Experimental Evaluation of Friction and Wear Properties of Solid Lubricant Coatings on SUS440C Steel in Liquid Nitrogen |
| |
Authors: | B Subramonian K Kato K Adachi B Basu |
| |
Affiliation: | (1) Laboratory of Tribology, Tohoku University, Sendai 980-8579, Japan;(2) Department of Space, JSPS Ronpaku fellow, India;(3) IIT, Kanpur, India |
| |
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. |
| |
Keywords: | solid lubricant coating transfer film cryogenic-turbo-pump SUS440C steel Pb-ion-plating MoS2Ti-SIP (sputter-ion-plating) |
本文献已被 SpringerLink 等数据库收录! |
|