Journal
CORROSION SCIENCE
Volume 191, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109747
Keywords
Enamel coating; Thermal shock; ZrB2; Oxidation; Cracks self-healing
Funding
- Excellent Youth Foundation of Liaoning Province [2019-YQ-03]
- National Natural Science Foundation of China [51871051]
- Ministry of Industry and Information Technology Project [MJ-2017-J-99]
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This study demonstrates that the addition of nanoparticles of ZrB2 in enamel composite coating enhances both oxidation protection and high thermal shock resistance at temperatures of 700 and 800 degrees C. This is attributed to the high thermal stability of ZrB2 and its unique oxidation products, which allow cracks to heal.
Enamel coating only provides high oxidation resistance for alloys at temperatures below or close to softening temperature, where cracks are difficult to self-heal due to the high viscous. In this study, the enamel composite coating with nanoparticles of Ni or Fe suffers cracking and local spallation under thermal shock from 700 degrees C to room temperature. With addition of nanoparticles of ZrB2, The enamel composite coating provides well oxidation protection meanwhile high thermal shock resistance at temperatures of 700 and 800 degrees C. Cracks are able to heal owing to the high thermal stability of ZrB2 and its unique oxidation products.
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