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Pin-on-Disc Study of Tribological Performance of Standard and Sintered Gear Materials Treated with Triboconditioning Process: Pre-treatment by Pressure-induced Tribo-film formation
(SKD)
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-2489-0688
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-4447-3363
2016 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397XArticle in journal (Refereed) Accepted
Abstract [en]

oating is one of the innovative approaches used to improve the wear resistance and load-carrying capacity of surfaces in rolling-sliding contact, such as gears and rolling element bearings. In this study, the tribological performance of standard gear material (16MnCr5) and two kinds of powder metallurgy (PM) gear material (Distaloy AQ + 0.2% C and Astoloy 85Mo +0.2% C) with and without tribofilms formed by a pre-treatment were evaluated. Specimens treated with the pre-treatment and the substrate is subjected to pin-on-disc tests under boundary lubrication conditions. The friction and wear performance of the two different PM gear materials with the pre-treatment formed tribo-film were compared to RS-RS (16MnCr5 material disc and pin combination) for reference. It was found that the pre-treatment lowers the friction coefficient and enhances the wear resistance of pins because of the tribo-film formed. The tribo-film caused good running-in due to the existing of  and Fe and W oxides. Mo-Mo (Astoloy 85Mo + 0.2% C material disc and pin combination) and Mo-RS (Astoloy 85Mo + 0.2% C disc and 16MnCr5 pin combination) showed statistically significant higher wear resistance.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2016.
Keyword [en]
Gear material, Powder metallurgy, Pre-treatment, Wear, Friction
National Category
Tribology
Research subject
Industrial Engineering and Management
Identifiers
URN: urn:nbn:se:kth:diva-187443DOI: 10.1080/10402004.2016.1146379OAI: oai:DiVA.org:kth-187443DiVA: diva2:930141
Note

QC 20160523

Available from: 2016-05-23 Created: 2016-05-23 Last updated: 2017-11-30Bibliographically approved
In thesis
1. Efficiency and wear properties of spur gears made of powder metallurgy materials
Open this publication in new window or tab >>Efficiency and wear properties of spur gears made of powder metallurgy materials
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Powder metallurgy (PM) is usually used in manufacturing parts with complex geometries, such as gears and structural parts. The main attractions of PM are the high rate of material utilization, environmental friendliness of production, economic advantages (especially for complex geometries), and possibility of obtaining lighter components. To find a wide range of applications and compete with regular steel gears, PM gear transmissions should have good transmission efficiency and wear properties. Furthermore, they should have low contact noise and adequate surface fatigue properties. Because of the porosity structure of PM gears both on gear flanks and in the body, the friction and wear properties of PM gear flank contacts differ somewhat from those of regular steel gears.

   This doctoral thesis examines the efficiency and wear properties of PM gears. Paper A compares the wear, friction, and damage mechanism properties of two sintered gear materials with those of a standard gear material. Paper B deals with the gear mesh torque loss mechanism of PM and regular steel gears by combining both pin-on-disc frictional and FZG efficiency tests. Paper C comparatively examines the efficiency of PM and regular steel gears by conducting FZG gear efficiency tests. Paper D focuses on the wear and friction properties of PM and regular steel gear materials treated using the triboconditioning process. Paper E studies the friction and wear properties attributable to different pore sizes in PM gear materials.

   The results indicate that regular steel meshed with PM gear material and PM meshed with PM gear material are good candidate combinations for gear transmissions. This is because the porosities of PM material can lower the friction coefficient while the wear rate can be the same as or even better than that of regular steel contacts. The triboconditioning process enhances the wear resistance and reduces the friction coefficient of the PM gear material. The friction and wear coefficients of PM meshed with PM gear material display increasing trends with increasing pore size. The friction and wear coefficients of regular steel meshed with PM gear material display decreasing trends with increasing pore size.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 125 p.
Series
TRITA-MMK, ISSN 1400-1179 ; 2016:04
Keyword
Powder Metallurgy Gears; Efficiency; Wear; Friction; Porosity Structure; FZG gear test rig
National Category
Tribology
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-187446 (URN)978-91-7595-963-4 (ISBN)
Public defence
2016-06-03, Galanta, Brinellvägen 83, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20160523

Available from: 2016-05-23 Created: 2016-05-23 Last updated: 2016-05-23Bibliographically approved

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Olofsson, UlfBergseth, Ellen

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