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Evaluation Of Advanced Solid Lubricant Coatings For Foil Air Bearings Operating At 25 And 500 C
Download Evaluation Of Advanced Solid Lubricant Coatings For Foil Air Bearings Operating At 25 And 500 C full books in PDF, epub, and Kindle. Read online Evaluation Of Advanced Solid Lubricant Coatings For Foil Air Bearings Operating At 25 And 500 C ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Evaluation of Advanced Solid Lubricant Coatings for Foil Air Bearings Operating at 25 and 500 C by : Christopher DellaCorte
Download or read book Evaluation of Advanced Solid Lubricant Coatings for Foil Air Bearings Operating at 25 and 500 C written by Christopher DellaCorte and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis EVALUATION OF ADVANCED SOLID LUBRICANT COATINGS FOR FOIL AIR BEARINGS OPERATING AT 25 AND 500 C... NASA/TM-1998-206619... SEP. 15, 1998 by : United States. National Aeronautics and Space Administration
Download or read book EVALUATION OF ADVANCED SOLID LUBRICANT COATINGS FOR FOIL AIR BEARINGS OPERATING AT 25 AND 500 C... NASA/TM-1998-206619... SEP. 15, 1998 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance and Durability of High Temperature Foil Air Bearings for Oil-Free Turbomachinery by : C. DellaCorte
Download or read book Performance and Durability of High Temperature Foil Air Bearings for Oil-Free Turbomachinery written by C. DellaCorte and published by . This book was released on 2000 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 deg C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS 304, is applied to the shaft by plasma spraying. PS304 is a NiCr based Cr2O3 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is a linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS 304 coating are well suited for advanced high temperature, oil-free turbomachinery applications.
Book Synopsis The Effect of Journal Roughness and Foil Coatings on the Performance of Heavily Loaded Foil Air Bearings by :
Download or read book The Effect of Journal Roughness and Foil Coatings on the Performance of Heavily Loaded Foil Air Bearings written by and published by . This book was released on 2001 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foil air bearing load capacity tests were conducted to investigate if a solid lubricant coating applied to the surface of the bearing's top foil can function as a break-in coating. Two foil coating materials, a conventional soft polymer film (polyimide) and a hard ceramic (alumina), were independently evaluated against as-ground and worn (run-in) journals coated with NASA PS304, a high-temperature solid lubricant composite coating. The foil coatings were evaluated at journal rotational speeds of 30000 rpm and at 25 deg C. Tests were also performed on a foil bearing with a bare (uncoated) nickel-based superalloy top foil to establish a baseline for comparison. The test results indicate that the presence of a top foil solid lubricant coating is effective at increasing the load capacity performance of the foil bearing. Compared to the uncoated baseline, the addition of the soft polymer coating on the top foil increased the bearing load coefficient by 120 percent when operating against an as-ground journal surface and 85 percent against a run-in journal surface. The alumina coating increased the load coefficient by 40 percent against the as-ground journal but did not have any affect when the bearing was operated with the run-in journal. The results suggest that the addition of solid lubricant films provide added lubrication when the air film is marginal indicating that as the load capacity is approached foil air bearings transition from hydrodynamic to mixed and boundary lubrication.
Book Synopsis 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites - A, Volume 24, Issue 3 by : Waltraud M. Kriven
Download or read book 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites - A, Volume 24, Issue 3 written by Waltraud M. Kriven and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
Book Synopsis A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery by :
Download or read book A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery written by and published by . This book was released on 2002 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Processing Techniques and Tribological Behavior of Composite Materials by : Tyagi, Rajnesh
Download or read book Processing Techniques and Tribological Behavior of Composite Materials written by Tyagi, Rajnesh and published by IGI Global. This book was released on 2015-01-31 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: An understanding of friction and wear behavior of materials is crucial in order to improve their performance and durability. New research is providing the opportunity to solve common problems relating to the development of materials, surface modification, coatings, and processing methods across industries. Processing Techniques and Tribological Behavior of Composite Materials provides relevant theoretical frameworks and the latest empirical research findings on the strategic role of composite tribology in a variety of settings. This book is intended for students, researchers, academicians, and professionals working in industries where wear reduction and performance enhancement of machines and machine elements is essential to success.
