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Friction and wear of hot-pressed bearing materials containing molybdenum disulfide

Description: Report presenting an investigation to determine the feasibility of bearing lubrication by a process involving the transfer of molybdenum disulfide from within the structure of a composite bearing material to the interface between the contacting surfaces. The experiments were performed with a kinetic-friction apparatus employing a rotating steel disk and a bearing-specimen assembly suspended and restrained by metal springs.
Date: February 1950
Creator: Johnson, Robert L.; Swikert, Max A. & Bisson, Edmond E.
Partner: UNT Libraries Government Documents Department

Effects of Minimum Quantity Lubrication in Drilling 1018 Steel.

Description: A common goal for industrial manufacturers is to create a safer working environment and reduce production costs. One common method to achieve this goal is to drastically reduce cutting fluid use in machining. Recent advances in machining technologies have made it possible to perform machining with minimum-quantity lubrication (MQL). Drilling takes a key position in the realization of MQL machining. In this study the effects of using MQL in drilling AISI 1018 steel with HSS tools using a vegetable based lubricant were investigated. A full factorial experiment was conducted and regression models were generated for both surface finish and hole size. Lower surface roughness and higher tool life were observed in the lowest speed and feed rate combination.
Date: December 2008
Creator: Shaikh, Vasim
Partner: UNT Libraries

Effects of chemically active additives on boundary lubrication of steel by silicones

Description: Report presenting an investigation of a method of improving the lubricating quality of silicones by providing chemically active additives. The conventional additives were not effective, but more active materials like peroxide did provide effective lubrication.
Date: August 1954
Creator: Murray, S. F. & Johnson, Robert L.
Partner: UNT Libraries Government Documents Department

A visual photographic study of cylinder lubrication

Description: From Summary: "A V-type engine provided with a glass cylinder was used to study visually the lubrication characteristics of an aircraft-type piston. Photographs and data were obtained with the engine motored at engine speeds up to 1000 r.p.m. and constant cylinder-head pressures of 0 and 50 pounds per square inch. A study was made of the orientation of the piston under various operating conditions, which indicated that the piston was inclined with the crown nearest the major-thrust cylinder face throughout the greater part of the cycle. The piston moved laterally in the cylinder under the influence of piston side thrust."
Date: August 1, 1945
Creator: Shaw, Milton C. & Nussdorfer, Theodore
Partner: UNT Libraries Government Documents Department

Preliminary investigation of molybdenum disulfide-air-mist lubrication for roller bearings operating to DN values of 1 x 10(exp 6) and ball bearings operating to temperatures of 1000 degrees F

Description: The effectiveness of molybdenum disulfide MoS2 as a bearing lubricant was determined at high temperature and at high speeds. A 1-inch-bore ball bearing operated at temperatures to 1000 F, a speed of 1725 rpm, and a thrust load of 20 pounds when lubricated only with MoS2-air mist. A 75-millimeter-bore cageless roller bearing, provided with a MoS2-syrup coating before operation, operated at DN values to 1 x 10(exp 6) with a load of 368 pounds.
Date: October 15, 1951
Creator: Macks, E. F.; Nemeth, Z. N. & Anderson, W. J.
Partner: UNT Libraries Government Documents Department

Friction and wear investigation of molybdenum disulfide 2: effects of contaminants and method of application

Description: Report presenting a study using a low-speed kinetic-friction apparatus to show the effects of method of application and contaminants on the lubricating characteristics of molybdenum disulfide MoS2. Friction coefficients for the purified grade can vary from 0.025 to 0.12 just by changing the method of application.
Date: March 1954
Creator: Peterson, Marshall B. & Johnson, Robert L.
Partner: UNT Libraries Government Documents Department

Friction of surface films formed by decomposition of common lubricants of several types

Description: Report presenting an investigation to determine the effect on friction of films formed on steel surfaces by decomposition of common lubricants of several types. The films were formed by heating, in air, surfaces to which a thin film of fluid lubricant had been applied. Results regarding the fluid lubricants, decomposition films, surface loading, fluid lubricant on decomposition film, and practical significance are provided.
Date: April 1950
Creator: Johnson, Robert L.; Godfrey, Douglas & Bisson, Edmond E.
Partner: UNT Libraries Government Documents Department

