The bi-Gaussian theory to understand sliding wear and friction

This paper presents wear and friction properties of carbon-carbon composites (CCC) manufactured by resin transfer molding (RTM) process. During composite fabrication thickness stitching was employed to improve inter laminar tension and shear properties. Wear and Friction characteristics of carbon-carbon composites were evaluated using pin-on-disc set up. Results of test indicate that surface of composites having stitches in a perpendicular direction show increase in wear rates with increase in load.

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Dry Sliding Wear Behavior of A356-ZrO2 Metal Matrix Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1125.116 ◽

2015 ◽

Vol 1125 ◽

pp. 116-120

Author(s):

Hamidreza Ghandvar ◽

Saeed Farahany ◽

Mohd Hasbullah Idris ◽

Mohammadreza Daroonparvar

Keyword(s):

Metal Matrix ◽

Sliding Wear ◽

Adhesive Wear ◽

Wear Behavior ◽

A356 Alloy ◽

Matrix Alloy ◽

Dry Sliding Wear ◽

Dry Sliding ◽

Friction Behavior ◽

Wear And Friction

Dry sliding wear and friction behavior of cast A356 Al-Si alloy and composite containing 5wt. % ZrO2 particles were studied by means of a pins-on-disk apparatus over loads of 5N, 20N and a sliding speed of 0.628m/s. The experimental results showed that the composites exhibited a higher wear resistance in comparison to that of the unreinforced A356 alloy. The friction coefficient of tested materials increased with increasing applied load from 5 to 20 N. FESEM investigations revealed that the wear mechanism of the A356 matrix alloy changed from sever abrasive, adhesive wear into mild abrasion and adhesive wear with addition of 5wt. % ZrO2 reinforcement particles.

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Tribological characteristics of diamond-like films deposited with an are-discharge method

Journal of Materials Research ◽

10.1557/jmr.1990.2524 ◽

1990 ◽

Vol 5 (11) ◽

pp. 2524-2530 ◽

Cited By ~ 70

Author(s):

J-P. Hirvonen ◽

R. Lappalainen ◽

J. Koskinen ◽

A. Anttila ◽

T. R. Jervis ◽

...

Keyword(s):

Sliding Wear ◽

Wear Track ◽

Carbon Film ◽

Hardened Steel ◽

Dry Sliding Wear ◽

Transfer Layer ◽

Maximum Value ◽

Wear And Friction ◽

Discharge Method

Using an are-discharge method, we deposited a diamond-like carbon film 600 nm thick on hardened steel. Characterization of the film was carried out with Raman spectroscopy. In dry sliding wear and friction tests, with a hardened steel pin as a counterpart, we obtained a friction coefficient between 10000 and 20000 cycles, with the maximum value of 0.18. The value decreased to 0.12 after about 100000 cycles. We obtained a wear coefficient of 7 × 10−17 m3/mN. A transfer layer formed on the pin during sliding and probably had the dominating effect on the tribological behavior. We observed in nanoindentation measurements that the film softened in a wear track during the first 20000 cycles. Although fracture pits on the wear track occurred, fracture is not the dominant failure mechanism of these films. Degradation of good tribological properties was caused mainly by partial wear-through of the film after 370000 cycles and by a subsequent redeposition of the transfer film on the wear track during prolonged sliding.

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