Damage-Tolerant, Hard Nanocomposite Coatings Enabled by a Hierarchical Structure

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• 作者：Jiang Xu ; XiangZhen Mao ; Zong-Han. Xie ; Paul Munroe
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：October 6, 2011
• 年：2011
• 卷：115
• 期：39
• 页码：18977-18982
• 全文大小：1024K
• 年卷期：v.115,no.39(October 6, 2011)
• ISSN：1932-7455

文摘

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 渭m 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 D8_m-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.