Next Article in Journal
Common Properties of Lubricants that Affect Vehicle Fuel Efficiency: A North American Historical Perspective
Next Article in Special Issue
Cryogenic Milling: Study of the Effect of CO2 Cooling on Tool Wear When Machining Inconel 718, Grade EA1N Steel and Gamma TiAl
Previous Article in Journal
Study of the Lubricating Ability of Protic Ionic Liquid on an Aluminum–Steel Contact
Open AccessArticle

Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

1
Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India
2
Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
*
Author to whom correspondence should be addressed.
Lubricants 2018, 6(3), 67; https://doi.org/10.3390/lubricants6030067
Received: 6 July 2018 / Revised: 31 July 2018 / Accepted: 31 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Tribological Challenges in Extreme Environments)
Ni–B alloys deposited by the electroless method are considered to be hard variants of the electroless nickel family. Inclusion of Mo or W to form ternary alloys improves the thermal stability of electroless nickel coatings. Therefore, in the present work, Ni–B, Ni–B–Mo, and Ni–B–W coatings are deposited; and their tribological behavior at room and high temperatures are investigated. Electroless Ni–B, Ni–B–Mo, and Ni–B–W coatings are deposited on AISI 1040 steel substrates. The coatings are heat treated to improve their mechanical properties and crystallinity. Tribological behavior of the coatings is determined on a pin-on-disc type tribological test setup using various applied normal loads (10–50 N) and sliding speeds (0.25–0.42 m/s) to measure wear and coefficient of friction at different operating temperatures (25 °C–500 °C). Ni–B–W coatings are observed to have higher wear resistance than Ni–B or Ni–B–Mo coatings throughout the temperature range considered. Although for coefficient of friction, no such trend is observed. The worn surface of the coatings at 500 °C is characterized by lubricious oxide glazes, which lead to enhanced tribological behavior compared with that at 100 °C. A study of the coating characteristics such as composition, phase transformations, surface morphology, and microhardness is also carried out prior to tribological tests. View Full-Text
Keywords: electroless; Ni–B; Ni–B–W; Ni–B–Mo; COF; mass loss; high temperature electroless; Ni–B; Ni–B–W; Ni–B–Mo; COF; mass loss; high temperature
Show Figures

Graphical abstract

MDPI and ACS Style

Mukhopadhyay, A.; Barman, T.K.; Sahoo, P.; Davim, J.P. Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures. Lubricants 2018, 6, 67.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop