Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases
Abstract The mechanism of grease replenishment in and around a starved point contact was studied in this work. Greases made of different thickeners and same base oil were tested and compared. Disappearing and re-formation of a dynamic grease reservoir during operation revealed that grease bled oil t...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2016-12-01
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| Series: | Friction |
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| Online Access: | http://link.springer.com/article/10.1007/s40544-016-0123-9 |
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| author | Lu Huang Dan Guo Xiang Liu Guoxin Xie George T. Y. Wan Shizhu Wen |
| author_facet | Lu Huang Dan Guo Xiang Liu Guoxin Xie George T. Y. Wan Shizhu Wen |
| author_sort | Lu Huang |
| collection | DOAJ |
| description | Abstract The mechanism of grease replenishment in and around a starved point contact was studied in this work. Greases made of different thickeners and same base oil were tested and compared. Disappearing and re-formation of a dynamic grease reservoir during operation revealed that grease bled oil to replenish contact. However, the replenishment process was slow because of the presence of grease fingers along the track and thickener-deposited film inside the track. The contact angles of base oil on the chromium-coated surface and thickener-deposited surfaces were measured. Results proved that the contact angle on the deposited film remarkably increased compared with that on the chromium-coated surface from 25° to more than 40°. However, the deposited film could be consumed with continuous rolling, and replenishment was then enhanced. |
| format | Article |
| id | doaj-art-741e5fb8a16549eb99b9a9067f7d8673 |
| institution | OA Journals |
| issn | 2223-7690 2223-7704 |
| language | English |
| publishDate | 2016-12-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Friction |
| spelling | doaj-art-741e5fb8a16549eb99b9a9067f7d86732025-08-20T02:07:34ZengTsinghua University PressFriction2223-76902223-77042016-12-014431332310.1007/s40544-016-0123-9Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greasesLu Huang0Dan Guo1Xiang Liu2Guoxin Xie3George T. Y. Wan4Shizhu Wen5National Institute of MetrologyState Key Laboratory of Tribology, Tsinghua UniversityNational Institute of MetrologyState Key Laboratory of Tribology, Tsinghua UniversityState Key Laboratory of Tribology, Tsinghua UniversityState Key Laboratory of Tribology, Tsinghua UniversityAbstract The mechanism of grease replenishment in and around a starved point contact was studied in this work. Greases made of different thickeners and same base oil were tested and compared. Disappearing and re-formation of a dynamic grease reservoir during operation revealed that grease bled oil to replenish contact. However, the replenishment process was slow because of the presence of grease fingers along the track and thickener-deposited film inside the track. The contact angles of base oil on the chromium-coated surface and thickener-deposited surfaces were measured. Results proved that the contact angle on the deposited film remarkably increased compared with that on the chromium-coated surface from 25° to more than 40°. However, the deposited film could be consumed with continuous rolling, and replenishment was then enhanced.http://link.springer.com/article/10.1007/s40544-016-0123-9greasestarvationthickenerdeposited filmreplenishmentcontact angle |
| spellingShingle | Lu Huang Dan Guo Xiang Liu Guoxin Xie George T. Y. Wan Shizhu Wen Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases Friction grease starvation thickener deposited film replenishment contact angle |
| title | Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases |
| title_full | Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases |
| title_fullStr | Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases |
| title_full_unstemmed | Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases |
| title_short | Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases |
| title_sort | effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases |
| topic | grease starvation thickener deposited film replenishment contact angle |
| url | http://link.springer.com/article/10.1007/s40544-016-0123-9 |
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