摘要:

AbstractLubricants and functional fluids may be grouped into those based on natural oils and those having man‐made (‘synthetic’) base stocks. This paper is concerned with the ‘dilute synthetic lubricant’ in which the man‐made component is blended with a major proportion of water. The developments covered include hydraulic and metal‐cutting fluids, with examples drawn from experience with solutions and dispersions. The performance required from these fluids in service is discussed with particular attention to improvements in corrosion protection, antiwear performance, extreme‐pressure properties, foam inhibition, air release, rolling bearing fatigue and resistance to erosion pitting. Water quality can have a significant impact on the performance properties of the fluids already listed. The service properties of aqueous lubricants may be classified according to their response to chemical additives. Examples are given of properties which respond well to additives and of those which are governed largely by the bulk physical properties of water. Manufacturers of equipment are continuing to develop new machinery. Fluid formulators are seeking to extend the current operating limitations of aqueous fluids. Future development relies on close co‐operation between users, equipment suppliers and lubr

ISSN:0265-6582    

DOI:10.1002/jsl.3000020302

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThis paper describes Grease A, a high drop point PAO type grease with multiservice capability, developed to fill the performance/cost gap which has existed in industrial and automotive applications between mineral‐based multiservice greases and synthetic greases, either specialised, or with multiservice capability orientated towards military applications, and usually expensive. It also briefly gives details on Grease B and Grease C, two other greases based on the same chemistry as Grease A, developed for very specialised and severe applications which cannot be covered by a multiservice grease, even synthetic, such as Grease

ISSN:0265-6582    

DOI:10.1002/jsl.3000020303

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractIn order to establish correlations between the chemical structure or constitution of fluid lubricants and their friction characteristics under elastohydrodynamic conditions, a number of model test fluids were tested in a twin‐disk machine. As test fluids, special saturated monobi‐, and tricyclic compounds, alkanes and polyethers were selected. The traction coefficients were shown to be strongly dependent on the chemical structure of the lubricants and on operational parameters. High coefficient values mostly arise from lubricant molecules that are shaped irregularly, with indentations and teeth as seen with Stuart‐Briegleb models, and allowing only heavily hampered rotational intramolecular motions along single bond axes. Low traction coefficients derive from lubricant molecules with a thread‐like shape and a minimum of structural subunits or functional groups involved in significant intermolecular interactions. In order to account for the results obtained, several paradigms and hypotheses are established and discussed in

ISSN:0265-6582    

DOI:10.1002/jsl.3000020304

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020305

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020306

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020307

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020301

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY