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Iron precipitation in basalt fibres embedded in partially pyrolysed methylsiloxane matrix
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SYSNO ASEP 0504971 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Iron precipitation in basalt fibres embedded in partially pyrolysed methylsiloxane matrix Author(s) Halasová, Martina (UFM-A)
Kuběna, Ivo (UFM-A) RID, ORCID
Roupcová, Pavla (UFM-A) RID, ORCID
Černý, Martin (USMH-B) RID, ORCID, SAI
Strachota, Adam (UMCH-V) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCIDNumber of authors 6 Source Title Composites Part A-Applied Science and Manufacturing. - : Elsevier - ISSN 1359-835X
Roč. 123, AUG (2019), s. 286-292Number of pages 7 s. Language eng - English Country GB - United Kingdom Keywords Pyrolysis ; BCC iron ; Precipitation ; Basalt fibres ; Composite ; Crystallisation ; TEM ; SEM ; Mössbauer spectroscopy Subject RIV JI - Composite Materials OECD category Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics Subject RIV - cooperation Institute of Rock Structure and Mechanics - Composite Materials
Institute of Macromolecular Chemistry - Macromolecular ChemistryR&D Projects GA17-12546S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFM-A - RVO:68081723 ; USMH-B - RVO:67985891 ; UMCH-V - RVO:61389013 UT WOS 000472124900030 EID SCOPUS 85066084841 DOI 10.1016/j.compositesa.2019.05.026 Annotation Composites investigated in this article owned the highest fracture resistance after pyrolysis at 650 °C. Above
700 °C the mechanical properties of the composites deteriorated as the matrix transformation and fibre crystallisation
progressed. In this work, it was found that the crystallisation processes in fibres were affected by
diffusion of pyrolysis gases through the fibre–matrix interface. Additional annealing in oxidative atmosphere
distinctly changed the crystallisation processes, resulting in a slightly improved fracture toughness of the
composites. Microstructural changes in the composite were investigated using SEM, TEM, and Mössbauer
spectroscopy. Crystals of elemental iron (Fe0) were found in the fibres. Their formation can be explained by the
reduction of ferrous (Fe2+) ions initially present in the fibres by pyrolysis gases (hydrogen, methane) released
from the pyrolysing matrix. The BCC lattice of the Fe0 particles was clearly assigned by comparison of measured
diffraction patterns with reference data as well as by the Mössbauer spectroscopyWorkplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2020 Electronic address https://www.sciencedirect.com/science/article/pii/S1359835X19302015?via%3Dihub
Number of the records: 1