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Recubrimientos nanoestructurados de circonia estabilzada con itria (ysz) depositados mediante técnicas de termorrociado por plasma en suspensión

Conférence invitée
Author
STAIA, Mariana
89498 Universidad Central de Venezuela [UCV]
211915 Mechanics surfaces and materials processing [MSMP]
89498 Universidad Central de Venezuela [UCV]
211915 Mechanics surfaces and materials processing [MSMP]
KOSSMAN, Stephania
1252 Laboratoire de Mécanique de Lille - FRE 3723 [LML]
89498 Universidad Central de Venezuela [UCV]
CONTREPAS, V
CHICOT, Didier
1252 Laboratoire de Mécanique de Lille - FRE 3723 [LML]
IOST, Alain
211915 Mechanics surfaces and materials processing [MSMP]
VAN GORP, Adrien
211915 Mechanics surfaces and materials processing [MSMP]

URI
http://hdl.handle.net/10985/11956
Date
2017

Abstract

Las propiedades de los recubrimientos a base de circonia estabilizada con ytria (YSZ) les confieren un excelente desempeño como barreras térmicas (TBC). En el presente trabajo, recubrimientos de 8YSZ fueron depositados sobre Haynes 230 mediante el proceso de termorrociado por plasma por suspensión (SPS) con el fin de servir de enlace (subcapa) entre el sustrato y un recubrimiento más grueso de YSZ, depositado por termorrociado por plasma atmosférico (APS). Se estudió el efecto del espesor de la subcapa depositada por SPS y la influencia de los tratamientos térmicos posteriores (TT) a 300°C y 600°C sobre su desempeño tribológico a temperatura ambiente (Tamb) y 650°C, respectivamente. Durante los ensayos de desgaste deslizante con una carga de 2 N contra alúmina, se determinó que la reducción del espesor del recubrimiento de 75 μm a 25 μm incrementa la resistencia al desgaste aproximadamente 5 veces. Asimismo, para el espesor de 25 μm el TT a la temperatura de 600°C disminuye 6 veces su resistencia al desgaste con respecto a la condición original del recubrimiento. Similarmente, cuando el ensayo se realizó a 650°C, el comportamiento tribológico desmejoró significativamente. Los resultados han sido relacionados con los cambios morfológicos que tienen lugar durante el calentamiento.

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