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Engström, Andreas
Publications (3 of 3) Show all publications
Engström, A. (2014). Reduction Annealing Synthesis of Nanostructured Carbide and Nitride Particulate Composites (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Reduction Annealing Synthesis of Nanostructured Carbide and Nitride Particulate Composites
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis covers reduction-annealing synthesis of nanostructured SiC-TiCN and SiC-TiC particulate composite powders. These were characterized by X-ray diffraction and electron microscopy. In the SiC-TiC powder it was found that TiC could be added in certain amounts by reducing controlled amounts of titanium chloride source followed by a suitable annealing. A transmission electron microscopy showed that TiC formed polyhedrons and SiC formed rods. This was in agreement with a trend towards these crystal shapes, regardless of synthesis method, as found in the literature. In the SiC-TiCN particulate powder, nitration was achieved at low nitrogen concentration. In a scanning electron microscopy study it was seen that SiC formed elongated crystals, while TiCN formed polyhedrons. A gradual nitration of TiC into TiCN was proposed. Nitration was promoted by a high reactivity of TiC and an integrated nitrogen surplus over titanium and carbon amount during annealing.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-17446 (URN)36d8a3a3-3043-435f-a58c-dbc365fa74e9 (Local ID)978-91-7583-033-9 (ISBN)978-91-7583-034-6 (ISBN)36d8a3a3-3043-435f-a58c-dbc365fa74e9 (Archive number)36d8a3a3-3043-435f-a58c-dbc365fa74e9 (OAI)
Note
Godkänd; 2014; 20141016 (andbra); Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Andreas Engström Ämne: Materialteknik/Engineering Materials Uppsats: Reduction Annealing Synthesis of Nanostructured Carbide and Nitride Particulate Composites Examinator: Biträdande professor Marta-Lena Antti, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Diskutant: Biträdande professor Caisa Samuelsson, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Tid: Fredag den 14 november 2014 kl 13:00 Plats: E246, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Engström, A., Mouzon, J., Córdoba, J., Tegman, R. & Antti, M.-L. (2012). Synthesis of a TiCN – SiC polyhedron and elongated crystals nanopowder at low nitrogen concentration (ed.). Paper presented at . Materials letters (General ed.), 81, 148-150
Open this publication in new window or tab >>Synthesis of a TiCN – SiC polyhedron and elongated crystals nanopowder at low nitrogen concentration
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2012 (English)In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 81, p. 148-150Article in journal (Refereed) Published
Abstract [en]

At room temperature diluted TiCl4 and CCl4 were reduced by sodium particles and mixed with a polycarbomethylsilane (PCS) solution to yield a precursor. It was dried and subsequently annealed at 1300 °C, 1400 °C and 1450 °C in a tube furnace using argon with 10 ppm N2. After the 1450 °C annealing a nanocrystalline powder of TiC0.5 N0.5–SiC polyhedron and elongated crystals was obtained. At the low nitrogen concentration during annealing a gradual nitration is proposed. It is promoted by carbon gaseous species, precursor oxidation, a sufficient temperature and a summarised nitrogen surplus compared to the titanium and carbon amount.

National Category
Chemical Process Engineering Other Materials Engineering
Research subject
Chemical Technology; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-12451 (URN)10.1016/j.matlet.2012.04.071 (DOI)000307483300042 ()2-s2.0-84862175981 (Scopus ID)b9adac5a-9bdd-45e9-8b63-8dfea17b4868 (Local ID)b9adac5a-9bdd-45e9-8b63-8dfea17b4868 (Archive number)b9adac5a-9bdd-45e9-8b63-8dfea17b4868 (OAI)
Note
Validerad; 2012; 20120424 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Engström, A. (2006). Max Phase Materials (ed.). In: (Ed.), : . Paper presented at General Assembly of the European Geosciences Union : 02/04/2006 - 07/04/2006.
Open this publication in new window or tab >>Max Phase Materials
2006 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-28300 (URN)20dbde90-435e-11dd-bfd7-000ea68e967b (Local ID)20dbde90-435e-11dd-bfd7-000ea68e967b (Archive number)20dbde90-435e-11dd-bfd7-000ea68e967b (OAI)
Conference
General Assembly of the European Geosciences Union : 02/04/2006 - 07/04/2006
Note

Godkänd; 2006; Bibliografisk uppgift: Titel på proceedings: 2006 European Geosciences Union General Assembly (EGU 2006), Austria Center Vienna, Vienna (Austria), 2-7 Apr 2006; 20080626 (andbra)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-09Bibliographically approved
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