Lipophilic magnetite nanoparticles coated with stearic acid: A potential agent for friction and wear reduction

Autor(es)

Zuin, Andre ; Cousseau, Tiago ; Sinatora, Amilton ; Toma, Sergio Hiroshi ; Araki, Koiti ; Toma, Henrique Eisi

• Tipo de documento: Artigo Científico
• Fonte: TRIBOLOGY INTERNATIONAL; v. 112, p. 10-19, AUG 2017.
• Citações Web of Science: 8

Resumo

Lipophilic magnetite nanoparticles (MagNP; d approximate to 10 nm) functionalized with stearic acid were synthetized and tested as additive in polyalphaolefin synthetic base oil (PAO8) in a model system. The thermal properties of the starting base oil and of the base oil mixed with nanoparticles were evaluated using TG/DTA under inert and oxidizing atmosphere. The frictional response of the lubricants was evaluated under a broad range of operating conditions at the boundary lubrication regime using a 10 mm AISI 52,100 bearing steel ball against the flat face of an AISI H13 steel disc. The results showed that: i) MagNP improved the thermal stability of the base oil; ii) reduced the friction values, mostly during load step transition; iii) reduced significantly the wear marks. (AU)

• Processo FAPESP: 09/54891-8 - Desafios tribológicos em motores flex-fuel
• Beneficiário: Roberto Martins de Souza
• Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - PITE
• Processo FAPESP: 13/19145-9 - Efeito da adição de nanopartículas de magnetita sobre o atrito e o desgaste em ensaios lubrificados que simulam o sistema anel-cilindro de motores do tipo flex-fuel
• Beneficiário: Andre Zuin
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado