摘要:

AbstractDuring thermal‐oxidative ageing of pentaerythritol ester‐based oils a variety of volatile degradation products, eg acids, aldehydes, ketones, esters and O‐heterocyclic compounds are produced. It is shown that quantitative determination of individual acids and carbonyls using GC‐MS and/or HPLC can be used to assess the ageing behaviour of fully formulated aviation turbine oils. Of special importance is the Tenax‐GC method which allows a simultaneous determination of all volatile degradation products by GC‐MS. This is the third of a series of papers on thermal‐oxidative ageing of neopentylpolyol

ISSN:0265-6582    

DOI:10.1002/jsl.3000020102

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractBlending synthetic fluids with conventional base stocks gave large reductions in low temperature viscosity without appreciable reductions in high temperature viscosity or deterioration in properties such as volatility or flash point. Ten percent blends of a polyalpbaolefin or an ester synthetic reduced the viscosity at — 27.9°C by approximately 50%. These blends gave improved oxidation stability as measured by the Aluminum Beaker Oxidation Test, but poorer antiwear performance as measured by the Four Ball Test. The latter result indicated that the antiwear additive package should be optimised to accommodate composition differences between conventional fluids and conventional/synthetic blen

ISSN:0265-6582    

DOI:10.1002/jsl.3000020103

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThis paper looks at the gear types and operating conditions to which synthetic lubricants are most suited, in terms of both economy and technical benefits. In examining the characteristics of, particularly, worm and non‐positive (friction wheel) gears, data is presented for operating temperature, boundary torque, traction coefficient and friction coefficient, showing the relative advantages in extreme conditions of polyglycols, and other synthetic

ISSN:0265-6582    

DOI:10.1002/jsl.3000020104

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractAn extensive range of base fluids has been considered for the formulation of partially and fully synthetic lubricants. In this paper, polyethers are discussed in relation to their tribological properties and chemical structure. Physical properties are reviewed, including water solubility, viscosity‐pressure and thermal stability. Oxidation stability is discussed, and tribological examination shows significant advantages of polyethers, with various additives, in friction, gear and other tests, compared with mineral oil

ISSN:0265-6582    

DOI:10.1002/jsl.3000020105

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020106

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020107

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000020101

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY