摘要:

Presented at the first ASLE International Conference on Solid Lubrication held in Denver, Colorado, August 24–27, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983249

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

This paper describes a new technique for producing adherent solid lubricant films with full control of thickness and location. MoS2and FeCl2/CrCl3coatings are formed on Mo and Fe/Cr wires respectively by electrochemical deposition from a bath of molten LiCl/KCl, and their frictional behaviour is studied at 400 C. It is suggested that this method has applications in fundamental studies of solid-film and extreme-pressure lubrication, and also in warm wire-drawing and other metal-forming processes.Presented at the first ASLE International Conference on Solid Lubrication held in Denver, Colorado, August 24–27, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983250

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Examination of adsorptive properties of graphite and MoS2revealed that their surfaces are composed of two distinct sites, i.e., basal plane and edge sites, having different affinities for polar compounds and paraffmic hydrocarbons.

ISSN:0569-8197    

DOI:10.1080/05698197108983251

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Sputtered MoS2films (2000–6500 Å) were deposited on highly polished metal surfaces. These films have a low coefficient of friction (0.03–0.04) at speeds of 40–80 rpm and loads of 250–1000 grams. At loads of 250 grams the wear lives are over 0.5 million cycles, but at 1000 gram loads, it decreases to 38,000 cycles. Friction experiments and tensile tests have indicated that sputtered films have a strong adherence to metal surfaces. Electron transmission, diffraction and scanning electron microscopy show that these films have an extremely small particle size, less than 30 Å in diameter, and are very dense and free from observable pinholes. The high kinetic energy of these sputtered species, the submicroscopic particle size and the sputter-etched substrate surface is responsible for strong adhesion and cohesion of the sputtered film.Presented at the first ASLE International Conference on Solid Lubrication held in Denver, Colorado, August 24–27, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983252

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

A method has been developed for recording the elastic roll body contacts in the load zone for both radial and thrust rolling element bearings subjected to various static loading conditions. Employed in this investigation were a ball bearing and four types of roller bearings which included cylindrical, needle, tapered and spherical. Inspection of the contact areas, or footprints, yields a qualitative measure of the extent of loading arc, load sharing among rolling elements, contact characteristics such as end loading and effects of misalignment. Quantitative data on individual contacts permits the determination of load and stress distributions. Summation of the vertical components of individual roll body loads agrees with the total load applied to the whole bearing, thereby demonstrating the practicability and accuracy of this technique. Correlation of roll body loads with theoretical values varied, depending on angular position from the radial load plane. Finally, this paper indicates how static stress levels on the most heavily loaded element may be obtained and used as a basis for bearing life prediction.Presented at the 26th ASLE Annual Meeting in Boston, Massachusetts, May 3–6, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983253

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

A variety of organophosphorus and other selected compounds were studied as antiwear additives for neopentyl polyol ester lubricants on 440C stainless steel rubbing surfaces using a four-ball wear test machine. Their effectiveness as additives was compared with that of tricresyl phosphate. Although 440C steel is relatively unreactive, it was possible to improve strikingly its wear and friction characteristics with organophosphorus additives. Some of the best results were obtained with acid phosphates. Alkyl chain length also appeared to be a significant factor. It was demonstrated that small concentrations of extraneous acidic substances are responsible for the antiwear action of phosphites at high load and that larger amounts of such acidic materials are needed as the load increases. Experiments involving addition of amines to neutralize formulations containing an acid phosphate confirmed that free acids promote antiwear action at the higher loads. Vinyl stearate and selected compounds containing chlorine or sulfur proved ineffective as additives for 440C steel in the antiwear region.Presented at the 26th ASLE Annual Meeting in Boston, Massachusetts, May 3–6, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983254

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Bearings of 350-, 363-, and 450-square-inch area and ranging up to 31.5-inch outside diameter were tested at speeds up to 5000 rpm and at loads up to 1000 psi. Laminar-turbulent transition conditions are analyzed as well as performance relations for both regimes.Presented at the 26th ASLE Annual Meeting in Boston, Massachusetts, May 3–6, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983255

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Viscoseals performance as predicted by three different analytical models is compared with experimental data for air as the continuum gas sealant. An experimental investigation has been conducted on two multiple-grooved two-inch diameter viscoseals up to shaft speeds of 35,000 rpm. The two seal geometries considered differ significantly insofar as groove aspect ratio is concerned. The results of this continuum investigation of sealing coefficient for the gas viscoseals suggest that the Boon and Tal model is a good design tool for the laminar continuum regime provided it is restricted to high aspect ratio groove applications.Presented at the 26th ASLE Annual Meeting in Boston, Massachusetts, May 3–6, 1971

ISSN:0569-8197    

DOI:10.1080/05698197108983256

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

By means of x-ray structure analysis investigations were made on {111}-planes in gold deformed by friction. As a result of the friction a thin, facet-like, polycrystalline surface layer is produced, whose crystal planes showed a characteristic, directional tilt from the original position of the {111}-plane. The amount of the tilt can be expressed by a medium tilting angle. The depth of deformation under the stress of N = 5 p and a slideway of L = 580 cm was found to be 50 μm.

ISSN:0569-8197    

DOI:10.1080/05698197108983257

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The performance of a high aspect-ratio visco seal operating with a power-law sealant under laminar isothermal conditions is investigated theoretically. Curves are presented showing the effects of the power-law exponent and the average seal shear rate on the seal leakage and the sealing coefficient. The results indicate that deviations from Newtonian behavior can substantially alter the performance of visco seals.

ISSN:0569-8197    

DOI:10.1080/05698197108983258

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor