Survey of Solid Film Lubricants
Report Number: ASD-TDR-62-465 p. 113-127
Author(s): McConnell, B . D.
Corporate Author(s): Wright Air Development Division
Date of Publication: 1962-05
Pages: 15
Contract: AF 33(616)-7223
DoD Project: 3044
DoD Task: 30169
Identifier: This paper is part of a conference proceedings. See AD0278843
Abstract:
Discussion of the capabilities and availability of solid film lubricants is presented. Solid film lubricants available from commercial vendors are of the organic resin-bonded type and are temperature-limited to about 450 °F because of the organic resins. Most films contain molybdenum disulphide or graphite pigment. Results indicate these films are capable of 70 hours continuous operation at ambient temperatures, 80,000 psi load and speed to 200 ft/min.Various test devices are discussed as to capabilities, limitation, etc. Results are presented for various operating conditions.Research in high-temperature candidate films is discussed in detail. Problem areas such as binders, temperature dependency of some of the pigments, etc., are outlined. Methods and criteria for selecting possible materials as solid film lubricants are stated. Design and development of wear life testing machines for high-temperature and vacuum conditions is presented along with results of many tests conducted on these films under various conditions.Results to date indicate lead sulphide (PbS) bonded with boric oxide (B2O3) is the best solid film lubricant for use at l000°F. Comparative tests conducted on the Hohman A-6 Tester indicated a wear life of approximately 14,000 feet, at l000 °F, 100-pound load and 126 ft/min sliding speed. A conventional film on this tester gives an average wear life of approximately 40,000 feet, at 250 °F , 200-pound load and 126 ft/min sliding speed. This film suffers very low wear life at temperatures below 800 ° F. This behavior is receiving extensive investigation at the present time. Initial vacuum studies have been conducted and preliminary results are discussed.The need for a more fundamental knowledge of the mechanisms involved with these materials is pointed out. Present programs in this area are discussed briefly along with future thinking to bring the fundamental research up to that of the present developments.
Author(s): McConnell, B . D.
Corporate Author(s): Wright Air Development Division
Date of Publication: 1962-05
Pages: 15
Contract: AF 33(616)-7223
DoD Project: 3044
DoD Task: 30169
Identifier: This paper is part of a conference proceedings. See AD0278843
Abstract:
Discussion of the capabilities and availability of solid film lubricants is presented. Solid film lubricants available from commercial vendors are of the organic resin-bonded type and are temperature-limited to about 450 °F because of the organic resins. Most films contain molybdenum disulphide or graphite pigment. Results indicate these films are capable of 70 hours continuous operation at ambient temperatures, 80,000 psi load and speed to 200 ft/min.Various test devices are discussed as to capabilities, limitation, etc. Results are presented for various operating conditions.Research in high-temperature candidate films is discussed in detail. Problem areas such as binders, temperature dependency of some of the pigments, etc., are outlined. Methods and criteria for selecting possible materials as solid film lubricants are stated. Design and development of wear life testing machines for high-temperature and vacuum conditions is presented along with results of many tests conducted on these films under various conditions.Results to date indicate lead sulphide (PbS) bonded with boric oxide (B2O3) is the best solid film lubricant for use at l000°F. Comparative tests conducted on the Hohman A-6 Tester indicated a wear life of approximately 14,000 feet, at l000 °F, 100-pound load and 126 ft/min sliding speed. A conventional film on this tester gives an average wear life of approximately 40,000 feet, at 250 °F , 200-pound load and 126 ft/min sliding speed. This film suffers very low wear life at temperatures below 800 ° F. This behavior is receiving extensive investigation at the present time. Initial vacuum studies have been conducted and preliminary results are discussed.The need for a more fundamental knowledge of the mechanisms involved with these materials is pointed out. Present programs in this area are discussed briefly along with future thinking to bring the fundamental research up to that of the present developments.
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