Influence of topography on the running-in of water-lubricated silicon carbide journal bearings

Andersson, Peter; Juhanko, Jari; Nikkilä, A.-P.; Lintula, Pekka

doi:10.1016/s0043-1648(95)06815-5

Cited by 31 publications

(13 citation statements)

References 4 publications

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“…Andersson et al [7] assumed that the sliding surfaces tested in a lubricated environment become polished during running-in, they also observed that the lubrication mechanism was transformed from boundary or mixed lubrication to full film lubrication.…”

Section: State Of the Artmentioning

confidence: 99%

An experimental model for mixed friction during running-in

Nogueira

Dias

Gras

et al. 2002

Wear

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Mechanical engineering often uses fluid lubrication to limit friction. Even in the presence of a lubricant, metallic contact between the sliding surfaces may readily occur. In running-in, the oil film thickness can be so thin that contact arises at the summit of asperities, thus, increasing both the friction coefficient and wear. Such regimes are the so-called mixed or boundary lubrication. In these situations, the friction coefficient varies continuously and it is therefore, necessary to calculate the friction coefficient at any given moment.Given two rough parallel surfaces in a lubricated environment, a model is herein proposed whereby the friction coefficient is controlled by a single hydrodynamic parameter. This experimental analysis seeks to take into account a wide variety of factors influencing the conditions in which the contact operates: functional parameters (normal load, sliding speed, viscosity), the contact pair's mechanical properties (elastic modulus, Poisson's ratio) and surface microgeometry (as expressed by the standardised roughness parameters). This extended friction model predicts tribological behaviour in lubrication regimes: thus, by judicious choice of materials (according to the most appropriate mechanical properties and surface roughness) one can reduce the running-in period. To confirm the model, different material pairs have been tested. The tests have been conducted using a pin on disc apparatus in a 100 Neutral solvent (100 NS) oil at 20 • C. Experimental results totally confirmed the model.

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Section: State Of the Artmentioning

confidence: 99%

An experimental model for mixed friction during running-in

Nogueira

Dias

Gras

et al. 2002

Wear

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“…Some of them are connected with ceramic bearings, which are not used in marine industry (Andersson and Lintula (5); Andersson, et al (6)). Most of the papers connected with the influence of surfaces structure on bearing properties are only theoretical studies (Tturage, et al …”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Roughness Topography on Properties of Water-Lubricated Polymer Bearings: Experimental Research

Litwin

2011

Tribology Transactions

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Surface smoothness of journal and bushing has significant influence on properties of sliding bearings. Relevant literature contains a number of theoretical works connected with the subject of surface roughness pattern and height. Calculations based on various models indicate that the structure of sliding surface influences bearing's hydrodynamic properties. One of the main conclusions is that roughness transversal to the sliding direction can increase hydrodynamic capacity of a bearing (H. Christensen and K.

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“…5. Coefficient of friction (COF) values are average values from each test step for the duration of 15 s [11]. At both room temperature and 95°C, COF decreases for all test materials when the rotational speed increases.…”

Section: Effect Of Rotational Speed On Frictionmentioning

confidence: 99%

Friction and wear characteristics of different Pb-free bearing materials in mixed and boundary lubrication regimes

Gebretsadik

Hardell

Prakash

2015

Wear

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a b s t r a c tTraditional bearing materials contain different amounts of lead (Pb) because of its friction reducing properties. However, in view of the negative health and environmental impact of Pb, there is growing emphasis on restricting the usage of Pb in engine bearings. Owing to this, new bearing materials that provide at least comparable tribological performance to that of Pb containing alloys are being developed and some new Pb-free materials are being already used in engine bearing applications. It is, however, still unclear how these new engine bearing materials would perform in mixed and boundary lubricated conditions. In this study, a block-on-ring test setup was employed to investigate the tribological performance of several bi-metal and multi-layer Pb-free bearing materials with different compositions of bearing lining and overlay plating. Pb-containing bearing material was also studied as a reference material. Friction and wear properties of these bearing materials were investigated and their wear mechanisms under lubricated conditions have been analysed. Bearing material with Polyamide-Imide based overlay containing graphite and MoS 2 exhibited better friction and wear properties than Pb-based and Al-Sn based materials. Pb-containing bearing material shows higher wear of material and Al-Sn based material has shown higher friction compared with the other test materials.

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Influence of topography on the running-in of water-lubricated silicon carbide journal bearings

Cited by 31 publications

References 4 publications

An experimental model for mixed friction during running-in

An experimental model for mixed friction during running-in

Influence of Surface Roughness Topography on Properties of Water-Lubricated Polymer Bearings: Experimental Research

Friction and wear characteristics of different Pb-free bearing materials in mixed and boundary lubrication regimes

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