Tests of Several Bearing Materials Lubricated by Gasoline

Description: "This investigation on the relative wear of several bearing materials lubricated by gasoline was conducted at the Langley Memorial Aeronautical Laboratory, as part of a general research on fuel injection engines for aircraft. The specific purpose of the work was to find a durable bearing material for gear pumps to be used for the delivery of gasoline and diesel engine fuel oil at moderate pressures to the high pressure pumps of fuel injection engines" (p. 1).
Date: July 1926
Creator: Joachin, W. F. & Case, Harold W.
Partner: UNT Libraries Government Documents Department

The Hydrodynamic Lubrication of Near-Infinite Sliders Such as Piston Rings

Description: "The lubrication of a piston ring is treated as though the ring were a rigid slider of finite width. An expression is obtained for pressure distribution which takes into account the effect of oil leakage from the ends of the ring and which has the convenient form of an end correction to the pressure-distribution formula for an infinite slider. The important formulas are summarized for convenience and two examples are included of their use in finding the pressure pattern over wide sliders" (p. 1).
Date: October 1944
Creator: Boegli, Charles P.
Partner: UNT Libraries Government Documents Department

Short-Bearing Approximation for Full Journal Bearings

Description: A short-bearing approximation of pressure distribution in the oil film is presented which is an extension of the pressure-distribution function of Michell and Cardullo and includes end-leakage effects. Equations giving applied load, attitude angle, location and magnitude of peak film pressure, friction, and required oil flow rate as functions of the eccentricity ratio are also given. The capacity number, a basic non dimensional quantity resulting from this analysis is the product of the Sommerfeld number and the square of the length-diameter ratio.
Date: October 1952
Creator: Ocvirk, F. W.
Partner: UNT Libraries Government Documents Department

Solid Lubrication Mechanisms in Laser Deposited Nickel-titanium-carbon Metal Matrix Composites

Description: A Ni/TiC/C metal matrix composite (MMC) has been processed using the laser engineered net shaping (LENS) process from commercially available powders with a Ni-3Ti-20C (atomic %) composition. This processing route produces the in-situ formation of homogeneously distributed eutectic and primary titanium carbide and graphite precipitates throughout the Ni matrix. The composite exhibits promising tribological properties when tested in dry sliding conditions with a low steady state coefficient of friction (CoF) of ~0.1 and lower wear rates in comparison to LENS deposited pure Ni. The as deposited and tribologically worn composite has been characterized using Auger electron spectroscopy, scanning electron microscopy (SEM), X-ray diffraction, high resolution transmission electron microscopy (HRTEM) with energy dispersive spectroscopy (EDS), dual beam focused ion beam SEM (FIB/SEM) serial sectioning and Vickers micro-hardness testing. The evolution of subsurface stress states and precipitate motion during repeated sliding contact has been investigated using finite element analysis (FEA). The results of FIB/SEM serial sectioning, HRTEM, and Auger electron spectroscopy in conjunction with FEA simulations reveal that the improved tribological behavior is due to the in-situ formation of a low interfacial shear strength amorphous carbon tribofilm that is extruded to the surface via refined Ni grain boundaries.
Date: December 2012
Creator: Mogonye, Jon-Erik
Partner: UNT Libraries

Effect of sliding velocity on friction properties and endurance life of bonded lead monoxide coatings at temperatures up to 1250 degrees F

Description: Report presenting studies to determine the effect of sliding velocity and ambient temperature on the friction properties and endurance lift of thin lead monoxide coatings bonded to type 440-C martensitic stainless steel. Results regarding the effect of run-in on endurance life are also provided.
Date: May 16, 1958
Creator: Sliney, Harold E.
Partner: UNT Libraries Government Documents Department

