Study of oxidation of Fe-Cr-ZrO₂ alloy using high energy milling and ultrasonic method using thermogravimetry

Thermogravimetric tests have been carried out to study the oxidation behavior of high-temperature steel Fe-Cr-ZrO₂ as its application as high temperature components. This paper studied about the effects of chromium percentage in Fe-Cr-ZrO₂ alloys with 20Cr and 25Cr are prepared using High Energy Milling (HEM) method and the ultrasonic sonochemistry method for 20 hours. The thermogravimetric test was carried out with Magnetic Suspension Balance (MSB) at a temperature of 700 °C for 400 minutes. Scanning Electron Microscopy Energy Dispersive X-Ray Spectroscope (SEM-EDS) are used to analyze the thickness and element content of the oxide layer. It was found that the alloy with 25Cr had a lower oxide layer compared to the 20Cr alloy. The different synthesis methods also influenced the oxide layer. It was found that the alloy oxide layer prepared by the ultrasonic sonochemistry synthesis method had a higher mass gain than the alloy prepared by the HEM method. In addition, the contents of O and C in the alloy prepared by the ultrasonic sonochemistry method is higher than in alloys prepared by the HEM method synthesis. X-Ray Diffraction (XRD) analysis showed Cr₂O₃ phase beside Fe phase. (author)