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Wear Performance of Titanium and Niobium Added MoS2 Coatings Under Isobutane Exposure

[+] Author Affiliations
Mahmut F. Aksit

Sabanci University, Istanbul, Turkey

Huseyin Kizil, Kemal Sariibrahimoglu

Istanbul Technical University, Istanbul, Turkey

Ihsan Efeoglu

Ataturk University, Erzurum, Turkey

Paper No. IJTC2009-15209, pp. 265-267; 3 pages
doi:10.1115/IJTC2009-15209
From:
  • ASME/STLE 2009 International Joint Tribology Conference
  • ASME/STLE 2009 International Joint Tribology Conference
  • Memphis, Tennessee, USA, October 19–21, 2009
  • Conference Sponsors: Tribology Division
  • ISBN: 978-0-7918-4895-1 | eISBN: 978-0-7918-3862-4
  • Copyright © 2009 by ASME

abstract

As conventional refrigerants phased out, Hydrocarbons such as Isobutane emerged as the main alternative in refrigeration industry. However, compatibility of these new ozone friendly refrigerants with compressor oils and bearing materials need to be evaluated. This study investigates wear performance of Titanium and Niobium added MoS2 coatings running against 100Cr6 steel under isobutane exposure. Wear performance is established under starved lubrication condition by comparing the maximum achieved sliding distance before the sudden increase and fluctuation of the friction curve. Sinter steel samples were coated with MoS2 , MoS2 -Ti, MoS2 -Nb thin films by magnetron sputtering. The concept of durability distance has been defined as the distance until a sudden fluctuation of the friction curve is observed. It was found that addition of Titanium and Niobium adversely affects wear performance of the MoS2 coatings under isobutane exposure. This can be attributed to the possible degradation of MoS2 lamellar structure that acts as solid lubricant under such exposure.

Copyright © 2009 by ASME
Topics: Wear , Coatings , Titanium

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