High Temperature Self-lubricating Coatings for Air Lubricated Foil Bearings for the Automotive Gas Turbine Engine PDF Download

Author: Bharat Bhushan
Publisher:
ISBN:
Category : Automotive gas turbines
Languages : en
Pages : 240

View

Book Description

Author: C. DellaCorte
Publisher:
ISBN:
Category : Nickel alloys
Languages : en
Pages : 22

View

Book Description
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.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1342

View

Book Description

Author: Bharat Bhushan
Publisher: Springer Science & Business Media
ISBN: 1468403354
Category : Technology & Engineering
Languages : en
Pages : 1035

View

Book Description
Magnetic recording is presently a $50 billion industry. It spans audio, video, and digi tal applications in the form of tapes and disks. The industry is expected to grow by a factor of five or more in the next decade. This growth will be accompanied by dramatic improvements in the technology, and the potential exists for magnetic-recording den sities to improve by at least one order of magnitude! Magnetic-recording process is accomplished by relative motion between a mag netic head and a magnetic medium. Types of magnetic media for digital recording are: flexible media (tapes and floppy disks) and rigid disks. Physical contact between head and medium occurs during starts and stops and hydrodynamic air film develops at high speeds. Hying heights (mean separation between head and medium) are on the order of 0. 1 micrometer comparable to surface roughness of the mating members. Need for higher and higher recording densities requires that surfaces be as smooth as possible and flying heights be as low as possible. Smoother surfaces lead to increased static/ kinetic friction and wear. In the case of magnetic tapes, in order to have high bit capac ity for a given size of a spool, we like to use as thin a tape substrate as possible. Thinner tapes are prone to local or bulk viscoelastic deformation during storage. This may lead to variations in head-tape separations resulting in problems in data reliability.

Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 360

View

Book Description

Author: Bharat Bhushan
Publisher: John Wiley & Sons
ISBN: 9780471594079
Category : Technology & Engineering
Languages : en
Pages : 1044

View

Book Description
A current and comprehensive treatment of tribology theory andapplications A solid understanding of tribology is essential for engineers inmany fields working to design and ensure the reliability of machineparts and systems. Principles and Applications of Tribology is thefirst truly broad-based book on this vital subject. Moving frombasic theory to practice, it examines tribology from the integratedviewpoint of mechanical engineering, mechanics, and materialsscience. It offers detailed coverage of the mechanisms of materialwear, friction, and all of the major lubrication techniques--liquids, solids, and gases-- and examines a wide range of bothtraditional and state-of-the-art applications. Based on the author's extensive research and teaching experience inthe areas of tribology, mechanics, and materials science for morethan thirty years, this book emphasizes a contemporary knowledge oftribology that includes the emerging field of micro/nanotribologyand various industrial applications, including cutting-edge topicssuch as magnetic information storage devices andmicroelectromechanical systems. Principles and Applications of Tribology is invaluable formechanical, chemical, and materials engineers involved in productand process design, as well as graduate students and researchers inthese areas.

Author: William B. Harding
Publisher: ASTM International
ISBN: 0803109474
Category : Aluminum alloys
Languages : en
Pages : 384

View

Book Description
Coatings are tested to confirm compliance with specifications, to monitor the operation of a coating process, and to evaluate coatings for various services. The ability of a coating to perform as intended usually depends on several characteristics, and the testing of a coating usually involves several different tests. At first glance the nature of a characteristic that is being tested may seem clear and the results of a test may seem to be unambiguous, however, the nature of a characteristic my be more complex than realized and the ability of a test to measure the characteristic may be less than expected. The members of the ASTM Committee B-8 on Metallic and Inorganic Coatings felt it was desirable to organize a symposium on the testing of the metallic and inorganic coatings so as to bring these problems to the attention of practitioners. This publication is based on the symposium, which was presented in Chicago on April 14 and 15, 1986.

Author: Bharat Bhushan
Publisher: McGraw-Hill Companies
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 1172

View

Book Description

Author: Christopher DellaCorte
Publisher:
ISBN:
Category :
Languages : en
Pages : 18

View

Book Description

Author: Mechanical Technology Incorporated
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 148

View

Book Description