A simple and efficient way to prepare porous mullite matrix ceramics via directly sintering SiO2-Al2O3 microspheres
A simple and efficient way to prepare porous mullite matrix ceramics via directly sintering SiO2-Al2O3 microspheres
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DOI：
10.1016/j.jeurceramsoc.2016.03.037
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发表时间：
2016-09
影响因子：
5.7
通讯作者：
Na Li;Xiaoyan Zhang;Yanan Qu;Jie Xu;N. Ma;Ke Gan;W. Huo;Jinlong Yang
中科院分区：
文献类型：
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作者：
Na Li;Xiaoyan Zhang;Yanan Qu;Jie Xu;N. Ma;Ke Gan;W. Huo;Jinlong Yang
提出了一种在空气中直接烧结SiO2-Al 2 O3微球（SAMs）制备多孔莫来石基陶瓷的新方法，与其他方法相比，该方法简单、高效。研究了烧结温度对多孔陶瓷的物相组成、显微结构、气孔率和抗压强度的影响。结果表明，当烧结温度高于1450 °C时，有莫来石相生成。SEM结果表明，烧结温度对气孔形貌的形成有显著影响。随着烧结温度从1200 °C升高到1650 °C，自组装膜内部和之间原有的小孔发展为大孔，其孔径最大增加到自组装膜的8倍以上，且孔的分布相对均匀。在1550 °C烧结时，获得了气孔率为81.37%，抗压强度为6.25 ± 0.91MPa的莫来石基多孔陶瓷。
A novel route was proposed to fabricate porous mullite matrix ceramics by directly sintering SiO2-Al2O3microspheres (SAMs) in air, which was simple and efficient compared with other methods. The effects of sintering temperature on the phase composition, microstructure, porosity and compressive strength of porous ceramics were studied. It is found that the mullite phase generates when sintered at above 1450 °C. SEM results shows that the sintering temperature has a significant influence on the formation of pores morphology. As the sintering temperature increases from 1200 °C to 1650 °C, the original small holes inside and between the SAMs develop into macropores, whose pore size increases to eight times more than that of SAMs at a maximum, and the distribution of pores is relatively uniform. Porous mullite matrix ceramics with the porosity of 81.37% and compressive strength of 6.25 ± 0.91 MPa have been obtained through this method at the sintering temperature of 1550 °C.