Hard and adherent a-C : H gradient coatings by stress engineering

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

2 Scopus Citations
View graph of relations

Author(s)

  • Liangliang Liu
  • Xiaokai An
  • Zhengyong Ma
  • Zhongzhen Wu
  • Wei Tang
  • Hai Lin
  • Ricky KY. Fu
  • Xiubo Tian
  • Feng Pan

Detail(s)

Original languageEnglish
Pages (from-to)921-926
Journal / PublicationJournal of Alloys and Compounds
Volume765
Early online date27 Jun 2018
StatePublished - 15 Oct 2018

Abstract

Hydrogenated diamond like carbon (a-C:H) coatings typically have low friction but high residual stress. The hardness which depends on the sp3 proportion increases not only the coating lifetime, but also the residual stress which can lead to easy film delamination especially for thick coatings. In this work, several thick a-C:H coatings (>10 μm) with different stress and hardness are prepared using stress engineering to mitigate stress accumulation while the hardness is retained. A low compressive residual stress of 0.42–0.84 GPa is achieved from the 8 μm thick a-C:H coating in addition to a high critical load of 63–74 N and hardness of over 26 GPa. The other desirable tribological and anticorrosion properties include a small friction coefficient of 0.13, low wear rate of 1.01 × 10−15 m3/N·m, high corrosion potential of - 479.6 mV, as well as small corrosion current density of 1.77 μA/cm2.

Research Area(s)

  • a-C:H, Adhesion, High hardness, Stress engineering

Citation Format(s)

Hard and adherent a-C : H gradient coatings by stress engineering. / Liu, Liangliang; An, Xiaokai; Ma, Zhengyong; Wu, Zhongzhen; Tang, Wei; Lin, Hai; Fu, Ricky KY.; Tian, Xiubo; Chu, Paul K.; Pan, Feng.

In: Journal of Alloys and Compounds, Vol. 765, 15.10.2018, p. 921-926.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review