Tribochemistry and Wear Life Improvement in Liquid-Lubricated H-DLC-Coated Bearings

Transcription

1 AEROSPACE REPORT NO. TR-27(8565)-2 Tribochemistry and Wear Life mprovement in Liquid-Lubricated H-DLC-Coated Bearings 25 July 27 Prepared by J. R. LNCE, H.. KM, and P. A. BERTRAND Space Materials Laboratory Laboratory Operations. L. ERYLMAZ and A. ERDEMR Argonne National Laboratory Argonne, L 6439 Prepared for SPACE AND MSSLE SYSTEMS CENTER AR FORCE SPACE COMMAND 483 N. Aviation Blvd. El Segundo, CA Engineering and Technology Group 11C -P* A** APPROVED FOR PUBLC RELEASE; DSTRBUTON UNLMTED El Se un o Caior i

2 This report was submitted by The Aerospace Corporation, El Segundo, CA , under Contract No. FA882-4-C-1 with the Space and Missile Systems Center, 483 N. Aviation Blvd., El Segundo, CA t was reviewed and approved for The Aerospace Corporation by G. F. Hawkins, Principal Director, Space Materials Laboratory; and D. C. Marvin, Principal Director, Research and Program Development Office. Michael Zambrana was the project officer for the Mission-Oriented nvestigation and Experimentation (MOLE) program. This report has been reviewed by the Public Affairs Office (PAS) and is releasable to the National Technical nformation Service (NTS). At NTS, it will be available to the general public, including foreign nationals. This technical report has been reviewed and is approved for publication. Publication of this report does not constitute Air Force approval of the report's findings or conclusions. t is published only for the exchange and stimulation of ideas. 'Mchael Zambrana SMC/EA

3 Form Approved REPORT DOCUMENTATON PAGE OMB No Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaning the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection Reports (74-188), of information, 1215 including Jefferson suggestions Davis Highway, for reducing Suite this 124, burden Arlint, to Department VA , of Defense, Respondents Washington should Headquarters be aware that Services, notwithstandin Directorate any for nformation other "ov*onof Operations law, and opro shall be subject to ar~ny pnty for failing to comply with a collecton of infor'ton if it does not display a currently valid OMB control number. PLUE.ASE9ONT RETURNYOUR FOM TOTHE ABOVE AD ESS. i. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 3. DATES COVERED (From. To) TTLE AND SUBTTLE 5a. CONTRACT NUMBER FA882-4-C- i Tribochemistry and Wear Life mprovement 5b. GRANT NUMBER in Liquid-Lubricated H-DLC-Coated Bearings 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 6d. PROJECT NUMBER J. R. Lince, H.. Kim, P. A. Bertrand,. L., Eryilmaz, and A. Erdemir Se. TASK NUMBER 5f. WORK UNT NUMBER 7. PERFORMNG ORGANZATON NAME(S) AND ADDRESS(ES) 8. PERFORMNG ORGANZATON REPORT NUMBER The Aerospace Corporation Laboratory Operations El Segundo, CA TR-27(8565)-2 9. SPONSORNG MONTORNG AGENCY NAME(S) AND ADDRESS(ES) 1. SPONSOR/MONTOR'S ACRONYM(S) Space and Missile Systems Center SMC Air Force Space Command 483 N. Aviation Blvd. 11. SPONSOR/MONTOR'S REPORT El Segundo, CA 9245 NUMBER(S) 12. DSTRBUTON/AVALABLTY STATEMENT Approved for public release; distribution unlimited. 13. SUPPLEMENTARY NOTES 14. ABSTRACT n contrast to typical DLC coatings, hydrogenated DLC (H-DLC) coatings exhibit extremely low friction in vacuum and dry atmospheres, suggesting their potential importance for spacecraft applications. We have conducted a study of H-DLCcoated steel thrust bearings, lubricated with a multiply-alkylated cyclopentane oil, either unformulated, or formulated with lead naphthenate or an aryl phosphate ester mixture. Data on uncoated steel thrust bearings were obtained for comparison. The surface chemistry of the additives on worn H-DLC surfaces was evaluated along with chemical analysis of the residual lubricant. n contrast with results on uncoated steel bearings, minimal additive-based tribofilm formation was detected on the surfaces of the H-DLC coatings in the wear tracks. The results indicate that additives optimized for steels may not be appropriate for H-DLC coatings. Although there were indications that H-DLC coatings increase endurance, the high 3 roughness of the bearings contributed to statistical uncertainty. Future studies are planned with higher quality bearings. fl 15. SUBJECT TERMS Diamond-like carbon, Spacecraft lubrication, Ball bearings, Tribochemistry, Lubricant additives, Friction and wear testing 16. SECURTY CLASSFCATON OF: 17. LMTATON 18. NUMBER 19a. NAME OF OF ABSTRACT OF PAGES RESPONSBLE PERSON Jeffry Lince a. REPORT b. ABSTRACT c. THS PAGE 19b. TELEPHONE NUMBER UNCLASSFED UNCLASSFED UNCLASSFED 15 (include area code) (31) Standard Form 298 (Rev. 8-98) Prescribed by ANS Std

