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(a) A photo of a mesh-type heating coil. (b) SEM image and EDS elemental maps (Fe, Cr, and Al) of the heating coil. (c) The atomic concentrations of the heating coil obtained from the EDS analysis (b). (d) A photo of a coil head. (e) SEM image and EDS elemental maps (Ni, Cu, and Zn) of the surface of the coil head. (f) The atomic concentrations of the coil head obtained from the EDS analysis (e).
