Title

Damage-tolerant, hard nanocomposite coatings enabled by a hierarchical structure

Document Type

Journal Article

Faculty

Faculty of Computing, Health and Science

School

School of Engineering (SOE)

RAS ID

12640

Comments

This article was originally published as: Xu, J. , Mao, X., Xie, Z. , & Munroe, P. (2011). Damage-tolerant, hard nanocomposite coatings enabled by a hierarchical structure. Journal of Physical Chemistry C, 115(39), 18977-18982. Original article available here

Abstract

A novel hierarchical structured coating was prepared on a pure titanium substrate by a double cathode glow discharge technique. This coating consisted of a 1 μm thick C40-structured MoSi2 outer layer with an average grain size of 5 nm and an underlying MoSi2/Mo5Si3 layer having a gradient, bimodal microstructure, in which C40-structured MoSi2, with an average grain size of 5 nm, is embedded within an intergranular region of D8m-structured Mo5Si3, with an average grain size of 40 nm. The ratio of Mo5Si3 to MoSi2 increased gradually away from the outer surface. Compared with a monolithic MoSi2 coating, the hierarchical structured coating exhibited a marked increase in toughness, while maintaining its hardness.

 

Link to publisher version (DOI)

10.1021/jp204091e