In this course, students learn the basic thermodynamics and kinetics for understanding of oxidation of metals at high temperature. In the part of basic thermodynamics, students acquire the method of constructing the Ellingham diagram and estimate the chemical stability of metals and oxides by the diagram. In the part of kinetics, students learn the mechanism of scale formation and Wagner’s theory for parabolic scale growth. Finally, students improve understanding of basic thermodynamics and kinetics for high temperature oxidation of metals through the examples of degradation of metals in the industrial processes.
This course provides students with basics of thermodynamics and kinetics for high temperature oxidation of metals. By attending this course, students can understand the degradation mechanism of metals at high temperature and will be able to estimate degradation behavior from given materials and environments. Instructors hope that students improve understanding of degradation of metals in the industrial high temperature processes.
By the end of this course, students will be able to:
1) Explain about oxidation of metals at high temperature and its industrial importance.
2) Construct Ellingham diagram and evaluate the chemical stability of metals and oxides by the diagram.
3) Explain the mechanism of scale formation and estimate parabolic rate constant of scale formation by Wagner’s theory.
4) Estimate degradation behavior of metals at high temperature from given materials and environments.
Metals, High Temperature Oxidation, Ellingham diagram, Mechanism of Scale growth, Parabolic rate law, Wagner's theory
|Intercultural skills||Communication skills||Specialist skills||Critical thinking skills||Practical and/or problem-solving skills|
Each class consists of lecture and exercise.
|Course schedule||Required learning|
|Class 1||Introduction to high temperature oxidation of metals|
|Class 2||Ellingham diagram (Part 1)||Construct Ellingham diagram and estimate the stability of metals and oxides by the diagram|
|Class 3||Ellingham diagram (Part 2)||Construct Ellingham diagram considering activity and estimate the stability of alloys and oxides by the diagram|
|Class 4||Scale growth and its mechanism||Understand the mechanism and rate determining step of scale growth|
|Class 5||Parabolic scale growth and Wagner's theory||Understand Wagner's theory, defect structure and diffusion in oxides|
|Class 6||Analytical methods for evaluating oxide scales on metals||Understand analytical methods for evaluating oxide scales|
|Class 7||Degradation of metals at high temperature in the industrial processes|
|Class 8||Test level of understanding with exercise problems||Estimate degradation behavior of metals at high temperature from given materials and environments.|
Slides and handout in each class.
Students' knowledge of Ellingam diagram, mechanism of scale growth, Wagner's theory, analytical methods for evaluating oxide scale and their ability to apply them to problems will be assessed.
Exercise in Class 8 (30%) and Final exam. (70%)
Students must have successfully completed 'Themodynamics of Materials' (MAT.A203.R) or have equivalent knowledge.