Tecnologia em Metalurgia, Materiais e Mineração
https://www.tecnologiammm.com.br/article/doi/10.4322/tmm.2012.013
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

TRIBOCAMADA FORMADA EM REVESTIMENTOS MULTIFUNCIONAIS: INFLUÊNCIA DO AMBIENTE

TRIBOLAYER FORMED ON MULTIFUNCTIONAL COATINGS: INFLUENCE OF THE ENVIRONMENT

Mello, José Daniel Biasoli; Binder, Roberto

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Resumo

Na maioria dos contatos tribológicos uma tribo camada se forma entre as superfícies em movimento relativo. O ambiente tem um papel crucial na cinética de formação desta tribocamada e, desta forma, afeta significativamente atrito e desgaste. O presente trabalho apresenta o efeito de alguns gases no comportamento tribológico de revestimentos multifuncionais. Os revestimentos foram ensaiados em um tribômetro alternativo operando em altas pressões de câmara. Foram avaliados o coeficiente de atrito, os mecanismos de desgaste e a taxa de desgaste do corpo e contra‑corpo. Tanto o coeficiente de atrito quanto as taxas de desgaste do corpo (revestimento multifuncional SiDLC+NCr) e contra‑corpo (aço 52100) são afetados pela atmosfera presente na câmara de ensaio (ar, CO2 e R600a) . Espectros Raman das tribocamadas apresentam dois picos típicos de DLC (Bandas G e D) bem como bandas de baixa intensidade para baixas frequências características de óxidos à base de ferro produzidos pela reação do contra-corpo com o ambiente. A presença de uma intensa banda grafítica (G) aparentemente induz o melhor desempenho tribológico do sistema operando em ambiente R600a.

Palavras-chave

Revestimentos, Comportamento tribológico, Meio ambiente

Abstract

Friction and wear control can be achieved primarily by considering the nature of the counter faces, together with the environmental conditions. In most cases, a transfer film is found on the sliding surfaces. Environment plays a crucial role on the kinetics of formation and on the composition of the transfer film, and thus strongly influences friction levels and wear rates. In this paper, the effect of the actual environment (refrigerant) present in hermetic compressors on the tribological behaviour of a Si rich multifunctional DLC coating deposited on 1020 steel is analyzed. Unlubricated reciprocating pin-on- disk tests are performed using a High Pressure Tribometer under different atmospheres (Air, CO2 and R600a). Samples tested in R600a environment present the lowest friction coefficient and the lowest wear rate for both body and counter-body.

Keywords

Coatings, Tribological behaviour, Environment

Referências

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