Journal
CORROSION SCIENCE
Volume 158, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108102
Keywords
Air plasma spray; CoCrAlY-TiB2 composite coating; Microstructures; Bonding strength; Cyclic oxidation
Funding
- National Key R&D Program of China [2017YFB0703100]
- National Natural Science Foundation of China (NSFC) [51822103, 51731009, 51671068]
- Fundamental Research Funds for the Central Universities [HIT.BRETIV.201902]
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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 degrees 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 Al2O3 and Cr2O3 oxides.
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