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Solid lubricants
SYSTEMATIC
ABSTRACTS
OF CURRENT
LITERATURE
Lubrication Eng., 23 (IO) (1967) 415-418; 4 figs., I table, IO refs. 3.3. Solid lubricants Literature References to MO% Molysulfide Newsletter*, IO (I) (1967). Articles and patents on MoSa-products that have appeared since the last issue of the Molysulfide Newsletter are listed. Is MOOS abrasive? Anon., Molysulfide
Newsletter,
IO (I) (1967)
1 P.
The abrasive properties of MOOS are compared with those of a number of solid lubricants. Testing methods ASTM D-r367 and ASTM-x404. Oxidized MoSe showed less abrasion than natural graphite or mica, but more than Molysulfide. Oxidation Data for Moss, WSs, WSes, T&s, and TaSes by Thermogravimetric Analysis. (Letter to the Editor) M. T. Lavik and G. D. Moore. Lubrication Eng., 23 (6) (1967) 224-225; 2 figs., I table, 4 refs. Additional oxidation data on solid lubricants are presented and differ from those presented by Magie (see abstract Wear, ro (1967) 74. Solid Lubricants. M. E. Campbetl, J. B. Loser and E. Sneegas, NASA SP-5059, May 1966, 115 pp. Uses of Molybdenum Disulfide in the Communications Industry. G. H. Kitchen, Lubrication Eng., 23 (5) (x967) 181-186; 7 figs. Subrnicron Boron Nitride as a Grease Thickener. II. High-sueed Bearing Tests. J. F. Ditter, R. D.Allen, H. T. ThGmas, M. Gerstein and J. B. Christian, Lubrication Ertg., 23 (8) (1967) 330-335; 6 figs., 5 tables, 5 refs. Capillary rheometry data were obtained on greases prepared from silicone, &phenylether, and perfluoro-polymer base stocks thickened with sub-micron boron nitride powder. The perfluoro-polymer grease was subiected to 10,000 r.n.m. Pope Spindle tests, with the following performance lifetimes: 2412 h at 400°F, 1265 h at 450°F, and 320 h at- 5oo’F.’ Four-ball wear ‘tests also indicated excellent wear characteristics. Lubrication with Blectrodeposited Films of Silver-Rhenium and Gold-Molybdenum. N. R. Thornton and Z.R. Wolanski, Lubrica* Published by Climax Molybdenum Company, 1270 Avenue of the Americas, New Yorkzo, N.Y. 10020, U.S.A.
309
tion Eng., 23 (7) (1967) 271~-277; x8 figs., 6 refs. The lubrication mechanisms involved in a class of electro-deposited solid film systems are defined. The Ag-Re and AU-MO solid film systems demonstrate an open structure when deposited on T-I steel. This open or porous structure is related to the deposition alloy, deposition processing, and substrate material. The alloying element and temperature also affect the lubrication. The Ag-Re and AuMO systems are discussed as to composition, structure, and substrate and their resultant effect on the boundary layer condition. The effects of environment, such as temperature, on lubrication characteristics are also discussed. An Application of Self-lubricated Composite Materials. H. Halliwell, G. L. Thomas, J. R. Ward and H. J. Skruch, Lubrication Eng., 23 (7) (1967) 278-287; 13 figs., 3 tables, 3 refs. In a continuing program to exploit the unusual properties and potential advantages of solid composite lubricants, a sleeve-type seal based on reinforced polytetrafluoroethylene was developed as a piston seal for highpxessure air compressors. The status of the material development for maximizing the effectiveness and life of this seal is reported. Specifically considered is the use of an organized, metallic, filament-winding technique to provide a superior reinforcing matrix as compared to the randomIy dispersed particles and fibers used heretofore. New approaches to combinations of composites for this and other applications, have been uncovered. It is possible to expect reliable compressor operation at 5000 6.s.i. using such seals in lieu of conventional split ringsfor periods beyond IOOOh with very low rates of wear and air leakage. Development of Polyimide-bonded Solid Lubricants. M. Campbell and V. Hopkins, L~b~~cat~o~ Elag., 23 (7) (r967) 288-294; 7 figs., 3 tables, 7 refs. Results of work conducted to develop two heat-resistant, organically-bonded solid-film lubricants are summarized herein. These solid-film lubricants are composed of molybdenum disulfide, antimony trioxide, and thermosetting polyimide resins. The approach taken to develop these films is presented. Procedures followed to mix, apply, and cure these films are outlined. Equipment used to test solid-film lubricants is described and the test procedures followed are given. Wear-lives obtained for the polyimide-bonded films are presented and compared to those obtained for two inorganically bonded films, MLF-3 and MLF-9, at temperatures to Wear, rr (1968)
ABSTRACTS
OF CURRENT
LITERATURE
Lubrication Eng., 23 (IO) (1967) 415-418; 4 figs., I table, IO refs. 3.3. Solid lubricants Literature References to MO% Molysulfide Newsletter*, IO (I) (1967). Articles and patents on MoSa-products that have appeared since the last issue of the Molysulfide Newsletter are listed. Is MOOS abrasive? Anon., Molysulfide
Newsletter,
IO (I) (1967)
