Experimental evaluation of friction and wear properties of solid lubricant coatings on SUS440C steel in liquid nitrogen

B. Subramonian, K. Kato, K. Adachi, B. Basu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The friction and wear properties of the prevailing different solid lubricant coatings (Ion-plated Au, Ion-plated Ag and RF-sputtered PTFE on SUS440C stainless steel) used in the bearings of high-speed cryogenic-turbo-pumps of liquid rocket engines were experimentally evaluated in liquid nitrogen immersed conditions. Also the above experiments were carried out with two newly proposed solid lubricant coatings of sputter-ion-plated MoSTi and a new ion-plated Pb on SUS440C stainless steel. The friction coefficient and wear rates of the coatings of ion-plated Au, ion-plated Ag, RF-sputtered PTFE, the new ion-plated Pb and MoS2Ti-SIP (with coating thickness of 0.7±0.1 μm) on SUS440C steel against SUS440C stainless steel ball in liquid nitrogen were compared. Worn surfaces were examined microscopically with a microscope and a profilometer for understanding the mechanisms of friction and wear and transfer film lubrication in liquid nitrogen. It is found that the newly proposed solid lubricant coatings are showing promising results for their use in liquid nitrogen immersed conditions. The sputter-ion-plated MoSTi coating on SUS 440C steel shows a minimum value of friction coefficient (μ=0.015) and wear rate (wc =0.56 × 10-6 mm3/N m) in liquid nitrogen.

Original languageEnglish
Pages (from-to)263-272
Number of pages10
JournalTribology Letters
Volume20
Issue number3-4
DOIs
Publication statusPublished - 2005 Dec 1
Externally publishedYes

Keywords

  • Cryogenic-turbo-pump
  • MoSTi-SIP (sputter-ion-plating)
  • Pb-ion-plating
  • SUS440C steel
  • Solid lubricant coating
  • Transfer film

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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