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Theoretical and exp...
Theoretical and experimental studies of ternary and quaternary nitrides for machining and thermoelectric materials
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- Pilemalm, Robert, 1983- (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Eklund, Per, Docent, 1977- (thesis advisor)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Simak, Sergei I, Professor, 1967- (thesis advisor)
- Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten
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- Sanyal, Biplap, Docent (opponent)
- Department of Physics and Astronomy, Materials Theory, Uppsala University
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(creator_code:org_t)
- ISBN 9789176851142
- Linköping : Linköping University Electronic Press, 2019
- English 50 s.
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Series: Linköping Studies in Science and Technology. Dissertations, 0345-7524 ; 1983
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Abstract
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- Nitrides are used as coatings and thin films for a wide range of applications. The study and use of nitrides in the recent decades have shifted towards ternary, quaternary or even higher order (complex) nitrides. There is an interest to use ternary and quaternary nitrides for machining and thermoelectric materials, because it gives the possibility to choose composition and thereby design the materials properties. This thesis presents research results on TiAlN and and TiAlN-based coatings that are used as hard coatings for machining and on ternary scandium nitrides that are of interest for thin films for thermoelectric applications. The high-pressure high-temperature behavior of cubic TiAlN deposited on cubic boron nitride has been experimentally studied. It has been shown that the spinodal decomposition, which means decomposition into cubic domains enriched in TiN and AlN, is delayed as a result of high pressure compared to ambient pressure. No chemical interaction between coating and substrate occurs. TiZrAlN has been theoretically and experimentally studied at high temperature. The results show that the when Zr-content is decreased and the Al-content is increased the decomposition route changes from nucleation and growth to spinodal decomposition. The microstructure evolution with temperature depends on the initial composition. In the case where the decompositon starts with only spinodal decomposition the microstructure at 1100 °C consists of domains that are larger than in the case where the decomposition occurs by nucleation and growth. ScMN2 (M=V, Nb, Ta) phases have been experimentally demonstrated for M=Nb and Ta in a few studies, but have not been much investigated. In this theseis, their crystal structure, stability, elastic properties, electronic structure and thermoelectric properties have been studied. At 0 K and 0 GPa it has been shown that these three phases are thermodynamically and elastically stable. Additionally, these are narrow-bandgap semiconductors and their thermoelectric properties can be tuned by doping. Pressure has a stabilizing effect on these structures. When pressure increases from 0-150 GPa the elastic constants and moduli increases in the range 53-317 %.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Keramteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Ceramics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Keyword
- materials science; thin film physics; nitrides
- machining; thermoelectrics
- materialvetenskap; tunnfilmsfysik; nitrider; metallbearbetning; termoelektricitet
Publication and Content Type
- vet (subject category)
- dok (subject category)
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