Research Papers: Micro-Nano Tribology

Nanoscratch Resistance and Nanotribological Performance of Ti/MoS2 Coating on Al-Si Alloy Deposited by Pulse Laser Deposition Technique

[+] Author and Article Information
Summera Banday

Tribology Laboratory,
Department of Mechanical Engineering,
Srinagar 190006, Jammu and Kashmir, India

M. F. Wani

Tribology Laboratory,
Department of Mechanical Engineering,
Srinagar 190006, Jammu and Kashmir, India
e-mail: mfwani@nitsri.ac.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 26, 2018; final manuscript received August 29, 2018; published online October 24, 2018. Assoc. Editor: Yi Zhu.

J. Tribol 141(2), 022003 (Oct 24, 2018) (9 pages) Paper No: TRIB-18-1207; doi: 10.1115/1.4041366 History: Received May 26, 2018; Revised August 29, 2018

Ti/MoS2 coating was deposited by pulse laser deposition technology on Al-Si substrate. The microstructure, elemental analysis, nanotribological behavior of coating was investigated. The coating was composed of Ti, Mo, S, and O with typical diffraction peak around 2θ range from 30 deg to 70 deg. Nanoscratch with ramp loading was performed at low loads. The scratch test with ramp normal loading was analyzed for failure of coating in three ranges, viz., range A, range B, and range C. Scratch test result shows that the peeling of coating occurred at the normal load of 1327.75 μN and the lateral load of 75.96 μN. Nanowear with 2, 4, 6, 8, 10 number of cycles was performed at low load 100 μN. Nanowear results shows that wear rate decreases with increase in wear cycles, which attributed the self-lubricating property of Ti/MoS2 coating. Also, Ti/MoS2 coating display smooth wear path with no debris and cracks, which attributed plastic flow of coating around impression. Thus, mode of wear mechanism is mainly ductile and abrasive.

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Fig. 1

EDS of targets used for PLD coating (a) MoS2 target and (b) Ti target

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Fig. 2

Scratch test with normal ramp loading of 2000 μN conducted in nine segments

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Fig. 3

Surface topography using SPM: (a) Ti/MoS2 Coating roughness deposited on Al-Si substrate and (b) 3D SPM image of the coating surface

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Fig. 4

(a) Scanning electron microscope micrograph of Ti/MoS2 coating deposited on Al-Si substrate and ((b) and (c)) EDS spectrum at point 1, point 2, and point 3

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Fig. 5

Scanning electron microscope image showing the cross section of the Ti/MoS2 coating deposited on Al-Si substrate

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Fig. 6

X-ray diffraction pattern of Ti/MoS2 coating deposited on Al-Si substrate

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Fig. 7

Raman spectra of Ti/MoS2 coating deposited on Al-Si substrate

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Fig. 8

The nanoscratch test results for ramping normal load of 2000 μN for Ti/MoS2 coating: (a) scratch depth versus scratch distance, (b) lateral load versus scratch distance, and (c) COF versus scratch distance

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Fig. 9

(a) 2D in situ SPM image of the scratch damage with normal ramp load of 2000 μN for Ti/MoS2 coating and (b) 3D in situ SPM image of the scratch damage with normal ramp load of 2000 μN for Ti/MoS2 coating

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Fig. 10

The 2D and 3D SPM images of wear test on Ti/MoS2 coated sample at 100 μN: ((a) and (b)) two cycles; ((c) and (d)) four cycles, ((e) and (f)) six cycles, ((g) and (h)) eight cycles, and ((i) and (j)) ten cycles

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Fig. 11

The dependence of wear rate of Ti/MoS2 coating on wear cycles (two cycles, four cycles, six cycles, eight cycles, and ten cycles)



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