Journal
TRIBOLOGY INTERNATIONAL
Volume 87, Issue -, Pages 23-31Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2015.02.010
Keywords
Solid lubricant; High temperature lubrication; Raman spectroscopy; Nanoscratch
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Funding
- Tekes-the Finnish Funding Agency for Innovation [40042/08]
- Academy of Finland via Graduate School for Advanced Materials and Processes [118728]
- Academy of Finland (AKA) [118728, 118728] Funding Source: Academy of Finland (AKA)
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Self-lubricating Al2O3+1-10 vol% Mo composites were synthesized by pulsed electric current sintering. Molybdenum was found to strongly influence the coefficient of friction against alumina. Lubricious oxide of Mo4O11 formed within the wear track during wear at 400 degrees C and reduced the coefficient of friction. The composites with Mo had coefficient of friction of 0.35-0.71 at 25 degrees C and 0.27-0.36 at 400 degrees C. No measureable wear was observed for composites with 1, 2.5 and 5 vol% Mo. Nanoscratch tests were performed inside the wear tracks to study the friction properties of the transfer film. Alumina molybdenum composites performed as wear resistant materials with very good friction properties at 400 degrees C owing formation of Mo4O11 during wear. (C) 2015 Elsevier Ltd. All rights reserved.
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