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In this study we explored the densification, microstructure evolution, and high-temperature properties of bulk lanthanum hexaboride. LaB6 bulks were consolidated using spark-plasma sintering only in the temperature range between 1400◦C and 1700◦C.We adopted flash spark plasma sintering (SPS) of LaB6 using a direct current heating without a graphite die.We observed a peculiar grain-size gradient when coarse grains exceeding 300 μm were observed on the top side of the specimen, while the bottom side had a grain size of 15–20 μm. Such large grain was not observed using SPS at 2000◦C, suggesting that these might originate
from a local overheating. Based on the three-point flexural tests, it was observed that the toughness and strength of the LaB6 were acceptable at room-temperature (3.1 ± 0.2 MPa m1/2, 300 ± 20 MPa). However, at 1600◦C, these parameters would decrease to 1.3 ± 0.1 MPa m1/2 and 120 ± 40 MPa, respectively.

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• In Copyright
  

Keyword: grain growth, densification, borides, spark plasma sintering

Date published: 2022-01-29

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 15512916) vol. 105 issue. 6 p. 4277-4290

Funding:

• NIMS PA3030 (粉体・セラミックス 結晶・界面の階層的構造制御による機能顕在化のための研究 70)
• NIMS PA5180 (セラミックスプロセッシング - 30 )

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4977

First published URL: https://doi.org/10.1111/jace.18331

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Updated at: 2024-11-21 16:35:03 +0900

Published on MDR: 2024-11-21 16:35:03 +0900