Oxidation behavior and electrical properties of metal interconnects with Ce-doped Ni–Mn spinel coatings. Issue 7 (1st April 2022)

• Record Type: Journal Article
• Authors: Zhang, Yong; Zhang, Yutao; Wu, Caihong; Yang, Yiting; Li, Qiang; Chen, Yongnan
• Is Part Of: Ceramics international. Volume 48:Issue 7(2022)
• Page Start: 9550
• Page End: 9557
• Publication Date: 2022-04-01
• Subjects: Oxidation behavior -- Electrical properties -- Metal interconnects -- Ce-doped spinel coating; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.12.153
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To improve the high-temperature oxidation resistance and electrical conductivity of ferritic stainless steels, protective Ce-doped NiMn2 O4 spinel coatings were fabricated on the surface of SUS430 steel by electrophoretic deposition (EPD). The phase structure and microstructure of Ce-doped NiMn2 O4 in both powder and coating forms were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The high-temperature oxidation of the NiMn2 O4 spinel coating before and after Ce doping in the air at 800 °C for 168 h was studied by weight gain experiments. The area-specific resistance (ASR) of coatings was measured by a standard four-probe method. It was found that the Ce-doped NiMn2 O4 spinel powder displayed a stable structure, high crystallinity, fine grain size, and decreased agglomeration when the Ce content was fixed at 0.05 mol∙L −1 . The oxidation kinetics of NiMn2 O4 -coated SUS430 steel before and after Ce doping obeyed a parabolic law with parabolic rate constants of 4.58 × 10 −15 g 2 cm −4 s −1 and 1.83 × 10 −15 g 2 cm −4 s −1, respectively. When oxidized at 800 °C for 50 h, the ASR value of the coated samples before and after Ce doping stabilized at about 15.2 mΩ∙cm 2 and 14.5 mΩ∙cm 2, respectively. This work demonstrated that the Ce-doped NiMn2 O4 spinel coating improved the high-temperature oxidation resistance and the electrical conductivity of metal interconnects.