Microplasma-sprayed multilayer coatings for electric heating elements

Abstract The paper presents new results on the application of microplasma spraying (MPS) for manufacturing electric heating elements (EHEs) consisting a St3 steel plate (the substrate) with sprayed electrically insulating Al 2 O 3 sublayer (400±50 μm thick) and TiO tracks (4 mm width; 150±50 thickness). Measurements temperature multilayer coating thermal imager enabled determination distribution over surface EHE. strength conductivity tests showed efficiency EHEs up to 200°C. analysis causes material losses during MPS (TiO ) are presented, optimal parameters efficient coatings in form narrow substrates determined. Using regression analyses, equation influence transfer (CTE) is obtained. Process such as current plasma-forming gas flow rate have been found greatest CTE. In experiment, high powder was established maximum CTE reached 89%), which indicates prospects using technology production DC maintaining product surfaces