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This paper describes the detailed high-temperature properties of monophasic Al3BC3, including
the thermal expansion characteristics of its crystal structure and thermal shock resistance.
We examined the differences in physical properties between Al3BC3 and Al8B4C7, which was
previously thought to be Al3BC3. Compared with the thermal conductivity and CTE of Al3BC3
measured in the present study, those reported for Al8B4C7 in a previous study were higher,
which is attributable to residues of Al and B. The densification of Al8B4C7 is supported by gasphase
diffusion via Al- and B-based gases or liquid, whereas the sintering of Al3BC3 is dominated
by solid-phase diffusion. The bending strength of Al3BC3 was 226 MPa at RT and was
maintained even at high temperatures. Al3BC3 was found to exhibit a good thermal shock
fracture resistance parameter R’ of 3.3, equivalent to that of Al2O3 and substantially better than
that of commonly used engineering ceramics Al4SiC4 and Al6Si2O13, mainly because of the
higher thermal conductivity and lower elastic modulus of Al3BC3. The dense Al3BC3 sample
exhibited excellent thermal stability under N2 and inert gas atmospheres but was easily
oxidized to monophasic Al2O3 at 1300°C under ambient air.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Al3BC3

Date published: 2026-01-02

Publisher: Informa UK Limited

Journal:

• Journal of Asian Ceramic Societies (ISSN: 21870764) vol. 14 issue. 1

Funding:

• The Technical Association of Refractories, Japan

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/21870764.2025.2595816

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Updated at: 2026-03-04 16:30:03 +0900

Published on MDR: 2026-03-04 12:42:21 +0900