Enhanced interfacial bonding and superior oxidation resistance of CoCrAlY-TiB2 composite coating fabricated by air plasma spraying. (September 2019)

• Record Type: Journal Article
• Authors: An, Qi; Huang, Lujun; Wei, Shaolou; Zhang, Rui; Rong, Xudong; Wang, You; Geng, Lin
• Is Part Of: Corrosion science. Volume 158(2019)
• Publication Date: 2019-09
• Subjects: Air plasma spray -- CoCrAlY-TiB2 composite coating -- Microstructures -- Bonding strength -- Cyclic oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108102
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: CoCrAlY-TiB2 composite coating was firstly studied by air plasma spray. Surface etching pretreatment was applied to increase substrate roughness. TiB2 addition enhanced the bonding strength and physicochemical stability. Oxidation resistance was improved and oxidation mechanism was elucidated. Abstract: In order to enhance oxidation resistance of titanium matrix materials, CoCrAlY-TiB2 coating is introduced by air plasma spray. Tensile test demonstrates that TiB2 addition promoted interfacial bonding strength with a maximum enhancing effect of 22.6%, which alleviated mechanical spallation of the coating and consequently gave rise to the improved physicochemical stability. Cyclic oxidation tests at 700, 800, and 900 °C reveal that weight gain of coated specimens reduced by 66.7%, 73.1%, and 75.2% compared with the TMCs substrate. The significantly enhanced anti-oxidation performance was mostly ascribed to the improved microstructural stability and the formation of dense Al2 O3 and Cr2 O3 oxides.