Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10668679 | Surface and Coatings Technology | 2010 | 6 Pages |
Abstract
Recent developments in coating science and technology offer new opportunities to enhance the energy-efficiency and performance of industrial machinery such as hydraulic fluid pumps and motors. The lubricated friction and wear characteristics of two wear-resistant coatings, diamond-like carbon and a nanocomposite material based on AlMgB14-50 vol.% TiB2, were compared in pin-on-disk tribotests using Mobil DTE-24⢠oil as the lubricant. In each case, the pins were fixed 9.53 mm diameter spheres of AISI 52100 steel, the load was 10 N, and the speed 0.5 m/s in all tests. Average steady-state friction coefficient values of 0.10 and 0.08 were measured for the DLC and nanocomposite, respectively. The coatings and their 52100 steel counterfaces were analyzed after the tests by X-ray photoelectron and Auger spectroscopy for evidence of material transfer or tribo-chemical reactions. The low-friction behavior of the boride nanocomposite coating is due to the formation of lubricative boric acid, B(OH)3. In contrast, the low-friction behavior of the DLC coating is related to the relatively low dielectric constant of the oil-based lubricant, leading to desorption of surface hydrogen from the coating.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Bruce A. Cook, Joel L. Harringa, James Anderegg, Alan M. Russell, Jun Qu, Peter J. Blau, Clifton Higdon, Alaa A. Elmoursi,