Hard and abrasion resistant materials
We have a large activity on thin film synthesis on hard and abrasion resistant coatings using both solution chemistry and vapour deposition methods such as chemical vapour deposition (CVD) and magnetron sputtering. A major aim with the research is to control the phase composition and microstructure of our materials and establish the correlation between microstructure and properties. We are currently studying a wide range of new types materials such as borides, carbides, nitrides and oxides for different applications.
Multifunctional hard coatings fabricated by Chemical Vapour Deposition
This project involves the industry and the aim is to investigate new synthesis routes to for the next generation hard coatings. In summary the aim of CVD 2.0 is to make:
- New coating materials for a better performance in harsh environments.
- New multifunctional coating architectures, beyond multilayers.
- Design of coating stress in CVD coatings which is tensile at present.
To meet these challenges, we have started an interdisciplinary synthesis program which is a blend of theory, experiments and advanced characterization i.e., we have combined experimental and theoretical competences from chemistry (Uppsala University), physics (Chalmers) and engineering (KTH), to form a team of researchers with a very long experience of thin film research in CVD. CVD 2.0 is partially financed by SSF (RMA15-0048).
Magnetron sputtering of high entropy alloys and other multicomponent materials
High entropy materials are a new group of compounds with at least 5 different elements. It is assumed that solid solutions of these elements can be stabilized by a high entropy of mixing. However, kinetic effects are probably more important to avoid the formation of intermetallic phases and the term multicomponent materials is therefore used in many cases. This type of solid solutions may exhibit unique properties including very high hardness and toughness as well a high corrosion resistance.
We are currently studying thin films several high entropy alloy, carbide and nitride systems mainly based on refractory transition metals. Our interest is both applied and fundamental: ranging from electronic structure and bonding, via phase formation, to functional properties.
Tough optical coatings
Many traditional coatings with optical functionality are sensitive to the environment where they are used, where they may be subjected to mechanical wear, heat, or oxidation. Optical coatings based on nitrides offer materials that are tougher, and can withstand harsher environments. At inorganic chemistry we presently pursue resarch into two groups of such materials:
High-entropy or multi-component nitrides based on transition metals can offer refractory nitride materials with reflective and plasmonic properties, and a high mechanical strength.
AlN-based coatings, can offer transparent, or selectivly absorbing materials high mechanical strenght acheived through refractory covalent nitride phase(s) and a nanocomposite microstructure.
Contact person: Ass. Prof. Erik Lewin