Journal of Synthetic Lubrication最新文献_第2页

Rheological and tribological characterisation of six wet lubricants for space 六种航天用湿式润滑剂的流变学和摩擦学特性

Journal of Synthetic Lubrication Pub Date : 1994-04-01 DOI: 10.1002/JSL.3000110104

J. Sicre, Y. Berthier, L. Flamand, P. Reynaud, P. Vergne, M. Godet

{"title":"Rheological and tribological characterisation of six wet lubricants for space","authors":"J. Sicre, Y. Berthier, L. Flamand, P. Reynaud, P. Vergne, M. Godet","doi":"10.1002/JSL.3000110104","DOIUrl":"https://doi.org/10.1002/JSL.3000110104","url":null,"abstract":"Dry lubricants are often used in space because of their excellent behaviour in a vacuum and their thermal stability. However, mechanisms which are heavily loaded, with a high sliding rate, a long life span, or needing a stable friction coefficient cannot use this kind of product. They can be replaced by wet lubricants specially developed for vacuum applications. Such lubricants have a low vapour pressure in order to minimise outgassing losses and avoid contamination. \u0000 \u0000 \u0000 \u0000Since European experience in the field of wet lubrication in space is rather limited, the French Space Agency CNES, with the help of the LMC (Laboratoire de Mecanique des Contacts - Contact Mechanics Laboratory), is currently characterising several wet lubricants for use in space applications. \u0000 \u0000 \u0000 \u0000The selected lubricants were tested on a vacuum friction test bench which allows the main contact parameters to be controlled: speed, load, and kinematics. The bench is equipped with vacuum facilities and, since it runs under air, neutral gas, or vacuum, it can be used to study the effects of atmosphere. Variations of physical properties (viscosity) versus temperature (−60°C to 100°) and pressure (from atmospheric pressure to 500 MPa) were studied for all the lubricants tested, and these characteristics take into account in the analysis of the tribological test results. \u0000 \u0000 \u0000 \u0000This paper briefly lists the characteristics of a space environment (vacuum, microgravity, etc.) and their consequences for lubrication. It describes the equipment used and the tribological and rheological test results obtained on six wet lubricants (three oils and three greases). It also contains conclusions in terms of recommendations about the use of such lubricants.","PeriodicalId":17149,"journal":{"name":"Journal of Synthetic Lubrication","volume":"59 2","pages":"35-44"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91498718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The tribology of plastics — an overview 塑料摩擦学综述

Journal of Synthetic Lubrication Pub Date : 1994-04-01 DOI: 10.1002/JSL.3000110105

Chenghe Wang

引用次数: 1

Improvement of silahydrocarbon performance with additives 添加剂对硅烃性能的改善

Journal of Synthetic Lubrication Pub Date : 1993-10-01 DOI: 10.1002/JSL.3000100302

S. Thomas, D. G. Campbell, C. Hsu

引用次数: 3

Use of a non-conventional synthetic basestock in the formulation of high-quality engine oils 在高品质发动机油的配方中使用非常规合成基础油

Journal of Synthetic Lubrication Pub Date : 1993-10-01 DOI: 10.1002/JSL.3000100305

G. Fisicaro, S. Fattori

引用次数: 3

Rheological properties of lithium, lithium complex, and sodium greases 锂、锂络合物和钠润滑脂的流变性能

Journal of Synthetic Lubrication Pub Date : 1993-10-01 DOI: 10.1002/JSL.3000100304

H. Åkröm, E. Höglund

{"title":"Rheological properties of lithium, lithium complex, and sodium greases","authors":"H. Åkröm, E. Höglund","doi":"10.1002/JSL.3000100304","DOIUrl":"https://doi.org/10.1002/JSL.3000100304","url":null,"abstract":"The rheological properties of two lithium, two lithium complex, and two sodium greases, all with the most common NLGI grade two, have been investigated. The greases are based on a mineral and a synthetic oil. The apparatus used was a cone-and-plate rheometer and an impacting-ball apparatus. \u0000 \u0000The impacting-ball apparatus used a steel ball, which impacted a lubricated sintered carbide plate, to measure the shear stress-pressure coefficient, γ, of the lubricant. At pressures found in elastohydrodynamic contacts this coefficient determined the limiting shear stress. The γ-value thus affects the coefficient of friction and consequently, lower γ-value means less friction. \u0000 \u0000The results from the impacting-ball apparatus showed that the γ-value was lower for the greases with a synthetic base oil and that the lithium greases gave a lower γ-value than the corresponding base oils. \u0000 \u0000Results from the cone-and-plate rheometer showed the characteristic shear thinning behaviour of the greases and the influence of shear history and temperature. The results from the cone-and-plate rheometer have also been fitted to a four parameter rheological model.","PeriodicalId":17149,"journal":{"name":"Journal of Synthetic Lubrication","volume":"15 1","pages":"225-236"},"PeriodicalIF":0.0,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73689997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Effect of testing conditions on friction and wear of a polyetheretherketone-based composite 试验条件对聚醚醚酮基复合材料摩擦磨损的影响

