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Microplasma-sprayed multilayer coatings for electric heating elements

Kaliuzhnyi Sergii, Alontseva Dayra, Voinarovych Sergey, Kyslytsia Oleksandr, Khozhanov Aleksandr, Łatka Leszek, Faizrakhmanov Zulfat, Bektasova Gulsym

Materials Science Poland

2022

Vol. 40, No. 4

158--170

The paper presents new results on the application of microplasma spraying (MPS) for manufacturing electric heating elements (EHEs) consisting of a St3 steel plate (the substrate) with a sprayed electrically insulating Al2O3 sublayer (400±50 μm thick) and TiO2 electric heating tracks (4 mm width; 150±50 μm thickness). Measurements of the temperature of the multilayer coating with a thermal imager enabled determination of the temperature distribution over the surface of the EHE. The electric strength and conductivity tests showed the efficiency of the sprayed EHEs up to a temperature of 200°C. The results of analysis of the causes of material losses during MPS of electric heating tracks (TiO2) are presented, and the optimal parameters for efficient MPS of coatings in the form of narrow tracks on steel substrates are determined. Using regression analyses, the equation for the influence of MPS parameters on the coating transfer efficiency (CTE) is obtained. Process parameters such as the electric current and the plasma-forming gas flow rate have been found to have the greatest influence on the CTE. In the experiment, a high efficiency of the sprayed material during MPS of electric heating tracks of TiO2 powder was established (the maximum CTE reached 89%), which indicates the prospects for using MPS technology in the production of EHEs for DC electric heating and for maintaining the temperature of product surfaces up to 200°C.

Dynamika elektrycznych elementów grzejnych powszechnego użytku

Chamera S.

Ciepłownictwo, Ogrzewnictwo, Wentylacja

2017

T. 48, nr 10

403--406

W artykule dokonano charakterystyki elektrycznych elementów grzejnych stosowanych powszechnie w branży AGD lub technice grzewczej, a także w układach sterowania niektórych procesów technologicznych. Szczególną uwagę zwrócono na różnice pojemności cieplnej wybranych elementów grzejnych, która ma istotny wpływ na energochłonność procesów grzewczych w stanach przejściowych.

The paper contains characteristics of commonly used electric heating elements. Such elements are used for example in household appliances or heating technology. The greatest attention is paid to the heat capacity differences of selected heating elements. This parameter has a significant impact on energy consumption in transient states.