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The formation of ceramic coatings on metal substrate by cathodic electrolytic deposition (CELD) has received more attention in recent years. But only thin films can be prepared via CELD. Yttrium stabilized zirconia (YSZ) ceramic coatings were deposited on FeCrAl alloy by a novel technique——cathodic micro-arc electrodeposition (CMED). The result shows that, when a high pulse electric field is ap-plied to the cathode which was pre-deposited with a thin YSZ film, dielectric breakdown occurs and micro-arc dis-charges appear. Coatings with reasonably thickness of ~300 mm and crystalline structure can be deposited on the cathode by utilizing the energy of the micro-arc. The thickness of the as-deposited coating is dominated by the voltage and the frequency. Y2O3 is co-deposited with ZrO2 when Y(NO3)3 was added to the electrolyte, which stabilize t-phase, t′- phase and c-phase of ZrO2 at room temperature. The amount of the m-ZrO2 in the coating is diminished by increasing the concentration of Y(NO3)3 in the electrolyte. This report describes the processing of CMED and studies the microstructure of the deposited YSZ coatings.
The formation of ceramic coatings on metal substrates by cathodic electrolytic deposition (CELD) has received more attention in recent years. But only thin films can be prepared via CELD. Yttrium stabilized zirconia (YSZ) ceramic coatings were deposited on FeCrAl alloys by a novel technique --cathodic micro-arc electrodeposition (CMED). The result shows that when a high pulse electric field is ap-plied to the cathode which was pre-deposited with a thin YSZ film, dielectric breakdown occurs and micro-arc dis-charges appear. Coatings with reasonably thickness of ~ 300 mm and crystalline structure can be deposited on the cathode by utilizing the energy of the micro-arc. The thickness of the as-deposited coating is dominated by the voltage and the frequency. Y2O3 is co- deposited with ZrO2 when Y (NO3) 3 was added to the electrolyte, which stabilizes t-phase, t’-phase and c-phase of ZrO2 at room temperature. The amount of the m-ZrO2 in the coating is diminished by increasing the concentrat ion of Y (NO3) 3 in the electrolyte. This report describes the processing of CMED and studies the microstructure of the deposited YSZ coatings.