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31 LABORATORY OPERATONS The Aerospace Corporation functions as an "architect-engineer" for national security programs, specializing in advanced military space systems. The Corporation's Laboratory Operations supports the effective and timely development and operation of national security systems through scientific research and the application of advanced technology. Vital to the success of the Corporation is the technical staff s wide-ranging expertise and its ability to stay abreast of new technological developments and program support issues associated with rapidly evolving space systems. Contributing capabilities are provided by these individual organizations: Electronics and Photonics Laboratory: Microelectronics, VLS reliability, failure analysis, solid-state device physics, compound semiconductors, radiation effects, infrared and CCD detector devices, data storage and display technologies; lasers and electro-optics, solid-state laser design, micro-optics, optical communications, and fiber-optic sensors; atomic frequency standards, applied laser spectroscopy, laser chemistry, atmospheric propagation and beam control, LDAR/LADAR remote sensing; solar cell and array testing and evaluation, battery electrochemistry, battery testing and evaluation. Space Materials Laboratory: Evaluation and characterizations of new materials and processing techniques: metals, alloys, ceramics, polymers, thin films, and composites; development of advanced deposition processes; nondestructive evaluation, component failure analysis and reliability; structural mechanics, fracture mechanics, and stress corrosion; analysis and evaluation of materials at cryogenic and elevated temperatures; launch vehicle fluid mechanics, heat transfer and flight dynamics; aerothermodynamics; chemical and electric propulsion; environmental chemistry; combustion processes; space environment effects on materials, hardening and vulnerability assessment; contamination, thermal and structural control; lubrication and surface phenomena. Microelectromechanical systems (MEMS) for space applications; laser micromachining; laser-surface physical and chemical interactions; micropropulsion; micro- and nanosatellite mission analysis; intelligent microinstruments for monitoring space and launch system environments. Space Science Applications Laboratory: Magnetospheric, auroral and cosmic-ray physics, wave-particle interactions, magnetospheric plasma waves; atmospheric and ionospheric physics, density and composition of the upper atmosphere, remote sensing using atmospheric radiation; solar physics, infrared astronomy, infrared signature analysis; infrared surveillance, imaging and remote sensing; multispectral and hyperspectral sensor development; data analysis and algorithm development; applications of multispectral and hyperspectral imagery to defense, civil space, commercial, and environmental missions; effects of solar activity, magnetic storms and nuclear explosions on the Earth's atmosphere, ionosphere and magnetosphere; effects of electromagnetic and particulate radiations on space systems; space instrumentation, design, fabrication and test; environmental chemistry, trace detection; atmospheric chemical reactions, atmospheric optics, light scattering, state-specific chemical reactions, and radiative signatures of missile plumes.

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