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In-situ graphene platelets formation and its suppression during reactive spark plasma sintering of boron carbide/titanium diboride composites
- 1.0544807 - ÚFM 2022 RIV GB eng J - Journal Article
Unsal, H. - Grasso, S. - Kovalčíková, A. - Hanzel, O. - Tatarková, M. - Dlouhý, Ivo - Tatarko, P.
In-situ graphene platelets formation and its suppression during reactive spark plasma sintering of boron carbide/titanium diboride composites.
Journal of the European Ceramic Society. Roč. 41, č. 13 (2021), s. 6281-6289. ISSN 0955-2219. E-ISSN 1873-619X
Grant - others:AV ČR(CZ) SAV-18-12; AV ČR(CZ) SAV-21-04
Program: Bilaterální spolupráce; Bilaterální spolupráce
Institutional support: RVO:68081723
Keywords : mechanical-properties * titanium diboride * b4c ceramics * flash * carbide * microstructure * toughness * carbon * Boron carbide * Titanium diboride * Graphene platelets * Spark plasma sintering * Reactive sintering
OECD category: Ceramics
Impact factor: 6.364, year: 2021
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0955221921004659?via%3Dihub
Boron carbide composites with 10 vol.% TiB2 were prepared by reactive sintering of B4C, TiO2, and carbon black powder mixture at the temperature of 1800 degrees C, under a pressure of 70 MPa in a vacuum. The combined effects of electric current and in-situ reactions led to a significant overheating of the central part of the sample, while no overheating was observed for hot press and non-reactive SPS processes. A lower electrical resistivity of TiB2 produced a significant Joule heating of boron carbide, leading to its partial decomposition to form gaseous boron and graphene platelets. Homogenous, fully dense and graphene-free samples were obtained when employing an insulating Al2O3 paper during reactive SPS. A short dwell time (30 s after a degassing step of 6 min) and the uniform distribution of fine TiB2 grains were the main advantages of isolated SPS over the reactive hot press and SPS processes, respectively.
Permanent Link: http://hdl.handle.net/11104/0321792
Number of the records: 1