Mullite porous ceramics with high strength for high-temperature thermal insulation
To address the low thermal efficiency and serious energy consumption of industrial kilns, the gel casting method is used herein for the successful preparation of porous mullite thermal insulation materials with good thermal and mechanical properties. The effects of poly-γ-glutamic acid (γ-PGA) conte...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423027370 |
| _version_ | 1797301529144721408 |
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| author | Yameng Wan Xiang Li Junying Ma |
| author_facet | Yameng Wan Xiang Li Junying Ma |
| author_sort | Yameng Wan |
| collection | DOAJ |
| description | To address the low thermal efficiency and serious energy consumption of industrial kilns, the gel casting method is used herein for the successful preparation of porous mullite thermal insulation materials with good thermal and mechanical properties. The effects of poly-γ-glutamic acid (γ-PGA) content (0.6–2.2 wt%) on the performances of the slurries, green bodies, and sintered bodies are comprehensively investigated based on the gelation mechanism. The mullite slurries show good flowability and stability, and the powders are evenly dispersed. Furthermore, the green bodies have sufficiently high mechanical strengths to meet the conditions of processing into complex shapes. The sample open porosity is shown to increase, and the pore size gradually becomes more uniform, as the γ-PGA content is increased. At a γ-PGA content of 1.8 wt%, the open porosity reaches 75.85 %, the compressive strength is 14.02 MP. The thermal conductivity increases from 0.263 W/(m⋅K) to 0.544 W/(m⋅K) as the temperature increases from 25 °C to 1000 °C. At the same time, the Gong model accurately describes the relationship between the thermal conductivity and porosity. In addition, infrared thermographic analysis and alcohol lamp ablation experiments macroscopically demonstrate the excellent thermal insulation performance of the porous mullite at high temperatures. |
| first_indexed | 2024-03-07T23:22:55Z |
| format | Article |
| id | doaj.art-7ad1a356115e4c6e89541ffb292477d9 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:22:55Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-7ad1a356115e4c6e89541ffb292477d92024-02-21T05:27:14ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012756925700Mullite porous ceramics with high strength for high-temperature thermal insulationYameng Wan0Xiang Li1Junying Ma2School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Luoyang, 471023, China; Corresponding author.School of Material Science and Engineering, Zhengzhou University, NO.100 Science Avenue, Zhengzhou, 450001, ChinaSchool of Chemistry and Chemical Engineering, Henan University of Science and Technology, Luoyang, 471023, China; Corresponding author.To address the low thermal efficiency and serious energy consumption of industrial kilns, the gel casting method is used herein for the successful preparation of porous mullite thermal insulation materials with good thermal and mechanical properties. The effects of poly-γ-glutamic acid (γ-PGA) content (0.6–2.2 wt%) on the performances of the slurries, green bodies, and sintered bodies are comprehensively investigated based on the gelation mechanism. The mullite slurries show good flowability and stability, and the powders are evenly dispersed. Furthermore, the green bodies have sufficiently high mechanical strengths to meet the conditions of processing into complex shapes. The sample open porosity is shown to increase, and the pore size gradually becomes more uniform, as the γ-PGA content is increased. At a γ-PGA content of 1.8 wt%, the open porosity reaches 75.85 %, the compressive strength is 14.02 MP. The thermal conductivity increases from 0.263 W/(m⋅K) to 0.544 W/(m⋅K) as the temperature increases from 25 °C to 1000 °C. At the same time, the Gong model accurately describes the relationship between the thermal conductivity and porosity. In addition, infrared thermographic analysis and alcohol lamp ablation experiments macroscopically demonstrate the excellent thermal insulation performance of the porous mullite at high temperatures.http://www.sciencedirect.com/science/article/pii/S2238785423027370MulliteRheological propertiesGreen body propertiesHigh open porosityThermal insulation |
| spellingShingle | Yameng Wan Xiang Li Junying Ma Mullite porous ceramics with high strength for high-temperature thermal insulation Journal of Materials Research and Technology Mullite Rheological properties Green body properties High open porosity Thermal insulation |
| title | Mullite porous ceramics with high strength for high-temperature thermal insulation |
| title_full | Mullite porous ceramics with high strength for high-temperature thermal insulation |
| title_fullStr | Mullite porous ceramics with high strength for high-temperature thermal insulation |
| title_full_unstemmed | Mullite porous ceramics with high strength for high-temperature thermal insulation |
| title_short | Mullite porous ceramics with high strength for high-temperature thermal insulation |
| title_sort | mullite porous ceramics with high strength for high temperature thermal insulation |
| topic | Mullite Rheological properties Green body properties High open porosity Thermal insulation |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423027370 |
| work_keys_str_mv | AT yamengwan mulliteporousceramicswithhighstrengthforhightemperaturethermalinsulation AT xiangli mulliteporousceramicswithhighstrengthforhightemperaturethermalinsulation AT junyingma mulliteporousceramicswithhighstrengthforhightemperaturethermalinsulation |