Thermally sprayed multilayer ceramicheating elements
Authors: Dipl.-Ing. (FH) Stefan Scheitz, Dr. Filofteia-Laura Toma, Dr.-Ing. Lutz-Michael Berger, Dipl.-Ing. Roberto Puschmann, Dr. Viktar Sauchuk, Dr.-Ing. Mihails Kusnezoff
Thermally sprayed multilayer heating elements composed of ceramic electrically
insulating and conductive layers can be used effectively for the tempering and
heating of machine and system components. In humid environments spinel
(MgAl2O4) layers are preferable to electrically insulating APS- and HVOF-sprayed
Al2O3 layers. Depending on the operating
temperature, heating layers made from
titanium suboxides (TiOx) or from compositions
in the Cr2O3-TiO2 system can
be used. These ceramic layers offer a
number of advantages over metal heating
layers, including a lower thermal expansion
coefficient mismatch between
layers. Reoxidation to titanium dioxide
limits the upper operating temperature
of titanium suboxide heating layers in
air to approximately 250 °C. Heating
layers made from materials in the Cr2O3-
TiO2 system have higher maximum operating
temperatures. A coated roller is
used to demonstrate the functioning of
the ceramic multilayer heating elements
at an operating temperature of 300 °C.
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