Wear performance of oil lubricated silicon nitride sliding against various bearing steels

Wang, L; Wood, R.J.K.; Harvey, Terry J.; Morris, Steven; Powrie, H.E.G.; Care, I.

doi:10.1016/s0043-1648(03)00045-0

Cited by 68 publications

(37 citation statements)

References 20 publications

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“…The AE sensor, a wide-band (100 kHz-1 MHz) accelerometer from the Physical Acoustic Corporation (PAC), was attached to the ball holder to monitor emissions from wear of the ball or metal-metal tribo-contact. Details of the rig, the sensors and the data acquisition procedure can be found from previous publications [15,26]. Raw AE waveforms were captured during the test to enable the analysis in both time and frequency domains.…”

Section: Methodsmentioning

confidence: 99%

The influence of contact conditions on surface reaction layers formed between steel surfaces lubricated by an aviation oil

Wang

Wood

2007

Tribology International

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This study focuses on the influence of load and temperature on the formation and stability of tribo-films for bearing steel on bearing steel contacts lubricated with an aviation oil, EXXON Turbo 2380 (TCP based -tricresyl phosphate) at ambient temperatures. Experiments were carried out on a pin-on-disc (POD) tribometer (with a ball-on-flat geometry) under an average loading rate of 0.17 N s À1 and sliding speed of 3 m s À1. The X-ray photoelectron spectroscopy (XPS) analysis on the worn surfaces of ball and disc shows that a tribo-film forms on both surfaces at room temperature. The formation and removal of the tribo-film are faster on the ball due to the nature of contact between the ball and disc. It was found that the tribo-films formed at room temperature are vulnerable to initial disc temperature. The higher the initial temperature the higher the load carrying capacity. The tribo-film growth and contact deterioration have been monitored by acoustic emission (AE) and electrostatic charge (ESP) sensing systems in real time. The results show that both AE and ESP can detect the tribo-film and contact breakdown and have great potential for on-line condition monitoring of lubricated tribo-contacts. r

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Section: Methodsmentioning

confidence: 99%

The influence of contact conditions on surface reaction layers formed between steel surfaces lubricated by an aviation oil

Wang

Wood

2007

Tribology International

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“…1 Elemental composition of the typical diesel particulate matter by mass [5] such as nitrogen oxides, and sulphur-containing compounds [15]. Previous studies at Southampton have shown that electrostatic sensing can successfully detect wear debris [16], measure tribocharging [17,18], detect surface transformation [19,20], ceramic wear [21][22][23], and changes in oil chemistry and surface tribofilm [24][25][26][27] due to contact potential effect (surface charge) effects; details of this are shown in references [18], [19], and [28]. Debris monitoring of steel wear debris shows the magnitude of charge level was related to the total wear volume [19].…”

Section: Introductionmentioning

confidence: 99%

The effects of diesel contaminants on tribological performance on sliding steel on steel contacts

Ramkumar

Harvey

Wood

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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This article presents the findings from a parametric study examining the effect of four contaminants (soot, oxidation, moisture, and sulphuric acid) at varying levels (four for each). It was observed that all contaminants and contaminant levels reduce the conductivity of the oil. Oxidation and soot contaminants produced large increases in viscosity. The wear rate was mainly influenced by acid and soot additions, while the coefficient of friction was increased by all contaminants and contaminant levels. The steady-state charge levels changed for some contaminants. The best correlation of steady-state charge with the other measured tribological parameters of wear rate, friction, and temperature is seen for the series of oxidized oils. The multi-contaminated oil (L4 Â 4) shows remarkably little degradation in tribological performance.Analysis of the wear mechanisms shows that soot and oxidation produced abrasion and polishing wear, respectively, while sulphuric acid and moisture produced corrosive wear.

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“…In contrast, for during pin-on-disc tests using silicon nitride pins on metal, 43) tests carried out using a load of 60 N corresponding to a pressure of 2.5 GPa showed significant improvements in the specific wear rates of both M50 and M50NiL in the duplex-hardened condition (Fig. 12).…”

Section: )6mentioning

confidence: 91%

Duplex Hardening of Steels for Aeroengine Bearings

Ooi

Bhadeshia

2012

ISIJ Int.

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Duplex hardening is a process in which conventional heat-treatments such as secondary or case hardening are followed up by surface nitriding to achieve exceptional properties, particularly in the context of aeroengine bearings. Hardness values in excess of 1 000 HV can in principle be achieved, and although the hardness decreases as a function of depth below the surface, some level of enhancement can occur to a depth of up to 0.2 mm. The process can be applied to both through hardened and case hardened bearing steels such as M50 and M50NiL respectively, with concomitant increases in rolling contact fatigue resistance and tribological properties. The process has not yet been universally adopted and is ripe for a critical assessment.

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Wear performance of oil lubricated silicon nitride sliding against various bearing steels

Cited by 68 publications

References 20 publications

The influence of contact conditions on surface reaction layers formed between steel surfaces lubricated by an aviation oil

The influence of contact conditions on surface reaction layers formed between steel surfaces lubricated by an aviation oil

The effects of diesel contaminants on tribological performance on sliding steel on steel contacts

Duplex Hardening of Steels for Aeroengine Bearings

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