Effects of solvents in improving boundary lubrication of steel by silicones

Description: Report presenting a study to establish the effect of solvents on boundary lubrication by silicones. Boundary-lubrication data were obtained which are considered substantiating evidence for a hypothesis that, in solutions of solvents blended with silicones, the silicones form a closely packed and oriented absorbed film on ferrous surfaces. Results regarding room-temperature lubrication experiments, elevated-temperature lubrication experiments, low-temperature physical behavior, and effect of conventional lubrication additive are provided.
Date: September 1952
Creator: Murray, S. F. & Johnson, Robert L.
Partner: UNT Libraries Government Documents Department

Boundary lubrication of steel with fluorine- and chlorine-substituted methane and ethane gases

Description: Report presenting a study of the lubrication of steel by a series of stable fluorine- and chlorine-substituted methane and ethane derivatives. Several compounds containing fluorine and two or more chlorine atoms per molecule functioned as boundary lubricants to reduce friction and to prevent surface welding and metal transfer.
Date: February 1955
Creator: Murray, S. F.; Johnson, Robert L. & Swikert, Max A.
Partner: UNT Libraries Government Documents Department

Friction of solid films on steel at high sliding velocities

Description: Report presenting an investigation to identify the roles of solid-surface films in the mechanisms of sliding and lubrication involved in the mating and compatibility of boundary-lubricated slider surfaces, in the action of extreme-pressure lubricants, and in the operation of slider surfaces not supplied with fluid lubricants. Results regarding the films formed during run-in, films formed by extreme-pressure lubricants, and supplemental or dry-lubrication films are provided.
Date: April 1948
Creator: Johnson, Robert L.; Godfrey, Douglas & Bisson, Edmond E.
Partner: UNT Libraries Government Documents Department

A Bibliography on Gas Lubricated Bearings-Revised. Interim Report

Description: A compilation of 290 references on gas bearings is presented. In most cases an English resume' of each reference is included a translation being made when required. The references are arranged alphabetically by first author. Indexes included are the year of origin corporate author, subject, patent number, and country of origin. (J.R.D.)
Date: September 15, 1959
Creator: Sciulli, E. B.
Partner: UNT Libraries Government Documents Department

SOLID LUBRICANT COATINGS

Description: Quantitative data on some of the variables affecting the performance of solid dry-film lubricants are presented. Included is a discussion of the test background, theory, methods used, sample pre-test treatment, and variables tested. (J.R.D.)
Date: April 1, 1958
Creator: Berry, L M
Partner: UNT Libraries Government Documents Department

Investigation of temperature limitation of various lubricants for high-temperature 20-millimeter-bore ball bearings

Description: Report presenting lubrication studies of bearings lubricated with liquids and solids in a bearing test rig under conditions of minimum lubricant flow. Six liquid lubricants were investigated, including two petroleums and four synthetics. Results regarding bearings with silver-plated beryllium copper cages, bearings with cast Inconel cages, and an analysis of experimental results are provided.
Date: January 1955
Creator: Nemeth, Z. N. & Anderson, W. J.
Partner: UNT Libraries Government Documents Department

Visual studies of cylinder lubrication [part] 1: the lubrication of the piston skirt

Description: Report describes the lubrication characteristics of an aircraft-type piston as visually studied in a V-type engine with a glass cylinder. Information about the movement of the piston, the piston rings, and the oil-control rings and their effect on lubrication is included.
Date: September 1945
Creator: Shaw, Milton C. & Nussdorfer, Theodore
Partner: UNT Libraries Government Documents Department

Influence of lubricant viscosity on operating temperatures of 75-millimeter-bore cylindrical-roller bearing at high speeds

Description: Report presenting an experimental investigation of the effect of oil viscosity on bearing operation characteristics using a 75-millimeter-bore cylindrical-roller inner-race-riding cage-type bearing. Results regarding DN value, oil flow, viscosity, the combination of DN and oil flow, oil inlet temperature, and improvements to cooling correlation theory are provided.
Date: February 1952
Creator: Macks, E. Fred; Anderson, William J. & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department