Journal of Synthetic Lubrication Pub Date : 1993-10-01 DOI: 10.1002/JSL.3000100303

Q. Guo, K. Friedrich

{"title":"Effect of testing conditions on friction and wear of a polyetheretherketone-based composite","authors":"Q. Guo, K. Friedrich","doi":"10.1002/JSL.3000100303","DOIUrl":"https://doi.org/10.1002/JSL.3000100303","url":null,"abstract":"Friction and wear characteristics of a type of polyetheretherketone (PEEK)- based composite were evaluated under two different loading pressures and sliding speeds (P = 1.0 MPa, V = 1.0 m/s and P=2.0 Mpa, V=3.3 m/s). The material was in contact with steel surfaces of two different roughnesses (Ra=0.15 μm and Ra=0.33 μm). Interface temperature, coefficient offriction, depth wear rate, and specific wear rate of the polymer composite changed considerably with the PV value and the counterface roughness. The interface temperature increased with increasing PV value, whereas the friction coefficient decreased. The depth wear rate at the higher PV value was much higher than that at lower PV. In addition, the rougher counterface resulted in a higher friction coefficient, depth wear rate, and specific wear rate, when the PV value was fixed. The effect of counterface roughness on the specific wear rate at the higher PV value was smaller than that at the lower PV. Further variations in friction and wear with testing conditions are discussed along with the corresponding microscopic observations of the worn polymer surfaces and the polymer transferred counterfaces.","PeriodicalId":17149,"journal":{"name":"Journal of Synthetic Lubrication","volume":"1 1","pages":"213-224"},"PeriodicalIF":0.0,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90810945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Magnetic fluids in sealing and lubrication – a state of the art review 密封和润滑中的磁流体——最新评述

Journal of Synthetic Lubrication Pub Date : 1993-07-01 DOI: 10.1002/JSL.3000100203

M. Säynätjoki, K. Holmberg

{"title":"Magnetic fluids in sealing and lubrication – a state of the art review","authors":"M. Säynätjoki, K. Holmberg","doi":"10.1002/JSL.3000100203","DOIUrl":"https://doi.org/10.1002/JSL.3000100203","url":null,"abstract":"The paper is a review of the properties and functions of magnetic fluids and their potential use in tribological applications, such as seals and bearings. They offer new possibilities for achieving low friction, low wear, and no leak- age. \u0000 \u0000Magnetic fluids or ferrofluids consist of magnetic particles suspended in a carrier fluid and a coating on the particles. The coating prevents the agglomeration of the particles through magnetic and molecular attraction by keeping the distance between them sufficiently large. The magnetic fluids have the basic properties of liquids and they act like ferromagnetic materials in the presence of an external magnetic field. \u0000 \u0000Shaft sealing is the most promising potential application for ferrofluids. Magnetic seals have zero-leakage and low friction, they are non-stick and they have high-performance properties. Lubrication is another important application of ferrofluids. The advantage over conventional lubricants is the possibility of keeping the lubricant exactly and only where it is needed. They provide the possibility of increasing the life of components. Furthermore, because they do not contaminate, ferrofluids are also used as lubricants in clean environments.","PeriodicalId":17149,"journal":{"name":"Journal of Synthetic Lubrication","volume":"3 1","pages":"119-132"},"PeriodicalIF":0.0,"publicationDate":"1993-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89498867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

A polyalphaolefin with exceptional low‐temperature properties 一种具有特殊低温性能的聚α -烯烃

Journal of Synthetic Lubrication Pub Date : 1993-07-01 DOI: 10.1002/JSL.3000100204

K. J. Theriot, R. L. Shubki

引用次数: 2

Hydrolysis of phosphate‐based aviation hydraulic fluids 磷酸基航空液压油的水解

Journal of Synthetic Lubrication Pub Date : 1993-07-01 DOI: 10.1002/JSL.3000100202

S. M. Aberathy, J. Laurent

引用次数: 11

Soluble additives for perfluorinated lubricants 全氟润滑油的可溶性添加剂

Journal of Synthetic Lubrication Pub Date : 1993-07-01 DOI: 10.1002/JSL.3000100205

P. Srinivasan, C. Corti, L. Montagna, Paolo Savelli

引用次数: 15