摘要:

AbstractIn the present work, Matrix‐Assisted Laser Desorption/lonisation Time‐of‐Flight Mass Spectrometry (MALDI‐TOFMS) is demonstrated to be a valuable method for the analysis of synthetic polyol ester turbine engine oils. A softionisation technique, it generates, under adequate experimental conditions only, (quasi‐)molecular ions and allows detection and identification of all components including di‐ and tripentaerythritol esters and oligomeric additives, without pre

ISSN:0265-6582    

DOI:10.1002/jsl.3000150202

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractA number of transesterified and alkarylated derivatives have been synthesised from available vegetable oils of Indian origin. The viscosity, viscosity index, freezing points, load‐carrying characteristics, friction coefficient, and thermo‐oxidative stability of these derivatives as compared to highly refined hydrorefined hydrocarbon oils have been studied.It has been found that several esters of fatty acids of these vegetable oils have a high natural viscosity index, low pour points, and high thermooxidative stability, and can meet the requirements as base fluid components for energy‐efficient, eco‐friendly, long‐drain interval, multigrade oils. These oils have markedly lower viscosities at 40°C, higher load‐carrying characteristics, and lower friction coefficients than the base fluids of currently marketed multigrade oils. A 50% blend with hydrorefined hydrocarbon oils could prove highly viable.The above results clearly establish the potential for utilising these esters, either alone, or in combination with mineral oils, for formulating cost‐effective high‐performance, energy‐efficient, and environmentally friendly lubricants. Performance characteristics of these oils as engine oils, automotive gear oils, and 2 stroke oil with conventional additives and with alternative additives are under investigation in comparison to the most advanced hydrocarbon based multigrade oil formulations of l

ISSN:0265-6582    

DOI:10.1002/jsl.3000150203

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractThe potential for co‐depositing PTFE particles in a metal matrix by means of electrodeposition has led to a new generation of composites that show promising tribological properties. In the present work, a study has been made of the parameters of the coating process (type of current, current density, and concentration of PTFE in the electrolyte bath) in order to optimise the properties of coating

ISSN:0265-6582    

DOI:10.1002/jsl.3000150204

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractA combination of environmental legislation and a need for improved economics currently presents both OEMs and fleet owners with a conflicting set of performance and operational requirements. These include lower emission and paniculate levels, fuel economy, longer drain/service intervals, and enhanced engine durability. Improved engine lubricants will play a crucial role in achieving these goals. The impact of base‐fluid composition and viscosity grade on emission/paniculate levels and fuel economy of a Euro II engine has been investigated. Polyalphaolefin‐based lubricants appear as an encouraging solution, as shown by our results centred on an SAE 5W40 gr

ISSN:0265-6582    

DOI:10.1002/jsl.3000150205

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000150206

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000150207

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000150208

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000150201

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY