Ing Ind - Inf (Mag.)(ord. 270) - MI (491) MATERIALS ENGINEERING AND NANOTECHNOLOGY - INGEGNERIA DEI MATERIALI E DELLE NANOTECNOLOGIE
054336 - SURFACE TECHNOLOGY
The course is aimed at describing and explaining important surface-modification techniques used in the industrial practice. All the features of the single technique are examined, including the basic principles, operating parameters, industrial equipment, monitoring methods, quality control and industrial applications.
The course is also aimed at describing the variety of coating structures that can be produced by many of these techniques and the outstanding properties that can be achieved. The relationship between surface properties imparted by the specific treatment and the service performance of the component is also considered.
Risultati di apprendimento attesi
Upon completion of the course, the student will
know the main components of a vacuum production system and how to connect them for achieving the required vacuum range;
know the physical principles, the operating conditions and the control methods of the main industrial processes in the field of Physical Vapour Deposition (PVD);
know the structure and properties of advanced coatings produced by PVD techniques;
know and understand the main chemical processes aimed at producing diffusional coatings , including the plasma-assisted techniques;
know and understand the relationship between coating properties and service performance of the coated parts;
be able to apply the above described knowledge for the purpose of designing a surface-modification treatment suitable to attain the desired properties in industrial applications.
These learning outcomes are expected to provide the students with adequate knowledge tools and critical approach for their future activity related to surface-modification processes based on active gas species.
The main topics of the course are
Vacuum technology: mean free path, collision cross section, vacuum ranges; molecular flow, throughput and conductance; pumping speed, outgassing and evacuation time; preliminary pumps and high-vacuum pumps; vacuum gauges.
Microstructure of coatings and films; structure zone models; coalescence in two- and three- dimensional systems; sintering of porous bodies, solid-state and pressure-assisted processes.
Physical vapour deposition (PVD). Vacuum evaporation: vaporization rate and space distribution of evaporated atoms; thickness uniformity and coating purity; evaporation of compounds and alloys; resistively-heated sources and electron beam sources; coating structure; industrial equipment and process control; industrial applications and case studies. Sputter deposition: introduction to plasma discharges; sputter yield, direct-current and radio-frequency sputtering; magnetic confinement; reactive sputtering; process control and industrial applications. Cathodic arc deposition: arc discharge and distribution of emitted particles; steered arc and filtered cathodic arc; reactive processes; industrial applications; comparison with traditional and emerging PVD techniques.
Advanced ceramic coatings: coating properties and composition; failure modes; load-carrying capacity; graded layers, multilayers, superlattices, nanocomposites, duplex treatments; self-lubricating layers, diamond-like carbon; plasma-assisted chemical vapour deposition; hardness measurement and indentation.
Performance of the treated components: sources of residual stress in coatings and measurement methods; wear and fatigue resistance of coated parts.
Cold plasma treatments at atmospheric pressure: fundamentals, devices and applications.
Thermochemical treatments: carburizing techniques; gas carburizing atmospheres; main carbon-transfer reactions; carbon potential control; plasma carburizing. Gas nitriding and structure of the nitrided layers; nitriding potential and process control; post-oxidation treatments; plasma nitriding, comparison of different techniques.
A background in chemistry and physics is required.
Modalità di valutazione
The examination will be an oral discussion about the course topics, chosen by the examiner so that different parts of the course syllabus are involved.
The student must be also able to clearly describe and critically discuss the proposed topics, highlighting the assumptions, critical points, physical meaning and following consequences, including the mathematical approach where needed. The student should also be able to apply the theoretical knowledge to solving specific problems typically encountered in the industrial practice.
M. Ohring, Materials Science of Thin Films, Editore: Academic Press, Anno edizione: 2002
B. Bhushan Ed., Modern Tribology Handbook, Editore: CRC Press, Anno edizione: 2000
G.E. Totten Ed., The Materials Steel heat treatments: metallurgy and technologies, Editore: Taylor & Francis, Anno edizione: 2007
Nessun software richiesto
Tipo Forma Didattica
Ore di attività svolte in aula
Ore di studio autonome
Laboratorio Di Progetto
Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese