Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics
<p>Technologically modified spinel ceramics are prepared from Al<sub>2</sub>O<sub>3</sub> and 4MgCO<sub>3</sub>×Mg(OH)<sub>2</sub>×5H<sub>2</sub>O powders at 1200, 1300 and 1400 <sup>o</sup>C. The influence of sintering te...
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| Format: | Article |
| Language: | English |
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Kaunas University of Technology
2015-03-01
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| Series: | Medžiagotyra |
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| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/5189 |
| _version_ | 1818296936507113472 |
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| author | Halyna Klym Ivan Hadzaman Oleh Shpotyuk |
| author_facet | Halyna Klym Ivan Hadzaman Oleh Shpotyuk |
| author_sort | Halyna Klym |
| collection | DOAJ |
| description | <p>Technologically modified spinel ceramics are prepared from Al<sub>2</sub>O<sub>3</sub> and 4MgCO<sub>3</sub>×Mg(OH)<sub>2</sub>×5H<sub>2</sub>O powders at 1200, 1300 and 1400 <sup>o</sup>C. The influence of sintering temperature on porous structure and exploitation properties of obtained humidity-sensitive MgO-Al<sub>2</sub>O<sub>3</sub> ceramics are studied. It is shown that increasing of preparing temperature from 1200 to 1400 <sup>o</sup>C result in transformation of pore size distribution in ceramics from tri- to bi-modal including the open macro- and mesopores with sizes from tem to hundreds nm and nanopores until to a few nm. The studied ceramic elements with electrical resistances ~ 10<sup>-2</sup>-10<sup>2</sup> MОhm are high humidity sensitive in the region of 30-95 % with minimal hysteresis in adsorption-desorption cycles. It is established that increasing of humidity sensitivity in ceramics are related to achievement near to optimum pore size distribution and quantity of pores in the all regions. Prolonged degradation transformation in ceramics at higher temperature and relative humidity result in lose sensitivity up to 40-50 %.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.21.1.5189">http://dx.doi.org/10.5755/j01.ms.21.1.5189</a></p> |
| first_indexed | 2024-12-13T04:11:27Z |
| format | Article |
| id | doaj.art-04eea72a1e9f4fd78f7817ad8f67041e |
| institution | Directory Open Access Journal |
| issn | 1392-1320 2029-7289 |
| language | English |
| last_indexed | 2024-12-13T04:11:27Z |
| publishDate | 2015-03-01 |
| publisher | Kaunas University of Technology |
| record_format | Article |
| series | Medžiagotyra |
| spelling | doaj.art-04eea72a1e9f4fd78f7817ad8f67041e2022-12-22T00:00:01ZengKaunas University of TechnologyMedžiagotyra1392-13202029-72892015-03-01211929510.5755/j01.ms.21.1.51895156Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 CeramicsHalyna Klym0Ivan Hadzaman1Oleh Shpotyuk2Lviv Polytechnic National UniversityDrohobych Ivan Franko State Pedagogical UniversityLviv Institute of Materials of Scientific Research Company “Carat”<p>Technologically modified spinel ceramics are prepared from Al<sub>2</sub>O<sub>3</sub> and 4MgCO<sub>3</sub>×Mg(OH)<sub>2</sub>×5H<sub>2</sub>O powders at 1200, 1300 and 1400 <sup>o</sup>C. The influence of sintering temperature on porous structure and exploitation properties of obtained humidity-sensitive MgO-Al<sub>2</sub>O<sub>3</sub> ceramics are studied. It is shown that increasing of preparing temperature from 1200 to 1400 <sup>o</sup>C result in transformation of pore size distribution in ceramics from tri- to bi-modal including the open macro- and mesopores with sizes from tem to hundreds nm and nanopores until to a few nm. The studied ceramic elements with electrical resistances ~ 10<sup>-2</sup>-10<sup>2</sup> MОhm are high humidity sensitive in the region of 30-95 % with minimal hysteresis in adsorption-desorption cycles. It is established that increasing of humidity sensitivity in ceramics are related to achievement near to optimum pore size distribution and quantity of pores in the all regions. Prolonged degradation transformation in ceramics at higher temperature and relative humidity result in lose sensitivity up to 40-50 %.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.21.1.5189">http://dx.doi.org/10.5755/j01.ms.21.1.5189</a></p>http://matsc.ktu.lt/index.php/MatSc/article/view/5189ceramics, porous structure, electrical properties, humidity sensitivity, capillary condensation |
| spellingShingle | Halyna Klym Ivan Hadzaman Oleh Shpotyuk Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics Medžiagotyra ceramics, porous structure, electrical properties, humidity sensitivity, capillary condensation |
| title | Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics |
| title_full | Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics |
| title_fullStr | Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics |
| title_full_unstemmed | Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics |
| title_short | Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics |
| title_sort | influence of sintering temperature on pore structure and electrical properties of technologically modified mgo al2o3 ceramics |
| topic | ceramics, porous structure, electrical properties, humidity sensitivity, capillary condensation |
| url | http://matsc.ktu.lt/index.php/MatSc/article/view/5189 |
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