Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures
This paper is devoted to the sintering process of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> ceramics. The studied method was electroconsolidation with directly applied electric current. This method provides substantial improvements to...
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2022-09-01
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| author | Zbigniew Krzysiak Edwin Gevorkyan Volodymyr Nerubatskyi Mirosław Rucki Volodymyr Chyshkala Jacek Caban Tomasz Mazur |
| author_facet | Zbigniew Krzysiak Edwin Gevorkyan Volodymyr Nerubatskyi Mirosław Rucki Volodymyr Chyshkala Jacek Caban Tomasz Mazur |
| author_sort | Zbigniew Krzysiak |
| collection | DOAJ |
| description | This paper is devoted to the sintering process of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> ceramics. The studied method was electroconsolidation with directly applied electric current. This method provides substantial improvements to the mechanical properties of the sintered samples compared to the traditional sintering in the air. The research covered elemental and phase analysis of the samples, which revealed phase transition of high-alumina solid solutions into mullite and corundum. Zirconia was represented mainly by tetragonal phase, but monoclinic phase was present, too. Electroconsolidation enabled samples to reach a density of 3.0 g/cm<sup>3</sup> at 1300 °C, while the sample prepared by traditional sintering method obtained it only at 1700 °C. For the composite Al<sub>2</sub>O<sub>3</sub>—20 wt.% SiO<sub>2</sub>—10 wt.% ZrO<sub>2</sub> fabricated by electroconsolidation, it was demonstrated that fracture toughness was higher by 20–30%, and hardness was higher by 15–20% compared to that of samples sintered traditionally. Similarly, the samples fabricated by electroconsolidation exhibited elastic modulus <i>E</i> higher by 15–20%. The hypothesis was proposed that the difference in mechanical and physical properties could be attributed to the peculiarities of phase formation processes during electroconsolidation. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:34:23Z |
| publishDate | 2022-09-01 |
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| spelling | doaj.art-3e67f47cdd574fb59169416e16da76822023-11-23T13:35:05ZengMDPI AGMaterials1996-19442022-09-011517607310.3390/ma15176073Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders MixturesZbigniew Krzysiak0Edwin Gevorkyan1Volodymyr Nerubatskyi2Mirosław Rucki3Volodymyr Chyshkala4Jacek Caban5Tomasz Mazur6Faculty of Production Engineering, University of Life Sciences in Lublin, Głęboka 28, 20-612 Lublin, PolandWagon Engineering and Production Quality, Ukraine State University of Railway Transport, 7 Feuerbach Sq., 61010 Kharkiv, UkraineWagon Engineering and Production Quality, Ukraine State University of Railway Transport, 7 Feuerbach Sq., 61010 Kharkiv, UkraineInstitute of Mechanical Science, Vilnius Gediminas Technical University, J. Basanaviciaus str. 28, LT-03224 Vilnius, LithuaniaDepartment of Reactor Engineering Materials and Physical Technologies, V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, UkraineFaculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, PolandFaculty of Mechanical Engineering, Kazimierz Pulaski University of Technology and Humanities in Radom, Stasieckiego 54, 26-600 Radom, PolandThis paper is devoted to the sintering process of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> ceramics. The studied method was electroconsolidation with directly applied electric current. This method provides substantial improvements to the mechanical properties of the sintered samples compared to the traditional sintering in the air. The research covered elemental and phase analysis of the samples, which revealed phase transition of high-alumina solid solutions into mullite and corundum. Zirconia was represented mainly by tetragonal phase, but monoclinic phase was present, too. Electroconsolidation enabled samples to reach a density of 3.0 g/cm<sup>3</sup> at 1300 °C, while the sample prepared by traditional sintering method obtained it only at 1700 °C. For the composite Al<sub>2</sub>O<sub>3</sub>—20 wt.% SiO<sub>2</sub>—10 wt.% ZrO<sub>2</sub> fabricated by electroconsolidation, it was demonstrated that fracture toughness was higher by 20–30%, and hardness was higher by 15–20% compared to that of samples sintered traditionally. Similarly, the samples fabricated by electroconsolidation exhibited elastic modulus <i>E</i> higher by 15–20%. The hypothesis was proposed that the difference in mechanical and physical properties could be attributed to the peculiarities of phase formation processes during electroconsolidation.https://www.mdpi.com/1996-1944/15/17/6073ceramic compositeAl<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub>electroconsolidationmullitecorundumglassy phase |
| spellingShingle | Zbigniew Krzysiak Edwin Gevorkyan Volodymyr Nerubatskyi Mirosław Rucki Volodymyr Chyshkala Jacek Caban Tomasz Mazur Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures Materials ceramic composite Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> electroconsolidation mullite corundum glassy phase |
| title | Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures |
| title_full | Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures |
| title_fullStr | Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures |
| title_full_unstemmed | Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures |
| title_short | Peculiarities of the Phase Formation during Electroconsolidation of Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> Powders Mixtures |
| title_sort | peculiarities of the phase formation during electroconsolidation of al sub 2 sub o sub 3 sub sio sub 2 sub zro sub 2 sub powders mixtures |
| topic | ceramic composite Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–ZrO<sub>2</sub> electroconsolidation mullite corundum glassy phase |
| url | https://www.mdpi.com/1996-1944/15/17/6073 |
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