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.

中文翻译：

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用于电热元件的微等离子喷涂多层涂层

该论文介绍了应用微等离子喷涂 (MPS) 制造电热元件 (EHE) 的新结果，该电热元件由 St3 钢板（基板）和喷涂的电绝缘铝组成2个欧3个子层（400±50 μm 厚）和 TiO2个电加热轨道（4 毫米宽；150±50 微米厚）。使用热像仪测量多层涂层的温度可以确定 EHE 表面的温度分布。电气强度和电导率测试显示了喷涂的 EHE 在高达 200°C 的温度下的效率。电加热轨MPS材料损耗原因分析结果（TiO2个) 提出，并确定了钢基板上窄轨道形式涂层的有效 MPS 的最佳参数。使用回归分析，获得了 MPS 参数对涂层转移效率 (CTE) 影响的方程式。已发现电流和等离子体形成气体流速等工艺参数对 CTE 的影响最大。在实验中，在 TiO2 电加热轨道的 MPS 过程中喷涂材料的效率很高2个粉体的建立（最大CTE达到89%），预示着MPS技术在生产直流电加热用EHEs以及维持产品表面温度高达200℃的应用前景。