Functional Multi-Nanolayer Coatings of Amorphous Carbon/Tungsten Carbide with Exceptional Mechanical Durability and Corrosion Resistance

Narguess Nemati, Mansoor Bozorg, Oleksiy V. Penkov, Dong Gap Shin, Asghar Sadighzadeh, Dae Eun Kim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A novel functional multilayer coating with periodically stacked nanolayers of amorphous carbon (a:C)/tungsten carbide (WC) and an adhesion layer of chromium (Cr) was deposited on 304 stainless steel using a dual magnetron sputtering technique. Through process optimization, highly densified coatings with high elasticity and shear modulus, excellent wear resistance, and minimal susceptibility to corrosive and caustic media could be acquired. The structural and mechanical properties of the optimized coatings were studied in detail using a variety of analytical techniques. Furthermore, finite element method simulations indicated that the stress generated due to contact against a steel ball was distributed well within the coating, which allowed the stresses to be lower than the yield threshold of the coating. Thus, an ultralow wear rate of ∼10-12mm3/N mm could be achieved in dry sliding conditions under relatively high Hertzian contact pressures of ∼0.4-0.9 GPa. The amorphous and pinhole-free structure of the individual layers, sufficient number of pairs, and the relatively dense stacked layers resulted in significant polarization resistance (Z″ = 5.5 × 106 ω cm2) and increased the corrosion resistance of the coating by 10-fold compared to that of recently reported corrosion-resistant coatings.

Original languageEnglish
Pages (from-to)30149-30160
Number of pages12
JournalACS Applied Materials and Interfaces
Volume9
Issue number35
DOIs
Publication statusPublished - 2017 Sep 6

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this