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Århammar, Cecilia
Publications (5 of 5) Show all publications
Chatzigeorgiou, E., Århammar, C., Gråsjö, J., Ekholm, V., Såthe, C., Olovsson, W., . . . Rubensson, J.-E. (2019). Soft X-ray Spectroscopy on  amorphous and crystalline magnesium carbonate. In: EUROMAT 2019: . Paper presented at EUROMAT 2019, 1-5 September 2019, Stockholm,. , Article ID 14135.
Open this publication in new window or tab >>Soft X-ray Spectroscopy on  amorphous and crystalline magnesium carbonate
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2019 (English)In: EUROMAT 2019, 2019, article id 14135Conference paper, Oral presentation with published abstract (Refereed)
National Category
Nano Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-395335 (URN)
Conference
EUROMAT 2019, 1-5 September 2019, Stockholm,
Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17
von Fieandt, L., M'Saoubi, R., Schwind, M., Kaplan, B., Århammar, C. & Jansson, B. (2018). Chemical Interactions Between Cemented Carbide and Difficult-to-Machine Materials by Diffusion Couple Method and Simulations. Journal of phase equilibria and diffusion, 39(4), 369-376
Open this publication in new window or tab >>Chemical Interactions Between Cemented Carbide and Difficult-to-Machine Materials by Diffusion Couple Method and Simulations
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2018 (English)In: Journal of phase equilibria and diffusion, ISSN 1547-7073, Vol. 39, no 4, p. 369-376Article in journal (Refereed) Published
Abstract [en]

A simple and efficient diffusion couple method is utilized to study the chemical interactions between cemented carbide cutting tools and difficult-to-machine materials (Ti, Ti-6Al-4V, Ni, Inconel 718, Fe, and AISI 316L). The experimental results and simulations probe different chemical interactions between the cemented carbide and work materials. In particular, the formation of a thick TiC layer is observed at the cemented carbide/Ti and Ti-6Al-4V interface while eta-phase is formed at the interface between the cemented carbide and work materials Inconel 718, Fe and AISI 316L. Pure titanium and Ti-6Al-4V both interact strongly with the tool causing formation of TiC and dissolution of WC-grains. Experiments and diffusion simulations confirm bcc-W formation and progressive diffusion of W into bcc-Ti. For both Ti and Fe work materials a dense band of carbides (WC + eta or WC + TiC) forms at the interface, effectively inhibiting further diffusion. Ni does not form any stable carbide and lowers the eta-phase limit in terms of carbon content, wherefore diffusion can occur freely. The diffusion couple method used in this work, corroborated by DICTRA simulations should serve as a useful tool in the detailed analysis of worn tools where chemical wear is dominant.

Place, publisher, year, edition, pages
SPRINGER, 2018
Keywords
cemented carbide, DICTRA modeling, diffusion couples, machining
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:uu:diva-363060 (URN)10.1007/s11669-018-0639-y (DOI)000441127400002 ()
Available from: 2018-10-18 Created: 2018-10-18 Last updated: 2018-10-18Bibliographically approved
Århammar, C., Grahn, A., Vall, M., Strömme, M. & Boman, M. (2016). Functionalization of amorphous magnesium carbonate by Atomic Layer Deposition of (3-Aminopropyl)trietoxysilane (APTES) and (3-aminopropyl)trimethoxysilane (APTMS). In: 43rd ICMCTF International conference on Coatings and Thin Films: . Paper presented at 43rd ICMCTF International conference on Coatings and Thin Films, April 25-29, 2016, San Diego, USA (pp. 8). , B2-2-8
Open this publication in new window or tab >>Functionalization of amorphous magnesium carbonate by Atomic Layer Deposition of (3-Aminopropyl)trietoxysilane (APTES) and (3-aminopropyl)trimethoxysilane (APTMS)
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2016 (English)In: 43rd ICMCTF International conference on Coatings and Thin Films, 2016, Vol. B2-2-8, p. 8-Conference paper, Oral presentation with published abstract (Refereed)
National Category
Nano Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-287967 (URN)
External cooperation:
Conference
43rd ICMCTF International conference on Coatings and Thin Films, April 25-29, 2016, San Diego, USA
Available from: 2016-04-27 Created: 2016-04-27 Last updated: 2016-11-30
Blomqvist, A., Århammar, C., Pedersen, H., Silvearv, F., Norgren, S. & Ahuja, R. (2011). Understanding the catalytic effects of H(2)S on CVD-growth of alpha-alumina: Thermodynamic gas-phase simulations and density functional theory. Surface & Coatings Technology, 206(7), 1771-1779
Open this publication in new window or tab >>Understanding the catalytic effects of H(2)S on CVD-growth of alpha-alumina: Thermodynamic gas-phase simulations and density functional theory
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2011 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 206, no 7, p. 1771-1779Article in journal (Refereed) Published
Abstract [en]

