|
This article is cited in 1 scientific paper (total in 1 paper)
Mechanical properties, strength physics and plasticity
Microstructure, elastic, and inelastic properties of biomorphic carbons carbonized using a Fe-containing catalyst
T. S. Orlovaab, B. K. Kardasheva, B. I. Smirnova, A. Gutierrez-Pardoc, J. Ramirez-Ricoc a Ioffe Institute, St. Petersburg
b St. Petersburg National Research University of Information Technologies, Mechanics and Optics
c Dpto Fisica de la Materia Condensada-ICMS, Universidad de Sevilla,
Sevilla, Spain
Abstract:
The microstructure and amplitude dependences of the Young’s modulus $E$ and internal friction (logarithmic decrement $\delta$), and microplastic properties of biocarbon matrices BE-C(Fe) obtained by beech tree carbonization at temperatures $T_{\operatorname{carb}}$ = 850–1600$^\circ$C in the presence of an iron-containing catalyst are studied. By X-ray diffraction analysis and transmission electron microscopy, it is shown that the use of Fe-catalyst during carbonization with $T_{\operatorname{carb}}\ge$ 1000$^\circ$C leads to the appearance of a bulk graphite phase in the form of nanoscale bulk graphite inclusions in a quasi-amorphous matrix, whose volume fraction and size increase with $T_{\operatorname{carb}}$. The correlation of the obtained dependences $E(T_{\operatorname{carb}})$ and $\delta(T_{\operatorname{carb}})$ with microstructure evolution with increasing $T_{\operatorname{carb}}$ is revealed. It is found that $E$ is mainly defined by a crystalline phase fraction in the amorphous matrix, i.e., a nanocrystalline phase at $T_{\operatorname{carb}}<$ 1150$^\circ$C and a bulk graphite phase at $T_{\operatorname{carb}}>$ 1300$^\circ$C. Maximum values $E$ = 10–12 GPa are achieved for samples with $T_{\operatorname{carb}}\approx$ 1150 and 1600$^\circ$C. It is shown that the microplasticity manifest itself only in biocarbons with $T_{\operatorname{carb}}\ge$ 1300$^\circ$ C (upon reaching a significant volume of the graphite phase); in this case, the conditional microyield stress decreases with increasing total volume of introduced mesoporosity (free surface area).
Received: 28.04.2016
Citation:
T. S. Orlova, B. K. Kardashev, B. I. Smirnov, A. Gutierrez-Pardo, J. Ramirez-Rico, “Microstructure, elastic, and inelastic properties of biomorphic carbons carbonized using a Fe-containing catalyst”, Fizika Tverdogo Tela, 58:12 (2016), 2393–2399; Phys. Solid State, 58:12 (2016), 2481–2487
Linking options:
https://www.mathnet.ru/eng/ftt9748 https://www.mathnet.ru/eng/ftt/v58/i12/p2393
|
Statistics & downloads: |
Abstract page: | 26 | Full-text PDF : | 5 |
|