The effect of electroless nickel film on the tribological characteristics of alumina coatings

Jen Fin Lin, Jeng Chang Lian, Ke Yang Li

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Extensive research has been done to examine the differences in tribological behavior of alumina coatings with and without electroless nickel film as underlayer. Dry sliding wear tests were carried out using the thrust-on-washer adapter on a wear test machine. An ECR (electrical contact resistance) device was mounted on this machine to allow researchers to evaluate the wear life of the alumina coating on the lower specimen from observation of the abrupt drop in electrical voltage that may occur when the maximum depth of the wear track is greater than the thickness of the alumina coating. Both the WC + Co coating of the upper specimen and the alumina coating of the lower specimen were prepared by plasma spraying. The investigation aims to gain a better understanding of the effect of electroless nickel film deposited as the underlayer of the lower specimen on its adhesion strength with the steel substrate and the wear life of the alumina coating. The experimental results reveal that the deposition of the electroless nickel film has a notable effect on the wear life and adhesion strength. The wear life of specimens with an electroless nickel film is much longer than that of specimens without it, unless the alumina layer is thinner than 0.3 mm. The adhesion strength between the underlayer and the steel substrate is attenuated by plating an excessively thick or a very thin electroless nickel film. The deposition of the electroless nickel film impeded the oxidation of the steel substrate and the third body wear in dry sliding. The specimen temperatures measured at the steel substrate of the lower specimen, irrespective of the application of the electroless nickel film, can be fitted well by the power form of the friction power parameter.

Original languageEnglish
Pages (from-to)199-212
Number of pages14
JournalWear
Volume209
Issue number1-2
DOIs
Publication statusPublished - 1997 Aug

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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