Protection and Degradation of Surfaces

Recommended Prerequisites

Not applicable.

Teaching Methods

In a first part of the course the procedure to performing the materials selection is presented. In this phase, theoretical courses are complemented with theoretical-practical classes where specific examples of each step of selection procedure are taught to the students. The students are also invited to solve practical problems based either on experimental results or in results from the literature.

Learning Outcomes

The course has the main objective of forming students in the most different variants of the surface modification technologies for improving wear and corrosion behaviour of materials.

This course intends to supply the student with the ability to:

1 – select the best procedure for surface modification in order to achieve the envisaged objectives considering not only technical problems but also processing costs.

2 – achieve a basic knowledge level about surface modification technologies which allow the students to easily access future detailed information about each one.

3 – be motivated for new techiques with potential to be developed worldwide.

4 – analyse and understand the main phenomena intervening on the degradation of materials, mainly those related with wear and corrosion

5 – understand the importance of the technologies of surface modification.

Work Placement(s)

No

Syllabus

1. Introduction and motivation – modification of surfaces; advantages and drawbacks of these technologies; economical aspects. 2. Surface modification processes – with and without changes in the chemical composition; coatings (atomic deposition; particles deposition; diffusion; bulk coatings); selection of a coating technology; main steps in coatings deposition; coatings applications. 3. Surface treatments for tribological applications – mechanical; thermal; by surface melting; thermochemical (cementation, nitruration and carbonitruration); ionic implantation; chemical treatments; welding; plasma spraying; CVD and PVD. 4. Sputtering – reactive sputtering; residual stresses; adhesion. 5. Coatings for tribological applications – nucleation / structure; chemical composition; morphology. 6. Wear – main wear types; methods for wear evaluation; wear mechanisms; 7. Corrosion – the corrosion from the electrochemical point of view; main types of corrosion and methods for their prevention.

Head Lecturer(s)

Bruno Miguel Quelhas de Sacadura Cabral Trindade

Assessment Methods

Assessment
Frequency (Laboratory works) - 50.0%, Exam - 50.0%.: 100.0%

Bibliography

Slides of classes.

Review and regular scientific and technical papers on Surface Modification Technologies.