On the role of copper in brake friction materials

Österle, Werner; Prietzel, Claudia; Kloß, H.; Дмитриев, А. И.

doi:10.1016/j.triboint.2010.08.005

Cited by 144 publications

(83 citation statements)

References 27 publications

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“…Cu-Fe-based powder metallurgy (P/M) friction materials are now widely used in vehicle brake pads and industrial clutches because of their stable coefficient of friction (COF), good heat resistance, and high strength [1][2][3][4][5]. MoS 2 is one of the most commonly used solid lubricants for Cu-Fe-based friction materials; it can be used to stabilize friction and improve the wear resistance of composites [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Solid FeS lubricant: a possible alternative to MoS2 for Cu–Fe-based friction materials

Peng

Yan

Zhan

et al. 2017

Int J Miner Metall Mater

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Molybdenum disulfide (MoS 2 ) is one of the most commonly used solid lubricants for Cu-Fe-based friction materials. Nevertheless, MoS 2 reacts with metal matrices to produce metal sulfides (e.g., FeS) and Mo during sintering, and the lubricity of the composite may be related to the generation of FeS. Herein, the use of FeS as an alternative to MoS 2 for producing Cu-Fe-based friction materials was investigated. According to the reaction principle of thermodynamics, two composites-one with MoS 2 (Fe-Cu-MoS 2 sample) and the other with FeS (FeS-Cu 2 S-Cu-Fe-Mo sample), were prepared and their friction behaviors and mechanical properties were compared. The results showed that MoS 2 reacted with the Cu-Fe matrix to produce FeS, metallic ternary sulfides, and Mo when sintered at 1050°C. The MoS 2 -Cu-Fe and FeS-Cu 2 S-Cu-Fe-Mo samples thereby exhibited similar characteristics with respect to phase composition, density, hardness, and tribological behaviors. Micrographs of the worn surfaces revealed that the stable friction regime for both composites stemmed from the iron sulfides friction layers rather than from the molybdenum sulfides layers.

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Section: Introductionmentioning

confidence: 99%

Solid FeS lubricant: a possible alternative to MoS2 for Cu–Fe-based friction materials

Peng

Yan

Zhan

et al. 2017

Int J Miner Metall Mater

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“…The higher electrical and thermal conductivity along with low friction makes copper suitable for use in applications such as MEMS switches (Barriga et al 2007) or as an additive to enhance the ''wear mending'' property of a lubricant (Liu et al 2004). Besides its application in MEMS, copper is also the nano-material of choice to be incorporated in the friction material used in automotive brake pads for its ductility and high thermal conductivity (Osterle et al 2010). Copper nanoparticles have been used as an additive to enhance the tribological properties of lubricants (Tarasov et al 2002;Choi et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Molecular scale analysis of dry sliding copper asperities

2014

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A fundamental characterization of friction requires an accurate understanding of how the surfaces in contact interact at the nano or atomic scales. In this work, molecular dynamics simulations are used to study friction and deformation in the dry sliding interaction of two hemispherical asperities. The material simulated is copper and the atomic interactions are defined by the embedded atom method potential. The effect of interference, d, relative sliding velocity, v, asperity size, R, lattice orientation, h, and temperature control, on the friction characteristics are investigated. Extensive plastic deformation and material transfer between the asperities were observed. The sliding process was dominated by adhesion and resulted in high effective friction coefficient values. The friction force and the effective friction coefficient increased with the interference and asperity size but showed no significant change with an increase in the sliding velocity or with temperature control. The friction characteristics varied strongly with the lattice orientation and an average effective friction coefficient was calculated that compared quantitatively with existing measurements.

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“…Seu uso nas pastilhas de freio é justificado por sua excelente condutividade térmica, assim como sua capacidade de provir um deslizamento mais suave reduzindo a propensão de geração de ruído em altas temperaturas (DENIER VAN DER GON et al, 2007;ÖSTERLE et al, 2010).…”

Section: Sistema De Freio a Discounclassified

“…A alta dureza necessária para essa função é produzida por deformação a frio. A deformação plástica posterior na superfície tribológica produz uma microestrutura mais fina na camada atritada, que também resulta em alta dureza quando testada em temperatura ambiente (ÖSTERLE et al, 2010).…”

Section: Sistema De Freio a Discounclassified

“…O conhecimento tribológico chegou muito longe baseado nesses estudos pós-fenômeno (ERIKSSON et al, 2001, tradução nossa CHO et al, 2003, OSTERMEYER, 2003, KATO et al, 2003, ÖSTERLE et. al 2004, 2006, 2010, 2011, 2012, HINRICHS et al 2011, KUKUTSCHOVÁ et al, 2009, 2010, WAHLSTRÖM, 2011, DMITRIEV et al, 2008, 2010, não são raras as inferências à formação de uma dita camada protetora oxidada sem de fato observá-la ou mostrá-la. Em trabalho do próprio Kato (2003), a transição do regime severo para o moderado com a adição de partículas óxidas ou metálicas é atribuída à formação de uma camada de transferência sem mostrá-la, utilizando-se da citação dos resultados de Jiang et al (1998) Figura 7 Apresentação esquemática dos resultados obtidos na investigação do corte transversal na interface pastilha/disco.…”

On the role of copper in brake friction materials

Cited by 144 publications

References 27 publications

Solid FeS lubricant: a possible alternative to MoS2 for Cu–Fe-based friction materials

Solid FeS lubricant: a possible alternative to MoS2 for Cu–Fe-based friction materials

Molecular scale analysis of dry sliding copper asperities

Efeito do cobre como adição interfacial no sistema tribológico pino X disco.

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