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Synthesis and phase development in the Ct-Al-N system
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-3661-9262
Monash University, Melbourne, VIC.
2009 (English)In: Mechanical properties and processing of ceramic binary, ternary and composite systems: a collection of papers presented at the 32nd International Conference on Advanced Ceramics and Composites, January 27-February 1, 2008, Daytona Beach, Florida / [ed] Jonathan Salem; Greg Hilmas; William Fahrenholtz, Hoboken, NJ: John Wiley & Sons, 2009, p. 3-12Conference paper, Published paper (Refereed)
Abstract [en]

The ternary nitride system Cr-Al-N has been investigated by sintering different powder compositions. The powder compositions belong to four groups, AIN- + Cr-powder (5 compositions between 20-90 molar% AlN), Al- + Cr 2N-powder (5 compositions between 15-80 molar% Cr2N), AlN-+ Cr2N-powder (50- and 90 molar% Cr2N) and Al- + Cr-powder. The powders were dry mixed and pressed into pellets by uniaxial pressing followed by cold isostatic pressing (ClP). Sintering took place in a graphite lined reaction bonding furnace under nitrogen atmosphere at three different temperatures, 1350°C, 1500°C and 1800°C and in an alumina tube furnace in order to avoid access to carbon. Holding times were varied, from 2 hours up to 72 hours. The phase development was evaluated by thermal analysis and XRD. CrAlN was formed at 1350°C but decomposed at higher temperatures. Both pure Al and Cr-powder were prone to react with carbon in the graphite furnace. Thermal analysis showed a sublimation of Cr2N at temperatures around 1050°C and nitridation of pure Al-powder between 680-750°C and of pure Cr-powder between 610-1080°C. Samples with pure Al-powder showed a very large expansion due to melting of aluminium in combination with nitridation. AIN was found to be more stable than Cr 2N at higher temperatures and longer holding times. The mixtures of Al-+Cr-powder produced an intermediate Al-Cr-phase.

Place, publisher, year, edition, pages
Hoboken, NJ: John Wiley & Sons, 2009. p. 3-12
Series
Ceramic Engineering and Science Proceedings, ISSN 0196-6219 ; 29:2
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-29264DOI: 10.1002/9780470456361.ch1Local ID: 2ae1f7e0-2f43-11de-bd0f-000ea68e967bISBN: 978-0-470-34492-7 (print)OAI: oai:DiVA.org:ltu-29264DiVA, id: diva2:1002487
Conference
International Conference on Advanced Ceramics and Composites : 27/01/2008 - 01/02/2008
Note
Godkänd; 2009; 20090422 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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