Low adhesion effect of novel duplex NC/WC:C coatings against ductile materials at elevated temperatures

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Imperial College London
  • AIN Asociación de la Industria Navarra

Abstract

A novel anti-adhesive NC/WC:C surface processing is presented enabling green machining of ductile materials at elevated temperatures. The duplex coatings are produced by the active screen plasma nitrocarburising followed by physical vapour WC:C deposition. Microstructure analysis showed that duplex NC/WC:C system is composed by a nanolayered low adhesive WC:C coating and an extra load-bearing NC hardened case, obtaining favourable frictional properties at elevated temperatures. The coefficient of friction of duplex coating NC/WC:C was significantly lower compared to sole WC:C coating or untreated surfaces, and as demonstrated, depending on the testing temperature non-linearly, including an ultra-low adhesion at 350 °C. Furthermore, the quantified adhesion rate is clearly correlated with the nanomechanical properties especially the elastic parameters.

Details

Original languageEnglish
Pages (from-to)32-35
JournalMaterials Letters
Volume220
Early online date20 Feb 2018
Publication statusPublished - 1 Jun 2018