The catalytic effect of H(2)S on the AlCl(3)/H(2)/CO(2)/HCl chemical vapor deposition (CVD) process has been investigated on an atomistic scale. We apply a combined approach with thermodynamic modeling and density functional theory and show that H(2)S acts as mediator for the oxygenation of the AI-surface which will in turn increase the growth rate of Al(2)O(3). Furthermore we suggest surface terminations for the three investigated surfaces. The oxygen surface is found to be hydrogenated, in agreement with a number of previous works. The aluminum surfaces are Cl-terminated in the studied CVD-process. Furthermore, we find that the AlClO molecule is a reactive transition state molecule which interacts strongly with the aluminum and oxygen surfaces.

Keywords
CVD, H(2)S, First principles, Thermodynamic modeling
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-168121 (URN)10.1016/j.surfcoat.2011.09.018 (DOI)000298711500040 ()
Available from: 2012-02-07 Created: 2012-02-06 Last updated: 2017-12-08Bibliographically approved
Blomqvist, A., Århammar, C., Pedersen, H., Silvearv, F., Norgren, S. & Ahuja, R. (2011). Understanding the catalytic effects of H2S on CVD-growth of α-alumina: Thermodynamic gas-phase simulations and density functional theory. In: Proceedings of the 38th International Conference on Metallurgical Coatings and Thin Films (ICMCTF) — ICMCTF 2011. Paper presented at The 38th International Conference on Metallurgical Coatings and Thin Films (ICMCTF), May 2 to 6, 2011, San Diego, CA, USA (pp. 1771-1779).
Open this publication in new window or tab >>Understanding the catalytic effects of H2S on CVD-growth of α-alumina: Thermodynamic gas-phase simulations and density functional theory
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2011 (English)In: Proceedings of the 38th International Conference on Metallurgical Coatings and Thin Films (ICMCTF) — ICMCTF 2011, 2011, p. 1771-1779Conference paper, Published paper (Refereed)
Abstract [en]

The catalytic effect of H2S on the AlCl3/H2/CO2/HCl chemical vapor deposition (CVD) process has been investigated on an atomistic scale. We apply a combined approach with thermodynamic modeling and density functional theory and show that H2S acts as mediator for the oxygenation of the Al-surface which will in turn increase the growth rate of Al2O3. Furthermore we suggest surface terminations for the three investigated surfaces. The oxygen surface is found to be hydrogenated, in agreement with a number of previous works. The aluminum surfaces are Cl-terminated in the studied CVD-process. Furthermore, we find that the AlClO molecule is a reactive transition state molecule which interacts strongly with the aluminum and oxygen surfaces.

Series
Surface and Coatings Technology ; 206:7
National Category
Natural Sciences
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-160243 (URN)10.1016/j.surfcoat.2011.09.018 (DOI)
Conference
The 38th International Conference on Metallurgical Coatings and Thin Films (ICMCTF), May 2 to 6, 2011, San Diego, CA, USA
Available from: 2011-10-18 Created: 2011-10-18 Last updated: 2013-03-06Bibliographically approved
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