Book Synopsis Advances in Rheology of Materials by : Ashim Dutta
Download or read book Advances in Rheology of Materials written by Ashim Dutta and published by BoD – Books on Demand. This book was released on 2023-05-31 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: In modern times, rheology has emerged as a powerful tool for materials scientists to explore the properties of soft matter or complex fluids, including such diverse materials as food, cosmetics, polymers, lubricants, drilling fluids and biological systems. Rheology parameters such as shear modulus (G’), storage modulus (G”) and viscosity (η), together with microscopic imaging, provide considerable insight into the structure-property relationship in these materials. This in turn helps design materials with properties tailored to multiple applications. This book is a compilation of works by experts in their respective areas of specialization and covers a wide range of applications. The book will be useful both to experts in this area of research and to newcomers from a range of specializations.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721194568 Total Pages :34 pages Book Rating :4.1/5 (945 download)
Book Synopsis Performance and Durability of High Temperature Foil Air Bearing for Oil-Free Turbomachinery by : National Aeronautics and Space Administration (NASA)
Download or read book Performance and Durability of High Temperature Foil Air Bearing for Oil-Free Turbomachinery written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS304, is applied to the shaft by plasma spraying. PS304, is a NiCr based Cr2O3 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is a linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS304 coating are well suited for advanced high temperature, oil-free turbomachinery applications. DellaCorte, C. and Valco, M. J. and Radil, K. C. and Heshmat, H. Glenn Research Center NASA/TM-1999-209187, NAS 1.15:209187, E-11697
Download or read book Journal of Tribology written by and published by . This book was released on 2004 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721530519 Total Pages :34 pages Book Rating :4.5/5 (35 download)
Book Synopsis A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery by : National Aeronautics and Space Administration (NASA)
Download or read book A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foil air bearings are self-acting hydrodynamic bearings which rely upon solid lubricants to reduce friction and minimize wear during sliding which occurs at start-up and shut-down when surface speeds are too low to allow the formation of a hydrodynamic air film. This solid lubrication is typically accomplished by coating the non-moving foil surface with a thin, soft polymeric film. The following paper introduces a systems approach in which the solid lubrication is provided by a combination of self lubricating shaft coatings coupled with various wear resistant and lubricating foil coatings. The use of multiple materials, each providing different functions is modeled after oil-lubricated hydrodynamic sleeve bearing technology which utilizes various coatings and surface treatments in conjunction with oil lubricants to achieve optimum performance. In this study, room temperature load capacity tests are performed on journal foil air bearings operating at 14,000 rpm. Different shaft and foil coating technologies such as plasma sprayed composites, ceramic, polymer and inorganic lubricant coatings are evaluated as foil bearing lubricants. The results indicate that bearing performance is improved through the individual use of the lubricants and treatments tested. Further, combining several solid lubricants together yielded synergistically better results than any material alone. DellaCorte, Christopher and Zaldana, Antonio R. and Radil, Kevin C. Glenn Research Center NASA/TM-2002-211482, NAS 1.15:211482, E-13250, ARL-TR-2867
Book Synopsis The effect of journal roughness and foil coatings... by :
Download or read book The effect of journal roughness and foil coatings... written by and published by DIANE Publishing. This book was released on with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 27th International Cocoa Beach Conference on Advanced Ceramics and Composites by :
Download or read book 27th International Cocoa Beach Conference on Advanced Ceramics and Composites written by and published by . This book was released on 2003 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721641321 Total Pages :32 pages Book Rating :4.6/5 (413 download)
Book Synopsis Friction and Wear Characteristics of Cu-4Al Foil Bearing Coating at 25 and 650 Degree C by : National Aeronautics and Space Administration (NASA)
Download or read book Friction and Wear Characteristics of Cu-4Al Foil Bearing Coating at 25 and 650 Degree C written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The friction and wear performance of a Cu-4Al top foil coating has been investigated in Generation I foil air bearings. The copper alloy was applied by a novel deposition technique (ion diffusion) and the journal was coated with PS304, a plasma spray deposited high temperature composite solid lubricant coating. The ion diffusion coating process deposits a desirable smooth layer compared to other methods like cathodic arc deposition. The tribological performance of bearings with and without Cu-4Al foil coatings were evaluated through start-stop tests on an air bearing test rig at 25 and 650 C. The results indicate that the Cu-4Al assists during the initial break-in period, gives more stable friction performance with respect to temperature, and appears to prevent top foil wear at high temperature. The measured load capacity coefficient was 0.5, which was comparable to earlier testing of more advanced design Generation III bearings coated with standard cathodic arc deposited Cu-4Al. However, further studies are needed to determine if deeper penetration of the copper alloy into the foil would help make the transition in friction behavior from contact with the Cu-4Al coated foil to contact with the base foil material more gradual. Also, future work is recommended to assess the performance of ion diffusion coatings with different Cu-based alloy compositions and to investigate the effect the coating has on the elastic modulus of the foil material. Stanford, Malcolm K. and DellaCorte, Christopher Glenn Research Center NASA/TM-2004-212972, NAS 1.15:212972, E-14445
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 2000 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Evaluation of a Modified Chrome Oxide Based High Temperature Solid Lubricant Coating for Foil Gas Bearings by :
Download or read book The Evaluation of a Modified Chrome Oxide Based High Temperature Solid Lubricant Coating for Foil Gas Bearings written by and published by . This book was released on 1998 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance and Durability of High Temperature Foil Air Bearings for Oil-free Turbomachinery by :
Download or read book Performance and Durability of High Temperature Foil Air Bearings for Oil-free Turbomachinery written by and published by . This book was released on 1999 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance and durability of advanced high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650°C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS304, is applied to the shaft by plasma spraying. PS304 is a NiCr based Cr203 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS304 coating are well suited for advanced high temperature, oil-free turbomachinery applications.