1 P.
The abrasive properties of MOOS are compared with those of a number of solid lubricants. Testing methods ASTM D-r367 and ASTM-x404. Oxidized MoSe showed less abrasion than natural graphite or mica, but more than Molysulfide. Oxidation Data for Moss, WSs, WSes, T&s, and TaSes by Thermogravimetric Analysis. (Letter to the Editor) M. T. Lavik and G. D. Moore. Lubrication Eng., 23 (6) (1967) 224-225; 2 figs., I table, 4 refs. Additional oxidation data on solid lubricants are presented and differ from those presented by Magie (see abstract Wear, ro (1967) 74. Solid Lubricants. M. E. Campbetl, J. B. Loser and E. Sneegas, NASA SP-5059, May 1966, 115 pp. Uses of Molybdenum Disulfide in the Communications Industry. G. H. Kitchen, Lubrication Eng., 23 (5) (x967) 181-186; 7 figs. Subrnicron Boron Nitride as a Grease Thickener. II. High-sueed Bearing Tests. J. F. Ditter, R. D.Allen, H. T. ThGmas, M. Gerstein and J. B. Christian, Lubrication Ertg., 23 (8) (1967) 330-335; 6 figs., 5 tables, 5 refs. Capillary rheometry data were obtained on greases prepared from silicone, &phenylether, and perfluoro-polymer base stocks thickened with sub-micron boron nitride powder. The perfluoro-polymer grease was subiected to 10,000 r.n.m. Pope Spindle tests, with the following performance lifetimes: 2412 h at 400°F, 1265 h at 450°F, and 320 h at- 5oo’F.’ Four-ball wear ‘tests also indicated excellent wear characteristics. Lubrication with Blectrodeposited Films of Silver-Rhenium and Gold-Molybdenum. N. R. Thornton and Z.R. Wolanski, Lubrica* Published by Climax Molybdenum Company, 1270 Avenue of the Americas, New Yorkzo, N.Y. 10020, U.S.A.
309
tion Eng., 23 (7) (1967) 271~-277; x8 figs., 6 refs. The lubrication mechanisms involved in a class of electro-deposited solid film systems are defined. The Ag-Re and AU-MO solid film systems demonstrate an open structure when deposited on T-I steel. This open or porous structure is related to the deposition alloy, deposition processing, and substrate material. The alloying element and temperature also affect the lubrication. The Ag-Re and AuMO systems are discussed as to composition, structure, and substrate and their resultant effect on the boundary layer condition. The effects of environment, such as temperature, on lubrication characteristics are also discussed. An Application of Self-lubricated Composite Materials. H. Halliwell, G. L. Thomas, J. R. Ward and H. J. Skruch, Lubrication Eng., 23 (7) (1967) 278-287; 13 figs., 3 tables, 3 refs. In a continuing program to exploit the unusual properties and potential advantages of solid composite lubricants, a sleeve-type seal based on reinforced polytetrafluoroethylene was developed as a piston seal for highpxessure air compressors. The status of the material development for maximizing the effectiveness and life of this seal is reported. Specifically considered is the use of an organized, metallic, filament-winding technique to provide a superior reinforcing matrix as compared to the randomIy dispersed particles and fibers used heretofore. New approaches to combinations of composites for this and other applications, have been uncovered. It is possible to expect reliable compressor operation at 5000 6.s.i. using such seals in lieu of conventional split ringsfor periods beyond IOOOh with very low rates of wear and air leakage. Development of Polyimide-bonded Solid Lubricants. M. Campbell and V. Hopkins, L~b~~cat~o~ Elag., 23 (7) (r967) 288-294; 7 figs., 3 tables, 7 refs. Results of work conducted to develop two heat-resistant, organically-bonded solid-film lubricants are summarized herein. These solid-film lubricants are composed of molybdenum disulfide, antimony trioxide, and thermosetting polyimide resins. The approach taken to develop these films is presented. Procedures followed to mix, apply, and cure these films are outlined. Equipment used to test solid-film lubricants is described and the test procedures followed are given. Wear-lives obtained for the polyimide-bonded films are presented and compared to those obtained for two inorganically bonded films, MLF-3 and MLF-9, at temperatures to Wear, rr (1968)