Research Papers: Lubricants

Influence of MoS2, H3BO3, and MWCNT Additives on the Dry and Lubricated Sliding Tribology of AMMC–Steel Contacts

[+] Author and Article Information
Harpreet Singh

Mechanical Engineering Department,
Thapar University,
Patiala 147004, Punjab, India
e-mail: harpreetsingh6n2016@gmail.com

ParamPreet Singh

Mechanical Engineering Department,
Thapar University,
Patiala 147004, Punjab, India
e-mail: psingh.param@gmail.com

Hiralal Bhowmick

Mechanical Engineering Department,
Thapar University,
Patiala 147004, Punjab, India
e-mail: hiralal.bhowmick@thapar.edu

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 14, 2017; final manuscript received November 10, 2017; published online February 9, 2018. Assoc. Editor: Sinan Muftu.

J. Tribol 140(4), 041801 (Feb 09, 2018) (10 pages) Paper No: TRIB-17-1313; doi: 10.1115/1.4038957 History: Received August 14, 2017; Revised November 10, 2017

The present study is focused on the performance evaluation of MoS2, H3BO3, and multiwall carbon nanotubes (MWCNT) used as the potential oil additives in base oil for aluminum metal matrix composites (AMMC)–steel (EN31) tribocontact. Al–B4C composite is used for this purpose; based on a set of preliminary investigation under unlubricated and fresh oil lubrication, three different types of AMMCs (Al–SiC, Al–B4C, and Al–SiC–B4C) were used. A pin-on-disk tribometer is used for all the friction and wear tests under operating condition of load 9.8 N and sliding velocity of 0.5 m/s. From the particle-based wet tribology, it is clear that both the additives H3BO3 and MWCNT improve the friction as well as wear behavior for selected composite contacts. Multiwall carbon nanotubes emerged out as superior among all the additives, whereas MoS2 additives show marginal enhancement in frictional performance under given operating conditions. Fractography and morphological study of pin specimens are carried out to identify the underlying friction and wear mechanisms.

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Fig. 1

Scanning electron microscope (SEM) micrographs of as-received powders of: (a) B4C and (b) SiC

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Fig. 2

(a) SEM micrograph and (b) EDS on Al–B4C composite

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Fig. 3

Microstructures of particles: (a) H3BO3, (b) MoS2, and (c) MWCNT

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Fig. 4

Vickers hardness measurements for alloy as well as different alloy composites

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Fig. 5

Variation of coefficient of friction for Al-composites in unlubricated conditions

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Fig. 6

Variation of coefficient of friction for various composites in fresh oil lubricated (SN500) conditions

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Fig. 7

Bar graph showing effectiveness of particle additives in dry as well wet tribology

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Fig. 8

Variation of coefficient of friction for Al–B4C composites in particle based liquid lubrication

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Fig. 9

The effect of sliding speed on coefficient of friction for Al–B4C composites in fresh oil without additives and fresh oil with MWCNT additives. (Inset: corresponding Stribeck curves for fresh oil and fresh oil with MWCNT additives).

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Fig. 10

Measured profiles of worn out Al6061/B4C pins after wear test at a speed of 0.5 m/s and under different lubricated conditions: (a) fresh oil without additives, (b) fresh oil with MoS2 additives, (c) fresh oil with MWCNT additives, and (d) fresh oil with H3BO3 additives

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Fig. 11

SEM morphologies and selected EDS inspection field of wear tracks on Al–B4C pin under dry sliding contact condition. The white arrows in the figure are indicating sliding direction.

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Fig. 12

SEM morphologies and selected EDS inspection field of wear tracks on Al–B4C pin under lubricated sliding contact conditions. The white arrows in the figure are indicating sliding direction.

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Fig. 13

SEM morphologies and selected EDS inspection field of Al–B4C wear tracks on pin surfaces under various particles additives in base oil such as: (a) and (d) H3BO3, (b) and (e) MWCNT, and (c) and (f) MoS2. The white arrows in the figure are indicating sliding direction.

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Fig. 14

XRD on the wear track of Al–B4C composites slides under particle aided lubricants: (a) H3BO3, (b) MWCNT, and (c) MoS2



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