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Effect of Mn on the Formation of Oxide Buildups Upon HVOF-Sprayed MCrAlY-Ceramic-Type Cermet Coatings

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Abstract

Thermal spray coatings have been widely used on hearth rolls in a continuous annealing line to improve steel sheet quality and to prolong the roll service life. One of the common defects formed on a working hearth roll is the oxide buildup. HVOF-sprayed CoCrAlY-CrB2-Y2O3 coating was used in this study to duplicate buildups by reacting with Fe and Mn oxides. The reaction was performed in a furnace at 900 °C with inert gases flowing through. After reacting for 8 days, large Mn-rich buildups were formed on the coating while the buildups without Mn were very small. Mn was shown to enhance the formation of buildups. Buildups from a hearth roll were also examined and compared with the laboratory ones.

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Authors and Affiliations

  1. China Steel Corporation, Kaohsiung, Taiwan

    Tsai-Shang Huang

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  1. Tsai-Shang Huang
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Correspondence to Tsai-Shang Huang.

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Huang, TS. Effect of Mn on the Formation of Oxide Buildups Upon HVOF-Sprayed MCrAlY-Ceramic-Type Cermet Coatings. J Therm Spray Tech 20, 447–455 (2011). https://doi.org/10.1007/s11666-010-9531-y

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  • DOI: https://doi.org/10.1007/s11666-010-9531-y

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