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Advances in Tribology
Volume 2011, Article ID 248037, 11 pages
Research Article

Development of New PM Iron-Based Materials for Self-Lubricating Bearings

Faculty of Mechanics, University of Craiova, 107 Calea Bucuresti, 200512 Craiova, Romania

Received 30 June 2011; Revised 22 September 2011; Accepted 27 September 2011

Academic Editor: Pedro Arrazola

Copyright © 2011 Cristina Teisanu and Stefan Gheorghe. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Using PM technologies, new antifriction materials based on iron powder with different addition elements were developed in order to obtain self-lubricated bearings with improved tribological features. The elemental powder mixtures were blended for 2 hours in a 3D homogenization device, were compacted at a pressure of 500 MPa, and then sintered in dry hydrogen atmosphere at different temperatures for different maintaining times. The effect of technological parameters on physical properties (density and dimensional changes) was presented in this study. The mechanical and tribological properties (tensile strength, hardness, impact energy, friction coefficient, and wear rate) related to addition elements were evaluated. The tribological behaviour of the selected iron-based alloys was analysed by pin on disc tests without lubrication. Also, the wear surface scars and the microstructure of the wear surfaces were investigated.