FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS
ZrSiO₄ modified mullite-based porous ceramics were fabricated at 1400 °C by using a foam-gelcasting method from industrial grade powder materials. Except for mullite and ZrSiO₄ no other phases were identified in the fired samples added with ZrSiO₄, implying that at the firing temperature, ZrSiO₄ nei...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2020-08-01
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| Series: | Ceramics-Silikáty |
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| Online Access: |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1333
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| _version_ | 1818623174608158720 |
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| author | Xueyin Liu Shengtao Ge Zhang Haijun Bi Yubao Jia Quanli Zhang Shaowei |
| author_facet | Xueyin Liu Shengtao Ge Zhang Haijun Bi Yubao Jia Quanli Zhang Shaowei |
| author_sort | Xueyin Liu |
| collection | DOAJ |
| description | ZrSiO₄ modified mullite-based porous ceramics were fabricated at 1400 °C by using a foam-gelcasting method from industrial grade powder materials. Except for mullite and ZrSiO₄ no other phases were identified in the fired samples added with ZrSiO₄, implying that at the firing temperature, ZrSiO₄ neither decomposed, nor reacted with mullite. In the microstructures of these samples, mullite/ZrSiO₄ grains were evenly distributed, and the overall pore sizes were reduced. The addition of ZrSiO₄ showed little effect on porosity and bulk density of fired samples, which were respectively around 77% and 0.7g.cm-3. However, it led to the enhanced mechanical strength, and more importantly, the reduced thermal conductivity, especially at high temperatures. When 8 wt% ZrSiO₄ was added, flexural and compressive strengths increased respectively to 3.63 and 7.35 MPa, whereas thermal conductivity at 200 and 1000 °C was reduced to 0.160 and 0.277 W.m-1.K-1, respectively, which was mainly attributed to the shading effect, decreased size of "large" spherical pores, and more centralized and homogenized pore size distribution. |
| first_indexed | 2024-12-16T18:36:52Z |
| format | Article |
| id | doaj.art-c4d8301b674d444dbc3c3373aa9c77df |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-12-16T18:36:52Z |
| publishDate | 2020-08-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-c4d8301b674d444dbc3c3373aa9c77df2022-12-21T22:21:09ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472020-08-0164336537010.13168/cs.2020.002410.13168/cs.2020.0024.20200817081458FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICSXueyin Liu0Shengtao GeZhang HaijunBi YubaoJia QuanliZhang Shaowei College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, China ZrSiO₄ modified mullite-based porous ceramics were fabricated at 1400 °C by using a foam-gelcasting method from industrial grade powder materials. Except for mullite and ZrSiO₄ no other phases were identified in the fired samples added with ZrSiO₄, implying that at the firing temperature, ZrSiO₄ neither decomposed, nor reacted with mullite. In the microstructures of these samples, mullite/ZrSiO₄ grains were evenly distributed, and the overall pore sizes were reduced. The addition of ZrSiO₄ showed little effect on porosity and bulk density of fired samples, which were respectively around 77% and 0.7g.cm-3. However, it led to the enhanced mechanical strength, and more importantly, the reduced thermal conductivity, especially at high temperatures. When 8 wt% ZrSiO₄ was added, flexural and compressive strengths increased respectively to 3.63 and 7.35 MPa, whereas thermal conductivity at 200 and 1000 °C was reduced to 0.160 and 0.277 W.m-1.K-1, respectively, which was mainly attributed to the shading effect, decreased size of "large" spherical pores, and more centralized and homogenized pore size distribution. http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1333 microstructure pore size distribution thermal conductivity mechanical property |
| spellingShingle | Xueyin Liu Shengtao Ge Zhang Haijun Bi Yubao Jia Quanli Zhang Shaowei FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS Ceramics-Silikáty microstructure pore size distribution thermal conductivity mechanical property |
| title | FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS |
| title_full | FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS |
| title_fullStr | FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS |
| title_full_unstemmed | FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS |
| title_short | FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS |
| title_sort | foam gelcasting preparation of zr si o₄ modified porous mullite ceramics |
| topic | microstructure pore size distribution thermal conductivity mechanical property |
| url |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1333
|
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