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Research Papers: Friction & Wear

Effects of Some Solid Lubricants Suspended in Oil Toward Controlling the Wear Performance of a Cast Iron

[+] Author and Article Information
B. K. Prasad1

Advanced Materials and Processes Research Institute, CSIR, Bhopal-462026, Indiabraj_kprasad@yahoo.co.in

S. Rathod, M. S. Yadav, O. P. Modi

Advanced Materials and Processes Research Institute, CSIR, Bhopal-462026, India

1

Corresponding author.

J. Tribol 132(4), 041602 (Sep 23, 2010) (9 pages) doi:10.1115/1.4002217 History: Received December 23, 2009; Revised July 16, 2010; Published September 23, 2010; Online September 23, 2010

The present investigation deals with the examination of the sliding wear response of a gray cast iron in oil lubricated condition over a range of applied pressure. The composition of the oil lubricant was changed by adding 5.26wt% solid lubricant particles. The solid lubricants used were graphite, talc, MoS2, and lead. The observed wear response of the samples has been substantiated through the characteristics of wear surfaces, subsurface regions, and debris particles and discussed in terms of specific response of different microconstituents, such as ferrite, pearlite, and graphite present therein. Operating wear mechanisms were assessed through the observed features of wear surfaces, subsurface regions, and debris. The wear rate increased with applied pressure. The slope of the wear rate versus pressure plots was low up to a critical pressure. This was followed by a sudden rise in the slope at higher pressures irrespective of the test environment. The frictional heating was affected by pressure in a manner practically identical to that of the wear rate. The presence of graphite, MoS2, and lead in the oil led to a substantial decrease in the wear rate and severity of frictional heating. The oil plus lead lubricant mixture was observed to offer best results in terms of reduced wear rate and lower frictional heating. This was followed by the ones containing graphite and MoS2 while talc caused the wear performance of the samples to deteriorate over that of the bare oil. However, the severity of frictional heating decreased in general in the oil containing solid lubricant particles. Seizure brought about high frictional heating and wear rate.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Micrographs of (a) and (b) graphite, (c) MoS2, (d) and (e) talc, and (f) lead powder particles used as the solid lubricant in the oil lubricant mixture

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Figure 2

Microstructural features of the cast iron samples showing (a) the mode of distribution of various microconstituents and (b) occasional decohesion at the graphite/ferrite matrix interface (A: Pearlite, B: ferrite, single arrow: graphite, and double arrow: occasional decohesion at the graphite/(ferrite) matrix interface)

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Figure 3

Wear rate versus applied pressure plots of the samples tested in different environments

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Figure 4

Temperature near the specimen surface versus test duration plots tested in (a)–(d) different environments at the applied pressure of (a) 1 MPa, (b) 3 MPa, (c) 5 MPa, and (d) 7 MPa

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Figure 5

Wear surfaces of the samples tested in oil at the applied pressure of (ac) 1 MPa and (d) 7 MPa (A: graphite and arrow: microcracks)

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Figure 6

Wear surfaces of the samples tested in the oil lubricant mixture containing (a) and (b) talc and (c) and (d) MoS2 particles at the applied pressure of (a)–(c) 1 MPa and (d) 7 MPa (single arrow: sticking debris, double arrow: deep groove, and triple arrow: flow of solid lubricant phase in the sliding direction)

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Figure 7

Subsurface regions of the samples tested in the oil at the pressure of (a) 1 MPa and (b) 7 MPa (A: finest microconstituents in the nearest vicinity of wear surface, B: flow of different microconstituents in the sliding direction, C: bulk structure, single arrow: flow of graphite flake in the sliding direction, and double arrow: cracks]

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Figure 8

Debris particles of the samples tested in the oil lubricant mixture containing (a) MoS2 and (b) graphite particles (A: flake, B: machining chip, single arrow: sticking of fine debris on a coarse debris particle, and double arrow: fragmented solid lubricant (graphite) particle)

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