜および薄膜
  • 材料化学

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