Investigation of lubricated rolling sliding behaviour of WC/C, WC/C-CrN, DLC based coatings and plasma nitriding of steel for possible use in worm gearing

Benedetti, M.; Fontanari, V.; Torresani, Elisa; Girardi, Christian; Giordanino, Lorenzo

doi:10.1016/j.wear.2017.02.029

“…As a comparison, the uncoated gear failed after only 32 million cycles. Benedetti et al [84] investigated the effects of WC/C, WC/C-CrN, and DLC based coatings on lubricated contact behavior. The multi-layer WC/C and WC/CrN based coatings, together with the DLC coating showed a good contact fatigue performance, but these coatings were still unable to prevent the micro-pitting occurrence at the end of the tests.…”

Section: Gear Surface Microscopic Topographies and Surface Treatmentsmentioning

confidence: 99%

A Review on Micropitting Studies of Steel Gears

Liu

¹

,

Liu

²

,

Zhu

³

et al. 2019

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With the mounting application of carburized or case-hardening gears and higher requirements of heavy-load, high-speed in mechanical systems such as wind turbines, helicopters, ships, etc., contact fatigue issues of gears are becoming more preponderant. Recently, significant improvements have been made on the gear manufacturing process to control subsurface-initiated failures, hence, gear surface-initiated damages, such as micropitting, should be given more attention. The diversity of the influence factors, including gear materials, surface topographies, lubrication properties, working conditions, etc., are necessary to be taken into account when analyzing gear micropitting behaviors. Although remarkable developments in micropitting studies have been achieved recently by many researchers and engineers on both theoretical and experimental fields, large amounts of investigations are yet to be further launched to thoroughly understand the micropitting mechanism. This work reviews recent relevant studies on the micropitting of steel gears, especially the competitive phenomenon that occurs among several contact fatigue failure modes when considering gear tooth surface wear evolution. Meanwhile, the corresponding recent research results about gear micropitting issues obtained by the authors are also displayed for more detailed explanations.

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“…Test results demonstrated the good tribological properties of coatings in that case as well. Further works [4,12,16,18] concerning research on the properties of multi-layer a-C:H:W coatings and of WC/C coatings also confirm the reduction of the wear of the elements to which low-friction coatings were applied. sciENcE aNd tEchNology…”

Section: Introductionmentioning

confidence: 66%

The influence of selected PVD coatings on fretting wear in a clamped joint based on the example of a rail vehicle wheel set

Kowalski¹

2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…Test results demonstrated the good tribological properties of coatings in that case as well. Further works [4,12,16,18] concerning research on the properties of multi-layer a-C:H:W coatings and of WC/C coatings also confirm the reduction of the wear of the elements to which low-friction coatings were applied. sciENcE aNd tEchNology…”

Section: Introductionmentioning

confidence: 81%