Preparation of polymer-derived Si–B–C–N monoliths by spark plasma sintering technique

Mirna Chaker Bechelany; Chrystelle Salameh; Antoine Viard; Lise Guichaoua; Fabrice Rossignol; Thierry Chartier; Samuel Bernard; Philippe Miele

doi:10.1016/j.jeurceramsoc.2014.11.021

Preparation of polymer-derived Si–B–C–N monoliths by spark plasma sintering technique

Mirna Chaker Bechelany ^{1, 2} Chrystelle Salameh ² Antoine Viard ² Lise Guichaoua ¹ Fabrice Rossignol ¹ Thierry Chartier ¹ Samuel Bernard ^{2, *} Philippe Miele ²

* Auteur correspondant

1 SPCTS-AXE1 - Axe 1 : procédés céramiques

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

2 IEM - Institut Européen des membranes

Abstract : The present paper reports the preparation of sintering additive-free Si–B–C–N monoliths by spark plasma sintering (SPS) under nitrogen of polymer-derived Si–B–C–N powders. Powders are synthesized in nitrogen or ammonia atmosphere to modify their carbon content. The nitrogen-treated powders sintered in the temperature range 1500–1900 °C lead to monoliths with a density increasing from 2.4 to 2.6 g/cm3, Vickers harness and Young's modulus ranging from 0.7 to 5.4 GPa and 48 to 102 GPa, respectively. SiC was the first phase to nucleate around 1700 °C, whereas Si3N4 grew at 1800 °C. At this temperature, monoliths are pure electrical conductor nanocomposites mainly composed of Si3N4 and SiC nanophases embedded in a turbostratic BN(C) matrix. Above 1800 °C, Si3N4 was not identified. In comparison, ammonia-treated powders sintered at 1800 °C represent dense insulator composites mainly composed of Si3N4 and BN with a Vickers hardness as high as 15 GPa and an excellent stability in air.

Keywords : Polymer-derived ceramics (Nano)composites Properties Si–B–C–N Spark plasma sintering

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

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https://hal-unilim.archives-ouvertes.fr/hal-01115389
Contributeur : Fabrice Rossignol <>
Soumis le : mercredi 11 février 2015 - 09:52:59
Dernière modification le : vendredi 28 février 2020 - 13:26:14

Preparation of polymer-derived Si–B–C–N monoliths by spark plasma sintering technique

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Preparation of polymer-derived Si–B–C–N monoliths by spark plasma sintering technique

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