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Phase transformations in Ti(1-x)Al(x)N coatings
2006 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This project focuses on phase transformations in Ti1-xAlxN coatings and particularly on their thermal aspect. SECO Tools AB Ti1-xAlxN films deposited by arc evaporation with 50 and 66 at.% aluminium have been investigated. This report presents an effective way to separate the ceramic coating from its substrate without altering the ceramic. EDX analysis and SEM pictures characterise the composition and the morphology of the coating powder. XRD patterns were used to confirm that the main growing orientation of this material was (002) and also to calculate the lattice parameters (4.20 Å and 4.17 Å) for respectively x = 0.50 and x = 0.66 films. DSC measurements were carried out on both compositions at different heating rates (5, 10, 15, 20 and 30 K/min). Results showed that three exothermic peaks appeared respectively between 600°C - 900°C, 900°C - 1100°C and 1100° C - 1300°C on each curve. It was also proved that the peak temperatures were increasing with increasing heating rates. Activation energies were calculated for each one of these thermally activated phenomena and the influence of the composition on the material thermal response was also illustrated.

Place, publisher, year, edition, pages
2006.
Keyword [en]
Technology, Ti(1-x)Al(x)N, phase transformations, coatings, thin films, DSC, XRD, cutting tools
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-49164ISRN: LTU-EX--06/246--SELocal ID: 68d172bd-984e-40db-ada2-acb06b72d673OAI: oai:DiVA.org:ltu-49164DiVA: diva2:1022510
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Supervisors
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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  • apa
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