摘要:

AbstractZinc dialkyldithiophosphates (ZDDP) cannot be used as additives in biodegradable lubricants because of their zinc content. In investigating substitutes for ZDDP, dialkyldithiophosphate esters have been synthesised, and their tribological behaviour as additives in rape seed oil has been evaluated using a four‐ball friction and wear tester and compared with that of ZDDP. The results show that these additives have better antiwear properties and load‐carrying capacity than rape seed oil alone. The morphologies and the elemental chemical states on the worn surfaces of the lubricated steel balls of the tester were examined using X‐ray photoelectron spectroscopy and scanning electron microscopy. The tribological mechanism is discussed on the basis of the experimental re

ISSN:0265-6582    

DOI:10.1002/jsl.3000190202

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

摘要:

AbstractEngineering polymers are increasingly being used as self‐lubricating materials in demanding high‐load applications. In this study, a comparison has been made of the tribological behaviour under high‐load conditions of two grades of polyamide and polyethylene terephthalate as well as polyacetal. Large‐scale testing is used to reduce edge effects. It has been found that the two grades of polyamide and pure polyethylene terephthalate are prone to stick—slip, while internally lubricated polyethylene terephthalate and polyacetal show low friction and wear and no s

ISSN:0265-6582    

DOI:10.1002/jsl.3000190203

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

摘要:

AbstractTailor‐made esters are becoming more widely used as either synthetic base stocks or performance additives for producing, for example, premium‐grade synthetic or semi‐synthetic speciality greases, aviation lubricants, or metal‐working fluids. The present work, using a laboratory batch autoclave to evaluate the kinetic parameters, considers the kinetics of a typical non‐catalytic esterification of a suitable polyol at elevated temperatures (190‐220°C) and corresponding vapour pressure. The proposed rate equation represents satisfactorily the progress of

ISSN:0265-6582    

DOI:10.1002/jsl.3000190204

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

摘要:

AbstractVarious polyamides (PAs) containing different CONH2/CH2ratios were selected for abrasive wear studies. Eleven types of silicon carbide (SiC) papers varying in particle size (10–175 μm) were selected as abrading counterfaces. The wear performance under single‐pass conditions indicated that the selected PAs did not show a size effect, in contrast to the case of metals and some other polymers. Wear rates were of the order of 2–17 × 10−11m3/Nm. Scanning electron micrographs of some of the worn papers indicated correlations between wear and the size and number of wear debris particles and the amount of material transferred to t

ISSN:0265-6582    

DOI:10.1002/jsl.3000190205

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

摘要:

AbstractTwo types of phosphorus—nitrogen‐modified rape seed oils as biodegradable lubricant additives were synthesised and characterised by infrared spectroscopy. Their tribological properties in rape seed oil and in mineral oil were evaluated in a four‐ball tester. The morphologies of the worn surfaces were analysed by scanning electron microscopy. The results show that the modified rape seed oil additives improve the load‐carrying capacity and the antiwear and friction‐reducing properties of rape seed oil more than they do those of mineral oil. The inferred mechanism of lubrication is that a high‐strength adsorption film and/or tribochemical reaction film forms on the rubbing surfaces, due to the carrier effect of long‐chain rape seed oil molecules and to the high reaction activities of phosphorus and nitrogen and th

ISSN:0265-6582    

DOI:10.1002/jsl.3000190206

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000190207

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000190208

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000190209

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000190201

出版商:John Wiley&Sons, Ltd    

年代:2002

数据来源: WILEY