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Research Papers: Coatings and Solid Lubricants

Effect of Hybridizing and Optimization of TiC on the Tribological Behavior of Mg–MoS2 Composites

[+] Author and Article Information
P. Narayanasamy

Assistant Professor
Department of Mechanical Engineering,
Kamaraj College of Engineering and Technology,
Virudhunagar 626001, Tamilnadu, India
e-mail: narayananx5@gmail.com

N. Selvakumar

Senior Professor
Department of Mechanical Engineering,
Mepco Schlenk Engineering College,
Sivakasi 626005, Tamilnadu, India

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 21, 2016; final manuscript received November 23, 2016; published online May 17, 2017. Assoc. Editor: Dae-Eun Kim.

J. Tribol 139(5), 051301 (May 17, 2017) (11 pages) Paper No: TRIB-16-1228; doi: 10.1115/1.4035383 History: Received July 21, 2016; Revised November 23, 2016

In the present study, the effects of TiC content on the microstructure, hardness, and wear property are to be investigated. Magnesium matrix hybrid composites reinforced with varying wt.% of TiC (0, 5, 10, 15, and 20) and a fixed wt.% of MoS2 (7.5) were produced by powder metallurgy. The microstructure of the hybrid composite samples was analyzed using optical microscopy. Elemental composition of sintered specimens was determined by energy dispersive X-ray spectroscopy (EDS) analysis. The Vicker's hardness test was performed in different locations on the sintered specimen surface with a load of 5 g and 15 s dwell time. The dry sliding wear test was carried out in a pin-on-disk wear testing machine at various load (5–30 N), velocity (0.5–3 m/s), and sliding distance (500–3000 m). Tribological investigation was statistically analyzed using Taguchi L27 orthogonal array with four factors at three levels. A graphical and numerical optimization technique was used to find the optimum value of TiC content using the predicted value of the responses. The tribological properties of the fabricated composites improved significantly compared to that of the magnesium matrix due to the combined effect obtainable by both reinforcements.

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Figures

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Fig. 1

Particle size distribution of as-received: (a) Mg powder, (b) TiC powder, and (c) MoS2 powder

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Fig. 2

Scanning electron microscopy (SEM) images of (a) Mg powders, (b) TiC particles, and (c) MoS2 particles

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Fig. 3

Optical micrographs of sintered samples (a) Mg-7.5MoS2 composites, (b) Mg–5TiC–7.5MoS2, (c) Mg–10TiC–7.5MoS2, (d) Mg–15TiC–7.5MoS2, and (e) Mg–20TiC–7.5MoS2 hybrid composites

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Fig. 4

EDS analysis of sintered samples: (a) Mg–7.5MoS2 composites, (b) Mg–5TiC–7.5MoS2, (c) Mg–10TiC–7.5MoS2, (d) Mg–15TiC–7.5MoS2, and (e) Mg–20TiC–7.5MoS2 hybrid composites

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Fig. 5

Density and microhardness values of the prepared samples

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Fig. 6

Variation of the wear loss of Mg–MoS2 composite and Mg–TiC–MoS2 hybrid composites with: (a) weight percentage of TiC, (b) applied load, (c) sliding distance, and (d) sliding speed

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Fig. 7

Variation of the coefficient of friction of Mg–MoS2 composite and Mg–TiC–MoS2 hybrid composites with: (a) weight percentage of TiC, (b) applied load, (c) sliding distance, and (d) sliding speed

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Fig. 8

Normal probability plots of residuals for: (a) wear loss and (b) coefficient of friction

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Fig. 9

Contour plot of wear loss effect between TiC reinforcement content and (a) applied load, (b) sliding distance, and (c) sliding speed

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Fig. 10

Overlaid contour plot of the effect between TiC reinforcement content and (a) applied load, (b) sliding distance, and (c) sliding speed

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Fig. 11

SEM micrograph of a worn surface after wear test of: (a) Mg–7.5MoS2 composite,(b) Mg–5TiC–7.5MoS2, (c) Mg–10TiC–7.5MoS2, (d) Mg–15TiC–7.5MoS2, and (e) Mg–20TiC–7.5MoS2 hybrid composites

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Fig. 12

SEM micrograph of debris particle after wear test of: (a) Mg–7.5MoS2 composite, (b) Mg–5TiC–7.5MoS2, (c) Mg–10TiC–7.5MoS2, (d) Mg–15TiC–7.5MoS2, and (e) Mg–20TiC–7.5MoS2 hybrid composites

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