Effect of load and sliding speed on friction and wear behavior of silver/h-BN containing Ni-base P/M composites

• Published in: Wear Vol. 270; no. 7; pp. 423 - 430
• Main Authors: Tyagi, Rajnesh, Xiong, Dangsheng, Li, Jianliang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.03.2011; Elsevier
• Subjects: Applied sciences; Bearing steels; Chromium steels; Conduction; Exact sciences and technology; Friction; Friction and wear; Friction, wear, lubrication; Frictional wear; Machine components; Mechanical engineering. Machine design; Ni-base composites; Nickel; Powder metallurgy; Self-lubrication; Silver; Silver lubrication; Sliding; Sliding wear; Solid lubricants; Wear; Wear rate; Ni-base composites; Self-lubrication; Sliding wear; Solid lubricants; Friction and wear; Silver lubrication; Third body; Boron nitride; Phosphorus alloys; Synergism; Composite material; Wear rate; Friction coefficient; Lubrication; Self lubricating material; Sliding friction; Solid lubricant; Nickel base alloys; Wear test; Experimental study; Powder metallurgy; Friction material; Silver; Transfer; Tribology
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2010.08.013

The research focuses on the effect of load and sliding speed on the silver and hBN containing solid lubricating Ni-base composites. The effect of different amount of additions of silver has been investigated and discussed. Possibility of an existence of a probable synergetic action between Ag and hBN has also been explored. The wear rate and friction of composites have been found to improve with the addition of silver. However, no noticeable synergy could be observed between Ag and hBN due to poor transfer and adherence characteristics of hBN. Sliding wear of behavior of Ni-based composites, prepared by powder metallurgy route and containing different (0, 8, 12, 16 and 20 wt.%) amounts of silver, was investigated under different loads and speeds by conducting wear tests against a counterface of AISI 52100 ring using a ring-on-disk set up. One composite containing 12 wt.% silver and 4 wt.% h-BN was also prepared and tested under same conditions to investigate the synergistic action of Ag and h-BN. The friction coefficients and the wear rates are significantly reduced by addition of silver and h-BN. The friction coefficient reduced from 0.36 to 0.21 by addition of solid lubricants whereas the reduction was 3–5 times in the wear rates. The friction coefficients of composites decreased with increasing load and sliding speed whereas the wear rates increased marginally. No noticeable synergy could be observed between silver and h-BN because h-BN fails to form strongly adherent transfer film on counterface surface.