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The High-Temperature Wear and Oxidation Behavior of CrC-Based HVOF Coatings

Citace:
HOUDKOVÁ, Š., ČESÁNEK, Z., SMAZALOVÁ, E., LUKÁČ, F. The High-Temperature Wear and Oxidation Behavior of CrC-Based HVOF Coatings. JOURNAL OF THERMAL SPRAY TECHNOLOGY, 2018, roč. 27, č. 1-2, s. 179-195. ISSN: 1059-9630
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: The High-Temperature Wear and Oxidation Behavior of CrC-Based HVOF Coatings
Rok vydání: 2018
Autoři: Šárka Houdková , Ing. Zdeněk Česánek Ph.D. , Ing. Eva Smazalová , František Lukáč
Abstrakt CZ: Byly hodnoceny tři komerčně dostupné materiály na bázi CrC s rozdílnou matricí(Cr3C2-25%NiCr; Cr3C2-25%CoNiCrAlY and Cr3C2-50%NiCrMoNb), deponované pomocí technologie HVOF. Byla sledována jejich odolnost proti působení vyské teploty v různých typech prostředí - v horkém vzduchu a horké tlakové páře. Ukázalo se, že povlak Cr3C2-50%NiCrMoNb je vhodnou náhradou povlaku Cr3C2-25%NiC, který v prostředí horké tlakové páry podléhá preferenční oxidaci karbidických částic.
Abstrakt EN: Three commercially available chromium carbide-based powders with different kinds of matrix (Cr3C2-25%NiCr; Cr3C2-25%CoNiCrAlY and Cr3C2-50%NiCrMoNb) were deposited by an HVOF JP-5000 spraying gun, evaluated and compared. The influence of heat treatment on the microstructure and properties, as well as the oxidation resistance in a hot steam environment (p=24 MPa; T=609°C) were evaluated by SEM and XRD with respect to their potential application in the steam power industry. The sliding wear resistance measured at room and elevated (T=600°C) temperatures according to ASTM G-133. For all three kinds of chromium carbide-based coatings the precipitation of secondary carbides from the supersaturated matrix was observed during the heat treatment. For Cr3C2-25%NiCr coating annealed in hot steam environment as well as for Cr3C2-25%CoNiCrAlY coating in both environment, the inner carbide oxidation was recorded. The sliding wear resistance was found equal at room temperature, regardless of the matrix composition and content, while at elevated temperatures, the higher wear was measured, varying in dependence on the matrix composition and content. The chromium carbide-based coating with modified matrix composition Cr3C2-50%NiCrMoNb is suitable to replace the Cr3C2-25%NiCr coating in a hot steam environment to eliminate the risk of failure caused by inner carbide oxidation
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