TY - JOUR
T1 - Preparation and study of porous transition metal-doped coatings on electric vacuum ceramics for suppressing surface flashover
AU - Zhong, Dengqi
AU - An, Baijiang
AU - Zhao, Weiwei
AU - Li, Shengtao
AU - Wei, Fenyan
AU - Tian, Yanyu
AU - Dou, Shumei
AU - Li, Huiqin
N1 - Publisher Copyright:
Copyright © 2026. Published by Elsevier Ltd.
PY - 2026/2
Y1 - 2026/2
N2 - Insulation failure caused by surface flashover is the main problem of high-voltage equipment. In this study, screen printing and solid-state sintering techniques were adopted to prepare Cr2O3-based composite coatings containing elements such as Cu, Mg, Mn, Ti, and Zn on the surface of alumina ceramics, in order to enhance their compressive resistance. SEM shows that Cr/Cu coating has the largest uniform porosity, AFM indicated that the roughness of the Cu2O coating was increased by 60 % compared with the control group. The SPD test shows the Cr/Cu coating has the slowest potential decay, with a deep trap level of 0.96 eV and density of 5.12 eV-1m−3, and a shallow trap level of 0.78 eV with a density of 2.36 eV-1m−3. By changing the surface and electrical properties of Al2O3 ceramics to improve its flashover performance, it provides an effective strategy for vacuum insulation applications.
AB - Insulation failure caused by surface flashover is the main problem of high-voltage equipment. In this study, screen printing and solid-state sintering techniques were adopted to prepare Cr2O3-based composite coatings containing elements such as Cu, Mg, Mn, Ti, and Zn on the surface of alumina ceramics, in order to enhance their compressive resistance. SEM shows that Cr/Cu coating has the largest uniform porosity, AFM indicated that the roughness of the Cu2O coating was increased by 60 % compared with the control group. The SPD test shows the Cr/Cu coating has the slowest potential decay, with a deep trap level of 0.96 eV and density of 5.12 eV-1m−3, and a shallow trap level of 0.78 eV with a density of 2.36 eV-1m−3. By changing the surface and electrical properties of Al2O3 ceramics to improve its flashover performance, it provides an effective strategy for vacuum insulation applications.
KW - Alumina ceramics
KW - Metal oxide
KW - Surface potential attenuation
KW - Surface resistivity
UR - https://www.scopus.com/pages/publications/105028909886
U2 - 10.1016/j.matdes.2026.115456
DO - 10.1016/j.matdes.2026.115456
M3 - 文章
AN - SCOPUS:105028909886
SN - 0264-1275
VL - 262
JO - Materials and Design
JF - Materials and Design
M1 - 115456
ER -