Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance
High-quality porous ceramics are extremely attractive in terms of energy conservation and consumption reduction, and thus are one of the research hotspots pursued in recent years. For this purpose, porous MgO-based ceramics with outstanding thermal shock resistance and thermal insulation performance...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424000620 |
| _version_ | 1797338289167925248 |
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| author | Xinming Ren Zhihui Wang Wei Ji Shengying Hou Shuli Sun Gaofeng Fu Chengji Deng Beiyue Ma |
| author_facet | Xinming Ren Zhihui Wang Wei Ji Shengying Hou Shuli Sun Gaofeng Fu Chengji Deng Beiyue Ma |
| author_sort | Xinming Ren |
| collection | DOAJ |
| description | High-quality porous ceramics are extremely attractive in terms of energy conservation and consumption reduction, and thus are one of the research hotspots pursued in recent years. For this purpose, porous MgO-based ceramics with outstanding thermal shock resistance and thermal insulation performance were designed and prepared by using the direct firing method and introducing alumina with different paticle sizes as additives. The results reveal that the in-situ formed MgAl2O4 phase by alumina additives simultaneously improves the apparent porosity, thermal insulation, and thermal shock resistance of the prepared MgO-based ceramics. Specifically, the increase in the apparent porosity can be attributed to the volume expansion effect of MgAl2O4 phase, so the industrial alumina with larger particle size is more effective (20 wt% addition: the apparent porosity from 43.5 % to 55.4 %, the thermal conductivity from 0.977 to 0.389 W m−1 K−1 at 800 °C); moreover, the enhancement in thermal shock resistance can be ascribed to the residual stress effect caused by the MgAl2O4 particles, so the micron alumina with smaller particle size is more efficient (10 wt% addition: the residual strength ratio from 93.48 % to 65.13 %–113.92 % and 94.47 % after one and five air-quenching). Therefore, this work demonstrates a novel synthetic strategy for porous ceramics with great potential in the field of high-temperature thermal insulation. |
| first_indexed | 2024-03-08T09:27:51Z |
| format | Article |
| id | doaj.art-690d76f5174c4237a201a0ed44057f11 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-08T09:27:51Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-690d76f5174c4237a201a0ed44057f112024-01-31T05:44:42ZengElsevierJournal of Materials Research and Technology2238-78542024-01-012843704381Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performanceXinming Ren0Zhihui Wang1Wei Ji2Shengying Hou3Shuli Sun4Gaofeng Fu5Chengji Deng6Beiyue Ma7Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, PR China; Inner Mongolia Metal Material Research Institute, Yantai, 264003, PR ChinaInner Mongolia Metal Material Research Institute, Yantai, 264003, PR ChinaInner Mongolia Metal Material Research Institute, Yantai, 264003, PR ChinaInner Mongolia Metal Material Research Institute, Yantai, 264003, PR ChinaInner Mongolia Metal Material Research Institute, Yantai, 264003, PR ChinaKey Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, PR ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, PR ChinaKey Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, PR China; Corresponding author.High-quality porous ceramics are extremely attractive in terms of energy conservation and consumption reduction, and thus are one of the research hotspots pursued in recent years. For this purpose, porous MgO-based ceramics with outstanding thermal shock resistance and thermal insulation performance were designed and prepared by using the direct firing method and introducing alumina with different paticle sizes as additives. The results reveal that the in-situ formed MgAl2O4 phase by alumina additives simultaneously improves the apparent porosity, thermal insulation, and thermal shock resistance of the prepared MgO-based ceramics. Specifically, the increase in the apparent porosity can be attributed to the volume expansion effect of MgAl2O4 phase, so the industrial alumina with larger particle size is more effective (20 wt% addition: the apparent porosity from 43.5 % to 55.4 %, the thermal conductivity from 0.977 to 0.389 W m−1 K−1 at 800 °C); moreover, the enhancement in thermal shock resistance can be ascribed to the residual stress effect caused by the MgAl2O4 particles, so the micron alumina with smaller particle size is more efficient (10 wt% addition: the residual strength ratio from 93.48 % to 65.13 %–113.92 % and 94.47 % after one and five air-quenching). Therefore, this work demonstrates a novel synthetic strategy for porous ceramics with great potential in the field of high-temperature thermal insulation.http://www.sciencedirect.com/science/article/pii/S2238785424000620Magnesite tailingsMagnesiaAluminaThermal shock resistanceVolume expansion effect |
| spellingShingle | Xinming Ren Zhihui Wang Wei Ji Shengying Hou Shuli Sun Gaofeng Fu Chengji Deng Beiyue Ma Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance Journal of Materials Research and Technology Magnesite tailings Magnesia Alumina Thermal shock resistance Volume expansion effect |
| title | Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance |
| title_full | Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance |
| title_fullStr | Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance |
| title_full_unstemmed | Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance |
| title_short | Porous MgO-based ceramics synthesized by the volume expansion effect: Designing and performance |
| title_sort | porous mgo based ceramics synthesized by the volume expansion effect designing and performance |
| topic | Magnesite tailings Magnesia Alumina Thermal shock resistance Volume expansion effect |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424000620 |
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