Performance of plasma-sprayed MoSi2-based coating as a heating element

Rollers covered with a thermally sprayed heater coating are an alternative to conventional stream heated and electromagnetic induction heated rollers. In this study, a heater coating was developed using a combination of a thermally sprayed NiAl bonding layer, an MgAl2O4 insulating layer, and an MoSi...

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Bibliographic Details
Published in:Ceramics international 2020-11, Vol.46 (16), p.25430-25439
Main Authors: Yang, Kun, Zhou, Yan-Zhe, Liu, Min, Song, Jin-Bing, Deng, Chun-Ming
Format: Article
Language:English
Subjects:
Electrical-thermal performance
Heater coating
MoSi2
Plasma spray
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Summary:Rollers covered with a thermally sprayed heater coating are an alternative to conventional stream heated and electromagnetic induction heated rollers. In this study, a heater coating was developed using a combination of a thermally sprayed NiAl bonding layer, an MgAl2O4 insulating layer, and an MoSi2-based conductive layer; for comparison, an optional thin MgAl2O4 top layer was applied to provide corrosion and wear protection. The microstructures and characteristics, particularly the electrical-thermal performance, were systematically investigated. The MgAl2O4 layer was found to provide excellent high-temperature insulation performance. Thermo-cycling tests indicate the MoSi2-based coating can be heated to 320 °C with a relatively uniform temperature distribution at the roller surface. The addition of the top layer as a protective mask is beneficial to the heating stability, and NiCr added as a bonding phase in the conductive layer significantly improves the electrical-thermal performance.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2020.07.013