摘要:

AbstractThis paper examines the use of water‐based hydraulic fluids in hydraulic pumps, Four different types of HFA fluid are reviewed in terms of properties and usage. In a research programme, two principal fluids, a HFA micro emulsion and a HFA solution, were evaluated in relation to their wear protection capability in a short‐term test procedure, and their operational behaviour and confirmation of the short‐term test procedure in a long‐term test. The differences between the fluids are mainly in terms of wear of the test pumps. It is concluded that a performance standard similar to oil‐based fluids has not yet bee

ISSN:0265-6582    

DOI:10.1002/jsl.3000040202

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractWater‐containing fluids are widely used in hydraulic applications where there is a significant risk of fire, as in underground mining and metal working applications. Although primarily intended as power transmitting media, hydraulic fluids need to possess a modicum of lubricating ability to limit wear, seizure and contact fatigue of pumps and other rubbing parts. Unfortunately water‐based hydraulic fluids generally show significantly poorer wear and rolling‐contact fatigue performance than mineral or synthetic oil‐based fluids of similar viscosity and this means that pumping equipment usually has to be derated when used with water‐based fluids. This paper examines the poor wear and fatigue performance of water‐based fluids and discusses, in some detail, the origins of this poor performance and the ways it can b

ISSN:0265-6582    

DOI:10.1002/jsl.3000040203

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractDifferent synthetic products currently available and which find wide application as lubricants, are described, and their merits and demerits compared with the mineral based lubricants are outlined. Some of the major synthetic lubricants used in Indian industries are identified. The Indian chemical industry's potential to meet some of the requirements of synthetic lubricants is discussed and the need to create additional facilities in India for the manufacture of certain critical products, is described.

ISSN:0265-6582    

DOI:10.1002/jsl.3000040204

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractBismaleimides are the addition type of polyimide resin. They are synthesized by reaction of diamino compounds with maleic anhydride. By varying the structure of the diamino compound it is possible to make various bismaleimides. This paper discusses improvement of the friction and wear properties of bismaleimide resin, by the addition of solid lubricant additives such as MoS2, graphite and PTFE.The bismaleimide tested has the following structure:On heating, bismaleimide cross links through its unsaturated bonds, thus producing a highly cross linked polyimide. The friction and wear measurements were done on a Plint friction and wear machine (pin on disc type), wherein polymer pins slid against a steel disc at different loads and speeds.The polymer itself had a high coefficient of friction, ranging from 0.3 to 0.6 and a higher wear rate. Solid lubricant additives helped in improving its friction and wear characteristics. The addition of graphite brought the coefficient of friction to 0.3 but wear remained high at high loads. Best results were obtained with additions to the resin of MoS2‐Sb2O3and PTFE. Composites with MoS2‐Sb203 and PTFE had low coefficient of friction and low rate of wear, at low as well as at high loads. It appears that these solid lubricant additives transfer to the counterface, thereby reducing effective counterface roughness, hence reducing both friction and w

ISSN:0265-6582    

DOI:10.1002/jsl.3000040205

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractA selection of future meetings of interest to the lubricants community. for full and precise details, reader should apply to the address given. Information on forthcoming lubricants conferences is welcome for inclusion in this section.

ISSN:0265-6582    

DOI:10.1002/jsl.3000040206

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

摘要:

AbstractAbstracts of papers presented on additives for lubricants and functional fluids at a Conference held at Eger, Hungary, in October 1986, organized by the Hungarian Chemical Society. The abstracts are selected and translated by Dr E. Vbmos, JSL East European Correspondent.

ISSN:0265-6582    

DOI:10.1002/jsl.3000040207

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000040208

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000040201

出版商:John Wiley&Sons, Ltd    

年代:1987

数据来源: WILEY