NDLI: Performance Analysis and Modeling of Thermally Sprayed Resistive Heaters

Content Provider	Springer Nature Link
Author	Lamarre, Jean Michel Marcoux, Pierre Perrault, Michel Abbott, Richard C. Legoux, Jean Gabriel
Copyright Year	2013
Abstract	Many processes and systems require hot surfaces. These are usually heated using electrical elements located in their vicinity. However, this solution is subject to intrinsic limitations associated with heating element geometry and physical location. Thermally spraying electrical elements directly on surfaces can overcome these limitations by tailoring the geometry of the heating element to the application. Moreover, the element heat transfer is maximized by minimizing the distance between the heater and the surface to be heated. This article is aimed at modeling and characterizing resistive heaters sprayed on metallic substrates. Heaters were fabricated by using a plasma-sprayed alumina dielectric insulator and a wire flame-sprayed iron-based alloy resistive element. Samples were energized and kept at a constant temperature of 425 °C for up to 4 months. SEM cross-sectional observations revealed the formation of cracks at very specific locations in the alumina layer after thermal use. Finite-element modeling shows that these cracks originate from high local thermal stresses and can be predicted according to the considered geometry. The simulation model was refined using experimental parameters obtained by several techniques such as emissivity and time-dependent temperature profile (infra-red camera), resistivity (four-probe technique), thermal diffusivity (laser flash method), and mechanical properties (micro and nanoindentation). The influence of the alumina thickness and the substrate material on crack formation was evaluated.
Starting Page	947
Ending Page	953
Page Count	7
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	22
Issue Number	6
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2013-06-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	alumina electrically conductive coatings finite-element modeling thermal properties thermal stress Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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