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. 2021 Feb 26;14(5):1100. doi: 10.3390/ma14051100

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Relative density of B₄C ceramics (sintered at 1950 °C) as a function of holding time; (b) Hardness and fracture toughness of B₄C ceramics as a function of holding time.