Repositório Digital

A- A A+

Influence of the chemical surface structure on the nanoscale friction in plasma nitrided and post-oxidized ferrous alloy

.

Influence of the chemical surface structure on the nanoscale friction in plasma nitrided and post-oxidized ferrous alloy

Mostrar registro completo

Estatísticas

Título Influence of the chemical surface structure on the nanoscale friction in plasma nitrided and post-oxidized ferrous alloy
Autor Freislebem, Márcia
Menezes, Caren Machado
Bohn, Felipe
Costi, Fernanda Buratti
Ferreira, Patrícia A.
Aguzzoli, Cesar
Baumvol, Israel Jacob Rabin
Alvarez, Fernando
Figueroa, Carlos Alejandro
Abstract Friction is a ubiquitous phenomenon in everyday activities spanning from vehicles where efficient brakes are mandatory up to mechanical devices where its minimum effects are pursued for energy efficiency issues. Recently, theoretical models succeed correlating the friction behavior with energy transference via phonons between sliding surfaces. Therefore, considering that the energy losses by friction are prompted through phonons, the chemical surface structure between sliding surfaces is very important to determine the friction phenomenon. In this work, we address the issue of friction between a conical diamond tip sliding on different functionalized flat steel surfaces by focusing the influence of the chemical bonds in the outermost layers on the sliding resistance. This geometry allows probing the coupling of the sharp tip with terminator species on the top and underneath material surface at in-depth friction measurements from 20 to 200 nm. Experimentally, the friction coefficient decreases when nitrogen atoms are substituted for oxygen in the iron network. This effect is interpreted as due to energy losses through phonons whilst lower vibrational frequency excitation modes imply lower friction coefficients and a more accurate adjustment is obtained when a theoretical model with longitudinal adsorbate vibration is used.
Contido em Applied physics letters. New York. Vol. 105, no. 11 (Sept. 2014), 111603, 4 p.
Assunto Atrito cinético
Endurecimento de superfícies
Freios
Processamento de materiais com plasma
Vibracoes
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/142395
Arquivos Descrição Formato
000964601.pdf (905.6Kb) Texto completo Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.