Acicular porous mullite from diatom frustules

Acicular porous mullite from diatom frustules
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来自硅藻壳的针状多孔莫来石

DOI:
10.1016/j.matlet.2016.02.023
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发表时间:
2016-05
期刊:
影响因子:
3
通讯作者:
Luo Lijie
Luo Lijie
中科院分区:
材料科学3区
文献类型:
--
作者:
Dong Lei;Zhang Chao;Chen Yongjun;Cao Lihua;Li Jianbao;Luo Lijie

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本文首次报道了以硅藻的多孔硅壳硅藻壳为硅源,合成具有纤维状孔结构的多孔莫来石陶瓷。在不使用任何致孔剂和粘结剂的情况下,通过模压法制备的多孔莫来石陶瓷显示出高的开孔率(高达60%),这是由于硅藻硅藻壳的高度多孔性和莫来石晶须的接近零的烧结收缩。硅藻硅藻壳中的圆形气孔转变为莫来石陶瓷中的纤维状气孔。在1600 °C烧结3h,孔隙率为55.5%时,多孔陶瓷的抗弯强度为38.6MPa。
We report for the first time using diatom frustules, the porous silica shells of diatoms, as Si precursor for synthesis of porous mullite ceramics with fibrous pore morphology. The porous mullite ceramics prepared by mould pressing method without using any porogen and binder showed high open porosity (up to 60%) due to the highly porous nature of diatom frustules and near zero sintering shrinkage of mullite whiskers. The original circular pores of diatom frustules were turned into fibrous pores of mullite ceramics. The porous ceramics showed flexural strength of 38.6 MPa at the porosity of 55.5% when sintered at 1600 °C for 3 h.
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