Microstructure and Isothermal Oxidation of Ir-Rh Spark Plug Electrodes.
Materials (Basel)
; 12(19)2019 Oct 01.
Article
in En
| MEDLINE
| ID: mdl-31581583
ABSTRACT
High-temperature oxidation tests were performed on pure iridium, rhodium, and the iridium alloys, IrRh10, IrRh25, and IrRh40, at 1100 °C in a stable air environment for 60 h. The results of the oxidation were analyzed by X-ray photoelectron spectroscopy (XPS). Microstructural changes of the Ir-Rh alloys were characterized by scanning electron microscopy (SEM). XPS analysis results show that the main oxide of the Ir-Rh alloy in a 1100 °C environment was Rh2O3, and SEM analysis shows that the surfaces of the Ir-Rh alloys after oxidation formed both linear and ellipse-shaped corrosion pits, and had the same direction with the wire-drawing process. The oxidation behavior of Ir-Rh alloys, including the mass change, the reason for the mass loss, and the role of Rh in improving oxidation resistance performance, are discussed.
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Materials (Basel)
Year:
2019
Document type:
Article
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