Friction Films and Their Influence on the Antifriction Properties of New High-Temperature Nickel Composites

2021 ◽  
pp. 601-611
Author(s):  
Krzysztof Jamroziak ◽  
Tetiana Roik
Keyword(s):  
High Temperature ◽  
Antifriction Properties ◽  
Nickel Composites

scholarly journals Friction surface modifiers of carbon-containing material for high-temperature operation

2021 ◽  
Vol 2124 (1) ◽  
pp. 012013
Author(s):  
M N Roshchin
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Friction Coefficient ◽  
Friction Surface ◽  
Atmospheric Conditions ◽  
Temperature Range ◽  
Tribological Tests ◽  
Surface Modifiers ◽  
Antifriction Properties ◽  
High Temperature Operation

Abstract The results of high-temperature tribological tests of carbon-containing material in friction on heat-resistant stainless steel 40X13 in the temperature range from 20 to 700 °C under atmospheric conditions are presented. Friction surface modifiers “Argolon-2D” material improve antifriction properties and decrease friction coefficient value. Friction coefficient when using Ni-Se-PTFE modifier at load of 0.67 MPa and speed of 0.16 m/s is less by 5% than at speed of 0.05 m/s, and at speed of 0.25 m/s friction coefficient is less by 13% than at speed of 0.05 m/s. At 500 °C and a load of 0.67 MPa the friction coefficient when using Ni-Se-PTFE modifier is 30% higher than when using InSb-PTFE modifier, and the friction coefficient when using CuO-PTFE modifier is 1.2 times higher than when using InSb-PTFE modifier.

One-Step Synthesis and Densification of Bulk YBa2Cu4O8/Ni Composite Superconductors

1989 ◽  
Vol 169 ◽  
Author(s):  
C. Gélinas ◽  
B. Champagne
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Oxygen Stoichiometry ◽  
Metal Composite ◽  
Consolidation Process ◽  
High Oxygen Pressure ◽  
Composite Superconductors ◽  
One Step ◽  
Stable Oxygen ◽  
Nickel Composites

The fabrication of bulk YBa2Cu307-x/metal composite superconductors is not easy because of the oxygen-temperature dependence of the YBa2Cu307-x phase (the socalled 123 phase). A loss of oxygen occurs during consolidation of these composites at high temperature and it is almost impossible to diffuse oxygen through the metallic envelope into the densified compound to restore the required oxygen content for superconductivity above 77K. To overcome this drawback, a one-step synthesis and consolidation process was used to produce YBa2Cu4O8/ nickel composites. The superconductive 124 phase has a more stable oxygen stoichiometry [1] and is synthesized under a high oxygen pressure at high temperature.

High-temperature antifriction properties of Ti1-xNbxC0�5N0�5 alloys

1984 ◽  
Vol 23 (8) ◽  
pp. 645-648
Author(s):  
Yu. G. Tkachenko ◽  
S. S. Ordan'yan ◽  
V. K. Yulyugin ◽  
D. Z. Yurchenko ◽  
I. B. Panteleev ◽  
...  
Keyword(s):  
High Temperature ◽  
Antifriction Properties

High-temperature mechanical properties of zirconia/nickel composites

2003 ◽  
Vol 23 (15) ◽  
pp. 2849-2856 ◽  
Author(s):  
A. Morales-Rodrı́guez ◽  
A. Bravo-León ◽  
A. Domı́nguez-Rodrı́guez ◽  
S. López-Esteban ◽  
J.S. Moya ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperature Mechanical Properties ◽  
Nickel Composites

High-temperature friction units with carbon-containing materials

2021 ◽  
pp. 42-44
Author(s):  
M.N. Roshchin
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Contact Pressure ◽  
High Temperatures ◽  
Carbon Composites ◽  
Friction Contact ◽  
2D Material ◽  
Friction Units ◽  
Antifriction Properties ◽  
Frictional Interaction

The frictional interaction of carbon-carbon composites with steel at high temperatures is considered. Antifriction properties of carbon composites are investigated at friction on a steel at speeds of 0,050,25 m/s and pressures of 0,31,0 MPa. The advantages of Hardcarb-T material in comparison with Argalon-2D material are experimentally determined. Keywords: temperature, friction, contact pressure, composites, steel, speed, friction coefficient. [email protected]

Electrodeposited Cobalt-Tungsten as a High-Temperature Diffusion Barrier for Graphite-Fiber/Nickel Composites

1993 ◽  
Vol 318 ◽  
Author(s):  
N. S. Wheeler ◽  
D. S. Lashmore
Keyword(s):  
High Temperature ◽  
Diffusion Barrier ◽  
Alloy Coating ◽  
Matrix Composites ◽  
Graphite Fiber ◽  
Nickel Metal ◽  
Aerospace Applications ◽  
Temperature Diffusion ◽  
Graphite Fibers ◽  
Nickel Composites

ABSTRACTThere is a growing demand for advanced composites which can maintain their structural strength in high-temperature environments, particularly for aerospace applications. The use of graphite fiber/nickel metal matrix composites would be desirable if the deterioration of mechanical properties resulting from interdiffusion of carbon and nickel at temperatures in excess of 600°C could be avoided. The present research concerns an electrodeposited cobalt alloy coating containing 5-10.5 at-% tungsten, which was designed to serve as a diffusion barrier between graphite fibers and a nickel matrix. The resulting graphite/Co-W/Ni composite was tested under various time/temperature conditions, and the coating was shown to inhibit diffusion for up to 24 hr at 800°C. Annealed and unannealed coated fibers were analyzed by x-ray diffraction and by transmission electron microscopy The as-deposited coating was found to contain both h.c.p. and f.c.c. cobalt, whereas only f.c.c. was observed after annealing at 1100°C for 1.5 hours. WC was found at the coating/fiber interface.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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