摘要:

Analysis of literature bearing-fatigue life results shows that fatigue life is not a simple function of the widely accepted specific film thickness, λ, which is the ratio of the EHL film thickness h to composite surface roughness [sgrave]. Instead, the influence of film thickness on bearing life increases with increasing surface roughness; at about 0.20 micrometer (8 microinch) composite roughness life increases with the square root of h while at about 0.46 micrometer (18 microinches) life increases with h squared.

ISSN:0569-8197    

DOI:10.1080/05698198108983039

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Adverse interactions of zinc dialkyldithiophosphate (ZDPs) with other required additives in an engine oil is one factor contributing to the high phosphorus content of some engine oils. Sine phosphorus poisons exhaust gas emission catalysts, ways to reduce the adverse interactions are being sought. The ZDP-amine interaction was investigated as a model of such an interaction. Above a critical concentration, amines can cancel the antiwear performance of ZDPs as measured in a 4-ball machine. At amine concentrations below the critical value, a synergistic antiwear effect was observed at higher loads. The tolerance of different ZDPs to the presence of amines was the same as the ranking of the ZDPs in terms of antiwear performance. A mechanism for the antiwear action of ZDPs involving the formation of an acid phosphate decomposition product has been proposed.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983040

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Wear studies carried out in conjunction with a study of the kinetics and mechanism of the autoxidation of pentaerythrityl tetraheptanoate (PETH) showed that small degrees of oxidation produced large increases in wear rate. The results indicate that monoesters of dicarboxylic acids in conjunction with hydroperoxides are the oxidation products which result in the increased wear.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983041

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Basic studies of abrasive wear have been performed by controlled grooving in a modified impact tester equipped with a cemented carbide tip. Specimen holders were constructed to permit normal and tangential force measurements during grooving and to enable quick-stop tests. The grooving energy is read directly from the standard pendulum meter or integrated from tangential force curves.

ISSN:0569-8197    

DOI:10.1080/05698198108983042

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The effect of oil films was investigated under comparatively mild conditions of boundary lubrication (up to 10 MPa) using electrical methods.

ISSN:0569-8197    

DOI:10.1080/05698198108983043

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Friction under boundary lubrication was measured using a pendulum-type friction machine. Long straight-chain fatty acids with even carbon numbers, amine, and alcohol were used as additives, and n-hexadecane was used as the base oil.

ISSN:0569-8197    

DOI:10.1080/05698198108983044

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Optical Interferometry is used to study the film thickness of greases, and of soap suspensions and of their base oils in point or line contact. In one case, samples were taken from a grease-lubricated plain-bearing test after 5 1/2- and 25-million revolutions. The effective viscosity of a grease under the very high shear rates of the order of 1/2 × 10-6s-1encountered in rolling contacts can be calculated.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983045

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The influence of fluid contamination on the wear of a number of aircraft dry bearing liners has been examined using a recently developed, accelerated test procedure. It is shown that fluids generally increase wear to an extent depending on the level of stress, the type of fluid and the structure and composition of the liner material. Water is invariably deleterious but, at low stresses, mineral and diester oils can sometimes reduce the wear rate below that obtained in dry conditions. Explanations for the trends observed are deduced from a detailed examination of worn surfaces by X-ray photo-electron spectroscopy (XPS) and scanning electron microscopy (SEM). The relevance of the results to current specification requirements for aircraft dry bearings is discussed, and a number of inadequacies exposed.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983046

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

High-surface-area graphites, that can be prepared by grinding synthetic graphites in vibratory ball mills, can be used in a novel refining technique which can markedly reduce pour points of various petroleum distillates and can be used to prepare oil fractions with high viscosity indices. The treatment also lowers the content of aromatic and sulfur compounds and completely eliminates polycyclic aromatics.

ISSN:0569-8197    

DOI:10.1080/05698198108983047

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Detailed studies including synthesis, characterization and evaluation of antimony thioantimonate, SbSbS1, have been carried out. The amorphorus complex chalcogenide was prepared by a solution precipitation method. As a solid-lubricant additive in various greases, this material exhibits superior extreme-pressure and antiwear properties as demonstrated by the Four-Ball weld points and load-wear indexes on both AISI-52100 and AISI-440C steels. Antimony thioantimonate appears to be compatible with all the base greases investigated including a silicone grease in which very few additives show good response.Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference in San Francisco, California, August 18–21, 1980.

ISSN:0569-8197    

DOI:10.1080/05698198108983048

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor