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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.59  No.12 (2018)  >  pp.1943-1948

MATERIALS TRANSACTIONS
<<Previous article Vol.59  No.12 (2018)   pp.1943 - 1948 Next article>>

Effect of Duty Cycle on Microstructure, Tungsten Content and Wear Resistance of Tungsten-Cobalt Films Prepared by Electrodeposition

Haipeng Lu, Junqi Qin, Changchun Di, Yuliang Yang and Ruikun Huo
Department of Artillery Engineering, Army Engineering University in Shijiazhuang, No. 97 Heping West Road, Shijiazhuang 050000, China


By studying effect of different duty cycles on tungsten-cobalt film to improve its performances, tungsten-cobalt films were prepared on the surface of PCrNi3MoVA steel by electrodeposition under different duty cycles. The results show that grain size increases with increasing duty cycle but tungsten content, microhardness, film-based bond strength and TC(100) increase first and then decrease with increasing duty cycle. When the duty cycle is 30%, tungsten-cobalt films with highest tungsten content (43.37%), grain size (12.3 nm) and largest TC(100) (0.845) have highest microhardness (7.1 GPa) and strongest film-base bond (24 N), which results in lowest friction coefficient (0.31) and smallest wear rate (2 × 10−5 mm3N−1m−1) that is only 28.57% for the tungsten-cobalt film prepared under 100% duty cycle.




Keyword:
duty cycle, microstructure, tungsten content, pulsed electrodeposition, tungsten-cobalt film, wear resistance

Received: June 13, 2018
Accepted: August 31, 2018 , Published online: November 25, 2018
The Japan Institute of Metals and Materials

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