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Nb(Si,C,N) composite materials densified by spark plasma sintering
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 4
2015 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 35, no 12, 3319-3327 p.Article in journal (Refereed) Published
Abstract [en]

Nb2N/Nb5Si3/Nb ceramic metal and Nb(C,N)/Nb5Si(3+x)Cx, ceramic like composites were densified by spark plasma sintering (SPS). The precursor multiphase powders were synthesized by solid-state reactions of a polysilazane precursor with niobium powder addition. By varying the amount of reactive species of both precursor and niobium the phase composition and structure of the synthesized multiphase powders can be tailored from metal dominated to mainly ceramic like. The results demonstrated that the SPS approach leads to highly dense samples at 1600 degrees C with an applied uniaxial pressure of 100 MPa. Furthermore, XRD measurements and EBSD analysis proofed that SPS is a feasible method to retain the original phase compositions and grain sizes within the multiphase powders during sintering. The evaluation of the Vickers indents revealed both a dependency of the measured values on phase composition and on residual porosity.

Place, publisher, year, edition, pages
2015. Vol. 35, no 12, 3319-3327 p.
Keyword [en]
Polymer derived ceramics, Spark-plasma sintering, Composite material, Reactive pyrolysis, Refractory metal
National Category
Materials Engineering Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-119280DOI: 10.1016/j.jeurceramsoc.2015.02.005ISI: 000357356000016OAI: oai:DiVA.org:su-119280DiVA: diva2:844373
Available from: 2015-08-05 Created: 2015-08-03 Last updated: 2017-12-04Bibliographically approved

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