Friction and wear characteristics of electrodeposited nanocrystalline nickel-tungsten alloy films

Haseeb, A.S. Md. Abdul and Albers, U. and Bade, Klaus (2008) Friction and wear characteristics of electrodeposited nanocrystalline nickel-tungsten alloy films. Wear, 264 (1-2). pp. 106-112. ISSN 0043-1648, DOI

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Electrodeposited nanocrystalline nickel-tungsten alloys are being investigated as an attractive alternative to electrodeposited nickel for applications involving fabrication of micro electro mechanical systems (MEMS). Ni-W alloys are also being considered as an environmentally friendly alternative to hard chrome plating in some cases. In applications involving sliding contacts such as in micro-gears in MEMS, mould inserts, etc., tribological properties of Ni-W alloys would be of relevance. In this work, the sliding friction and wear characteristics of Ni-W alloys with different tungsten contents were investigated and compared with that of nickel film deposited from sulphamate bath commonly used in microfabrication. For wear tests, Ni-W alloy films of about 5-7 mu m, deposited from ammonia-citrate baths on copper substrates were employed. The alloy films possessed W contents in the range of 8.4-12.7 at. and had an average grain size of about 20 nm. Wear tests were conducted in a pin-on-disc type tribometer under un-lubricated conditions. All the wear tests were carried out at room temperature in air with a controlled relative humidity of 50 +/- 5 at a normal load and linear sliding speed of 1 N and 3 cm s(-1), respectively. Hardened steel balls were used as the counter body. Friction force was recorded online during the wear test. Wear damage on Ni and Ni-W alloy films was estimated from the width of the wear track and the wear rate of the counter body was calculated from the worn volume. Results show that Ni-W alloys have somewhat lower friction coefficient against steel counter body as compared with that of the nickel-steel pair. Addition of tungsten to nickel is also seen to result in an improvement in wear resistance. Friction and wear mechanisms operative in Ni-W alloys sliding against steel are discussed. (C) 2007 Elsevier B.V. All rights reserved.

Item Type: Article
Additional Information: Haseeb, A. S. M. A. Albers, U. Bade, K.
Uncontrolled Keywords: Ni–W alloys; Ni; Electrodeposition; Friction coefficient; Adhesive wear; Oxidative wear
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr. Mohammed Salim Abd Rahman
Date Deposited: 17 Apr 2013 02:34
Last Modified: 16 Oct 2018 04:50

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