摘要:

AbstractCombinations of additives are often found to exhibit antagonistic or synergistic effects compared to the performance of the individual additives. This paper reviews the state of knowledge concerning such effects. Direct interactions, where two additives combine at a molecular level, are distinguished from complementary or exclusary effects where the individual contributions of separate additives enhance or reduce overall performance but with no direct interaction. Additive interactions take place in solution and at surfaces, and both are discussed.

ISSN:0954-0075    

DOI:10.1002/ls.3010020102

出版商:John Wiley&Sons, Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractThis paper examines the behaviour of a grease lubricant in open contacts. Analytical expressions of velocity profiles for a Bingham fluid are presented for three cases: flow where all the film thickness is sheared; where a non‐sheared core zone is attached to one contact surface; and where a core zone floats in the middle of the film. An experimental study is described which used visualization through illumination across contact surfaces. Results are presented for two modes of operation: contact of cylinder and fixed plane surface, and pure rolling of two cylinders. In the former case, nine zones of operation are identifie

ISSN:0954-0075    

DOI:10.1002/ls.3010020103

出版商:John Wiley&Sons, Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractThis paper looks at the wear of steel under lubricated rolling‐sliding contact, with two paraffinic oils and a pure n‐hexadecane. A two‐disc apparatus was used, with a constant applied load, the surfaces being analyzed by X‐ray photoelectron spectroscopy. The oils were tested with and without additives (dibenzyl disulphide and diphenyl disulphide), and the differences a

ISSN:0954-0075    

DOI:10.1002/ls.3010020104

出版商:John Wiley&Sons, Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractCertain nitrogen compounds and their derivatives used as antiwear additives in base stocks have been tested on a four‐ball machine and an HQ‐1 tester for their relative antiwear effectiveness. The preliminary results indicate that the heterocyclic nitrogen compounds, in general, have a beneficial effect on the antiwear performance of base stocks. Hydroxy groups involved in some nitrogen‐containing compounds have been found to improve their antiwear performance significantly. In particular, one of the hydroxy‐substituted benzothiazoles is most effective in wear reduction and anti‐scuffing. However, the beneficial effect of a hydroxy group has not been observed for short‐c

ISSN:0954-0075    

DOI:10.1002/ls.3010020105

出版商:John Wiley&Sons, Ltd    

年代:1989

数据来源: WILEY

ISSN:0954-0075    

DOI:10.1002/ls.3010020101

出版商:John Wiley&Sons, Ltd    

年代:1989

数据来源: WILEY