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Une céramique ultraréfractaire, ou céramiq … Une céramique ultraréfractaire, ou céramique ultra-haute température (UHTC), est une céramique réfractaire présentant une très bonne stabilité thermique au-delà de 2 000 °C. De tels matériaux peuvent être utilisés pour les boucliers thermiques protégeant un véhicule spatial lors de sa rentrée atmosphérique, pour les revêtements de pièces soumises à des températures élevées ou comme matériau constitutif de telles pièces. D'une manière générale, les céramiques ultraréfractaires sont des borures, des carbures, des nitrures et des oxydes de métaux de transition des premiers groupes (colonnes du titane, du vanadium, du chrome, voire du manganèse). Les recherches s'intéressent notamment aux borures de métaux de transition plus lourds tels que le diborure d'hafnium HfB2 et le diborure de zirconium ZrB2. D'autres céramiques ultraréfractaires étudiées pour les systèmes de protection thermique lors de la rentrée atmosphérique des engins spatiaux sont par exemple le nitrure d'hafnium HfN, le nitrure de zirconium ZrN, le carbure de titane TiC, le nitrure de titane TiN, le dioxyde de thorium ThO2, le carbure de tantale TaC et leurs composites associés. tantale TaC et leurs composites associés.
, Ultra-high-temperature ceramics (UHTCs) ar … Ultra-high-temperature ceramics (UHTCs) are a class of refractory ceramics that offer excellent stability at temperatures exceeding 2,000 °C being investigated as possible thermal protection system (TPS) materials, coatings for materials subjected to high temperatures, and bulk materials for heating elements. Broadly speaking, UHTCs are borides, carbides, nitrides, and oxides of early transition metals. Current efforts have focused on heavy, early transition metal borides such as hafnium diboride (HfB2) and zirconium diboride (ZrB2); additional UHTCs under investigation for TPS applications include hafnium nitride (HfN), zirconium nitride (ZrN), titanium carbide (TiC), titanium nitride (TiN), thorium dioxide (ThO2), tantalum carbide (TaC) and their associated composites.ide (TaC) and their associated composites.
, Le ceramiche ultra refrattarie o Ultra-hig … Le ceramiche ultra refrattarie o Ultra-high-temperature ceramics (UHTCs) sono una classe di ceramiche refrattarie che offrono un'eccellente stabilità a temperature superiori a 2000 °C studiate come possibili materiali di protezione termica (TPS), rivestimenti per materiali soggetti a temperature elevate e materiali monolitici per elementi riscaldanti. In generale, gli UHTC sono boruri, carburi, nitruri e ossidi dei metalli di transizione dei primi gruppi (III-V). Gli attuali sforzi si sono concentrati su boruri di metalli di transizione pesanti come il diboruro di afnio (HfB2) e il diboruro di zirconio (ZrB2); ulteriori UHTC studiati per applicazioni come TPS includono (HfN), nitruro di zirconio (ZrN), carburo di titanio (TiC), nitruro di titanio (TiN), diossido di torio (ThO2), carburo di tantalio (TaC) e loro compositi associati.tantalio (TaC) e loro compositi associati.
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| rdfs:comment |
Le ceramiche ultra refrattarie o Ultra-hig … Le ceramiche ultra refrattarie o Ultra-high-temperature ceramics (UHTCs) sono una classe di ceramiche refrattarie che offrono un'eccellente stabilità a temperature superiori a 2000 °C studiate come possibili materiali di protezione termica (TPS), rivestimenti per materiali soggetti a temperature elevate e materiali monolitici per elementi riscaldanti. In generale, gli UHTC sono boruri, carburi, nitruri e ossidi dei metalli di transizione dei primi gruppi (III-V). Gli attuali sforzi si sono concentrati su boruri di metalli di transizione pesanti come il diboruro di afnio (HfB2) e il diboruro di zirconio (ZrB2); ulteriori UHTC studiati per applicazioni come TPS includono (HfN), nitruro di zirconio (ZrN), carburo di titanio (TiC), nitruro di titanio (TiN), diossido di torio (ThO2), carburo d(TiN), diossido di torio (ThO2), carburo d
, Ultra-high-temperature ceramics (UHTCs) ar … Ultra-high-temperature ceramics (UHTCs) are a class of refractory ceramics that offer excellent stability at temperatures exceeding 2,000 °C being investigated as possible thermal protection system (TPS) materials, coatings for materials subjected to high temperatures, and bulk materials for heating elements. Broadly speaking, UHTCs are borides, carbides, nitrides, and oxides of early transition metals. Current efforts have focused on heavy, early transition metal borides such as hafnium diboride (HfB2) and zirconium diboride (ZrB2); additional UHTCs under investigation for TPS applications include hafnium nitride (HfN), zirconium nitride (ZrN), titanium carbide (TiC), titanium nitride (TiN), thorium dioxide (ThO2), tantalum carbide (TaC) and their associated composites.ide (TaC) and their associated composites.
, Une céramique ultraréfractaire, ou céramiq … Une céramique ultraréfractaire, ou céramique ultra-haute température (UHTC), est une céramique réfractaire présentant une très bonne stabilité thermique au-delà de 2 000 °C. De tels matériaux peuvent être utilisés pour les boucliers thermiques protégeant un véhicule spatial lors de sa rentrée atmosphérique, pour les revêtements de pièces soumises à des températures élevées ou comme matériau constitutif de telles pièces. D'une manière générale, les céramiques ultraréfractaires sont des borures, des carbures, des nitrures et des oxydes de métaux de transition des premiers groupes (colonnes du titane, du vanadium, du chrome, voire du manganèse). Les recherches s'intéressent notamment aux borures de métaux de transition plus lourds tels que le diborure d'hafnium HfB2 et le diborure de zirconiu d'hafnium HfB2 et le diborure de zirconiu
|
| rdfs:label |
Ceramiche ultra refrattarie
, Céramique ultraréfractaire
, Ultra-high-temperature ceramics
|
