Friction and Wear Characteristics of Polyimide and Filled Polyimide Compositions in Vacuum (101̄0 Mm Hg) PDF Download
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Author: Donald H. Buckley
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 20
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Book Description
Author: Donald H. Buckley
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 20
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
The friction and wear characteristics of polyimide and filled polyimide compositions were examined in a vacuum environment (10(exp -10) mm Hg). Copper-filled (to 50 weight percent) compositions as well as graphite- and molybdenum-disulfide-filled compositions were studied. The results of the investigation indicate that, to obtain effective lubrication (low friction and wear), a transfer of the polyimide film to the mating surface must be achieved. In its absence, high friction occurred with all polyimide materials. With copper addition, a minimum in wear rate was obtained at 30 weight percent copper. Both friction and wear increased with the addition of graphite as a filler to the polyimide. With the addition of molybdenum disulfide, marked decreases in both friction and wear occurred.
Author: Donald H. Buckley
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 40
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Book Description
Author: Donald H. Buckley
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 0
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Book Description
![Friction and Wear Characteristics of Polymide and Filled Polymide Compositions in Vacuum (10[hoch-10] Mm Hg) PDF](https://books.google.com/books/content/images/frontcover/0YzHtgAACAAJ?fife=w80-h100)
Author: Donald H. Buckley
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Book Description
Author: William R. Jones (Jr.)
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 28
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Book Description
Sliding friction and wear tests of polyimide, pyrrone, and poly/amide-imide/ resin seals on steel rotating disks at 260 C in dry air for hydraulic actuator boundary lubrication.
Author: V. A. Bely
Publisher: Elsevier
ISBN: 1483152057
Category : Technology & Engineering
Languages : en
Pages : 426
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Book Description
Friction and Wear in Polymer-Based Materials discusses friction and wear problems in polymer-based materials. The book is organized into three parts. The chapters in Part I cover the basic laws of friction and wear in polymer-based materials. Topics covered include frictional interaction during metal-polymer contact and the influence of operating conditions on wear in polymers. The chapters in Part II discuss the structure and frictional properties of polymer-based materials; the mechanism of frictional transfer when a polymer comes into contact with polymers, metals, and other materials; and controlling the frictional properties of polymer materials. Part III is devoted to applications of polymer-based materials in friction assemblies. It covers composite self-lubricating materials and polymer materials for complexly loaded main friction assemblies. This work may prove useful to specialists interested in the problems of using polymer materials. It also aims to stimulate deeper research into the field of friction and wear in polymer-based materials.
![Friction, Wear, and Decomposition Mechanisms for Various Polymer Compositions in Vacuum to 10[hoch-9] Millimeter of Mercury PDF](https://books.google.com/books/content/images/frontcover/7xinMQEACAAJ?fife=w80-h100)
Author: Donald H. Buckley
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: G.M. Bartenev
Publisher: Elsevier
ISBN: 008087570X
Category : Technology & Engineering
Languages : en
Pages : 339
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Book Description
Friction and Wear of Polymers
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725057319
Category :
Languages : en
Pages : 32
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Book Description
The first part of this paper describes an ultrahigh vacuum friction apparatus (tribometer). The tribometer can be used in a ball-on-disk configuration and is specifically designed to measure the friction and endurance life of solid lubricating films such as MoS(x) in vacuum at a pressure of 10 exp -7 Pa. The sliding mode is typically unidirectional at a constant rotating speed. The second part of this paper presents some representative friction and endurance life data for magnetron sputtered MoS(x) films (110 nm thick) deposited on sputter-cleaned 440 C stainless-steel disk substrates, which were slid against a 6-mm-diameter 440 C stainless-steel bearing ball. All experiments were conducted with loads of 0.49 to 3.6 N (average Hertzian contact pressure, 0.33 to 0.69 GPa), at a constant rotating speed of 120 rpm (sliding velocity ranging from 31 to 107 mm/s due to the range of wear track radii involved in the experiments), in a vacuum of 7 x 10 exp -7 Pa and at room temperature. The results indicate that there are similarities in friction behavior of MoS(x) films overs their life cycles regardless of load applied. The coefficient of friction (mu) decreases as load W increases according to mu = kW exp -1/3. The endurance life E of MoS(x) films decreases as the load W increases according to E = KW exp -1.4 for the load range. The load- (or contract-pressure-) dependent endurance life allows us to reduce the time for wear experiments and to accelerate endurance life testing of MoS(x) films. For the magnetron-sputtered MoS(x) films deposited on 440 C stainless-steel disks: the specific wear rate normalized to the load and the number of revolutions was 3 x 10 exp -8 mm exp 3/N-revolution; the specific wear rate normalized to the load and the total sliding distance was 8 x 10 exp -7 mm exp 3/N-m; and the nondimensional wear coefficient of was approximately 5 x 10 exp -6. The values are almost independent of load in the range 0.49 to 3.6 N (average Hertzian contact pressure...
