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High pressure and high temperature behaviour of TiAlN coatings deposited on c-BN based substrates
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Element Six, Sweden.
SECO Tools, Sweden.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

High pressure and temperature experiments of two different arc evaporated TiAlN alloys on polycrystalline cubic BN substrate reveal a strong influence of pressure on the decomposition rate of TiAlN. This pressure induced enhanced stability in combination with intact interface between the coatings and the substrate predicts enhanced endurance of TiAlN coated BN cutting tools.

Keyword [en]
Materials science; coatings; thin films; TiAlN; HPHT; spinodal decomposition; BELT-press
National Category
Physical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-112212OAI: oai:DiVA.org:liu-112212DiVA: diva2:764283
Note

Available from: 2014-11-18 Created: 2014-11-18 Last updated: 2014-11-20Bibliographically approved
In thesis
1. TiAlN-based Coatings at High Pressures and Temperatures
Open this publication in new window or tab >>TiAlN-based Coatings at High Pressures and Temperatures
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

TiAlN and TiAlN-based coatings that are used of relevance as protection of cutting tool inserts used in metal machining have been studied. All coatings were deposited by reactive cathodic arc evaporation using industrial scale deposition systems. The metal content of the coatings was varied by using different combinations of compound cathodes. The as-deposited coatings were temperature annealed at ambient pressure and in some cases also at high pressure. The resulting microstructure was first evaluated through a combination of x-ray diffraction and transmission electron microscopy. In addition, mechanical properties such as hardness by nanoindentation were also reported.

TiAlN coatings with two different compositions were deposited on polycrystalline boron nitride substrates and then high pressure high temperature treated in a BELT press at constant 5.35 GPa and at 1050 and 1300 °C for different times.

For high pressure high temperature treated TiAlN it has been shown that the decomposition is slower at higher pressure compared to ambeint pressure and that no chemical interaction takes place between TiAlN and polycrystalline cubic boron nitride during the experiments. It is concluded that this film has the potential to protect a polycrystalline cubic boron nitride substrate during metal machining due to a high chemical integrity.

TiZrAlN coatings with different predicted driving forces for spinodal decomposition were furthermore annealed at different temperatures. For this material system it has been shown that for Zr-poor compositions the tendency for phase separation between ZrN and AlN is strong at elevated temperatures and that after spinodal decomposition stable TiZrN is formed.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 47 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1690
Keyword
Materials science; thin films; coatings; spinodal decomposition; TiAlN, TiZrAlN; HPHT; high pressure high temperature; BELT-press; transmission electron microscopy; x-ray diifraction; microhardness
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-112213 (URN)10.3384/lic.diva-112213 (DOI)LIU-TEK.LIC-2014:122 (Local ID)978-91-7519-186-7 (ISBN)LIU-TEK.LIC-2014:122 (Archive number)LIU-TEK.LIC-2014:122 (OAI)
Presentation
2014-12-17, Röntgen, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 15:43 (English)
Opponent
Supervisors
Funder
Knowledge Foundation
Available from: 2014-11-20 Created: 2014-11-18 Last updated: 2014-11-20Bibliographically approved

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Pilemalm, RobertZhu, JianqiangOdén, Magnus

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