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Title: Reconstruction mechanisms of tantalum oxide coatings with low concentrations of silver for high temperature tribological applications

Silver tantalate (AgTaO{sub 3}) coatings have been found to exhibit outstanding tribological properties at elevated temperatures. To understand the mechanisms involved in the tribological behavior of the Ag-Ta-O system, tantalum oxide coatings with a small content of silver were produced to investigate the metastable nature of this self-lubricating material. The coatings were produced by unbalanced magnetron sputtering, ball-on-disk wear tested at 750 °C, and subsequently characterized by X-ray diffraction, Scanning Auger Nanoprobe, cross-sectional Scanning Electron Microscopy, and Transmission Electron Microscopy. Complementary molecular dynamic simulations were carried out to investigate changes in the chemical and structural properties at the interface due to sliding for films with varying silver content. Both the experimental characterization and the theoretical modeling showed that silver content affects friction and wear, through the role of silver in film reconstruction during sliding. The results suggest that the relative amount of silver may be used to tune film performance for a given application.
Authors:
; ;  [1] ; ;  [2] ; ;  [3]
  1. Department of Material Science and Engineering, University of North Texas, Denton, Texas 76207 (United States)
  2. School of Engineering, University of California Merced, Merced, California 95343 (United States)
  3. Department of Physics, King Mongkut's University of Technology Thonburi, Bangkok 10140 (Thailand)
Publication Date:
OSTI Identifier:
22391939
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COATINGS; FILMS; MAGNETRONS; PERFORMANCE; SCANNING ELECTRON MICROSCOPY; SILVER; SILVER COMPOUNDS; SIMULATION; SPUTTERING; TANTALUM OXIDES; TEMPERATURE RANGE 0400-1000 K; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION