Effect of activating additives on the cold sintering process of (MnFeCoNiCu)3O4 high-entropy ceramics
| Autor: | A. V. Smirnov, Yu. D. Ivakin, M. V. Kornyushin, A. A. Kholodkova, A. A. Vasin, S. Ayudinyan, H. V. Kirakosyan |
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| Jazyk: | ruština |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Тонкие химические технологии, Vol 17, Iss 5, Pp 439-449 (2022) |
| Druh dokumentu: | article |
| ISSN: | 2410-6593 2686-7575 |
| DOI: | 10.32362/2410-6593-2022-17-5-439-449 |
| Popis: | Objectives. To obtain experimental data on the effect of activating additive type on the cold sintering process of (MnFeCoNiCu)3O4 high-entropy ceramic. The following substances were used as activating additives: ammonium acetate (CH3COONH4), acetic acid (CH3COOH), ammonium chloride (NH4Cl), potassium fluoride dihydrate (КF·2H2O), lithium fluoride (LiF), sodium fluoride (NaF), and sodium hydroxide (NaOH).Methods. Synthesis of the initial powder by low-temperature self-propagating method; investigation of the powder particles size distribution by laser diffraction method; analysis of the particle shape and compacted sample microstructure by scanning electron microscopy; investigation of the phase composition by X-ray phase analysis; high-entropy ceramic sample consolidation by cold sintering process. The density of the initial powder and the relative density of cold sintered samples were determined by the Archimedes method.Results. Samples with a relative density of over 0.70 were obtained using distilled water, CH3COONH4 and NaOH during cold sintering at 300 °C, with a holding time of 30 min and pressure 315 MPa.Conclusions. For the first time, the effect of the type of activating additive on the relative density of high-entropy ceramics (MnFeCoNiCu)3O4 samples obtained by cold sintering process has been experimentally demonstrated. The samples microstructures have pronounced differences: 20 wt % distilled water does not lead to grain growth, with only their compaction to 0.71 relative density observed; however, the addition of 0.1 wt % CH3COONH4 and NaOH increases the average grain size when reaching similar relative densities (0.70 and 0.71, respectively). X-ray diffraction analysis showed that the cold sintering process does not lead to a change in the phase composition of the initial (MnFeCoNiCu)3O4 powder, confirming the preservation of the high-entropy structure. |
| Databáze: | Directory of Open Access Journals |
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