摘要:

A series of studies was conducted in the jour-ball wear tester to better define the roles of volatility, environment, and polar impurities in boundary lubrication. A number of well-defined, super-refined mineral oils, free from polar impurities, were utilized as base stocks for these studies. The effect of volatility as a factor in wear is conclusively shown. Volatile base stocks were used to illustrate the effects of less volatile polar and nonpolar impurities. The relative importance of volatility of lubricity additives is also demonstrated. Methods for the quantitative measurement of dissolved gases including oxygen in the lubricant under practical test conditions are illustrated. The relationship between dissolved oxygen and wear is shown for several lubricants. The interrelationship between dissolved oxygen, lest temperature, load, and fluid is also discussed.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Rochester, New York, October 15–17, 1963.

ISSN:0569-8197    

DOI:10.1080/05698196408972030

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Thrust ball bearing studies in which the surface topography of bearing races was examined with an electron microscope and in which additive elements were measured on ball surfaces by X-ray fluorescence have indicated that surface films of appreciable thickness are formed by oil additives and that the additive composition controls both surface topography and surface coating composition. Further, additive concentration, friction-time, and oil temperature studies have shown that the composition and/or thickness of the surface film is a function of the additive concentration, and suggest that most of the surface-active additives read in some manner rather than physically adsorb on surfaces. However, friction measurements correlate only to a limited degree with either the measured surface film composition or the observed topography.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Rochester, New York, October 15–17, 1963.

ISSN:0569-8197    

DOI:10.1080/05698196408972031

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Measurements have been made of the coefficient of friction of a steel pin sliding on a steel ring lubricated with three commercial greases, various experimental greases or pastes, and other components of greases. After break-in at room temperature, heat was applied which reduced the friction of the greases to about half their room temperature value. The friction increased on cooling. The opposite effect was observed with base oil. The phenomenon was demonstrated in a ball thrust bearing operating under boundary conditions as a reduction in torque with heating and an increase in torque on cooling. The reduction in friction with heating was found to be due to the soap thickener. Pastes of CaCO3, fumed silica, and clay in oil, the base oil, and octadecane did not cause a reduction in friction. It was concluded that grease thickeners influence the friction of steel sliding on steel because of the formation of films on the surface of the metal.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Rochester, New York, October 15–17, 1963.

ISSN:0569-8197    

DOI:10.1080/05698196408972032

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

As technological advances are being made, the need for lubricants with higher load carrying capacities and stability to various environmental conditions are required. Nonadditive silicone fluids have approached the stability and temperature range required but have fallen short in their antiwear and load carrying ability for ferrous metals. The advent of fluoroalkylsiloxanes has brought about the much sought for boundary lubrication for steel sliding against steel as well as for other metal combinations.

ISSN:0569-8197    

DOI:10.1080/05698196408972033

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Recent changes in the design of aircraft engines have created a demand for lubricants that will perform satisfactorily under conditions far more rigorous than were ever experienced in the past. These increased demands cannot be met by conventional lubricants or by lubricants protected by conventional additives.

ISSN:0569-8197    

DOI:10.1080/05698196408972034

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Thermal decomposition temperatures of oil blends of the sine, nickel, and cadmium salts of the same dialkyldithiophosphoric acid were determined by the use of the isoteniscope. It was observed that the ease of decomposition and the order of stability of these metal dialkyldilhiophosphales were affected by: (a) the nature of the base oil used for the blends, (b) the presence of basic barium sulfonate in the blends, (c) the presence of air in the isoteniscope, and (d) the pressure in the isoteniscope.

ISSN:0569-8197    

DOI:10.1080/05698196408972035

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

A laboratory unit is described with a method for determining the deposit-forming tendencies and oxidation stabilities of lubricants in thin films. The test oil is passed over a spinning aluminum disk heated to temperatures of 500–650 F, which provides a dynamic oil film of about 0.0003 inch thickness. Oxidation stability is determined by measurement of the oxygen consumed. The deposits on the disk are estimated visually. The test can be used for comparative evaluation of base fluids and inhibited fluids.

ISSN:0569-8197    

DOI:10.1080/05698196408972036

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Results of adhesion tests performed on yttrium (Y), as well as four rare earth metals, samarium (Sm), gadolinium (Gd), dysprosium (Dy), and holmium (Ho), are reported. A modification of the twist-compression bonding method was used to obtain the coefficients of adhesion. Low adhesion values for the above metals were obtained as expected on the basis of the crystal structure considerations. A proposal is made to apply the atomic “size-factor” criterion to the prediction of adhesion properties of dissimilar metals. An illustration of the method is given in terms of adhesion of iron to the above mentioned metals.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Rochester, New York, October 15–17, 1963.

ISSN:0569-8197    

DOI:10.1080/05698196408972037

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Pin on disc friction tests and crossed-cylinder load carrying tests were run in air and in vacuum. Dry friction behavior was found to be very sensitive to pressure level and previous history of the specimens. Lubricated friction behavior for the lubricants tested was essentially independent of pressure unless there was selective evaporation of friction-reducing additives in the lubricant. Most of the fluids tested evaporated very slowly in these room temperature tests.

ISSN:0569-8197    

DOI:10.1080/05698196408972038

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The friction and wear characteristics of various carbon materials sliding on metals and aluminum oxide were determined in vacuum at ambient pressures from 760 to 10−9mm Hg. The friction and wear experiments were conducted with a hemispherically tipped carbon rider, under a load of 1000 gm, sliding on various disks rotating at a speed of 390 ft per minute. The results of this investigation show that additional research on carbon in vacuum is warranted. Adsorbed surface films present on both carbons and metal, as well as the presence of oxide on metals, appreciably influenced the friction and wear obtained with carbons in vacuum. Some impregnants were beneficial in reducing friction and wear of carbon in vacuum while others were not.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Rochester, New York, October 15–17, 1963.

ISSN:0569-8197    

DOI:10.1080/05698196408972039

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor