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We report the mechanical behavior of a bulk boron ceramic prepared by spark plasma sintering of commercially-available β-boron powder. In order to fabricate polycrystalline boron ceramic, we used a protective tantalum foil reacted with carbon from the graphite die or graphite foil forming a thin layer of TaB2 and TaC covering the boron specimen. This is the first study to show the high-temperature flexural strength, toughness, and Young's moduli of boron up to 1400°C. At 1600°C and above, boron will react with testing environment forming an outer shell.
The flexural strength and fracture toughness at room temperature reached an average of 340 MPa and 4.1 MPa m1/2, respectively. Despite showing clear signs of plastic deformation on the strain-stress curves, the yield strength of the monolithic boron ceramic exceed 1 GPa at 1200°C. It was determined that fracture at elevated temperatures follows a quasi-transgranular mechanism, where the sub-grains of the boron fracture as plate-like structures. An interpretation for the observed fracture behavior was proposed.

権利情報:

• In Copyright
  

キーワード: boron, polycrystalline ceramic, flexural strength, high-temperature materials

刊行年月日: 2022-01-24

出版者: Elsevier BV

掲載誌:

• Materialia (ISSN: 25891529) vol. 21 101346

研究助成金:

• NIMS PA5180 (セラミックスプロセッシング)

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4970

公開URL: https://doi.org/10.1016/j.mtla.2022.101346

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更新時刻: 2024-11-21 16:31:38 +0900

MDRでの公開時刻: 2024-11-21 16:31:38 +0900