A novel composite-layered coating enabling self-enhancing thermal barrier performance. (1st April 2019)

• Record Type: Journal Article
• Authors: Li, Guang-Rong; Wang, Li-Shuang; Yang, Guan-Jun
• Is Part Of: Scripta materialia. Number 163(2019)
• Page Start: 142
• Page End: 147
• Publication Date: 2019-04-01
• Subjects: Thermal barrier coating -- Plasma spraying -- Sintering -- Thermal conductivity -- Self-enhanced behavior; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.01.010
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A novel composite-layered thermal barrier coating is designed to solve performance degradation caused by inevitable thermal exposure. Inspired by cathodic protection with a sacrificial anode, a degradation-resistant thermal barrier was achieved by the spontaneous formation of mesopores. The increment of thermal conductivity decreased from 110% for conventional coatings to 40% for composite coatings, which means 50% self-enhanced thermal insulation was realized. A new mechanism based on effective thermal-resistance was proposed to account for the self-enhanced behavior. The effective area for heat flux prevention was increased from 10 to 30% for 2D micropores to ~60% for the newly-formed 2D mesopores. Graphical abstract: Unlabelled Image