期刊
CERAMICS INTERNATIONAL
卷 47, 期 8, 页码 11193-11201出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.12.244
关键词
Foam-freeze casting; Seed; Mullite whisker; Anorthite; Porous ceramics
资金
- National Natural Science Foundation of China, China [51472023]
- Beijing Natural Science Foundation, China [2182059]
Porous anorthite/mullite whisker ceramics with high strength and low thermal conductivity were successfully prepared through a combination of seed-assisted in situ synthesis and foam-freeze casting techniques. The materials exhibited a high apparent porosity, low bulk density, high compressive strength, and low thermal conductivity, making them suitable for thermal insulating applications.
Porous anorthite/mullite whisker ceramics with both high strength and low thermal conductivity have been successfully prepared by combining seed-assisted in situ synthesis and foam-freeze casting techniques. The addition of mullite seed was conducive to a reduction in the sintering shrinkage, pore size, and anorthite grain size. This increased the high aspect ratio of mullite whiskers, which enhanced the strength and diminished the thermal conductivity. Mullite whiskers overlapped to form a stable three-dimensional network structure similar to the bird-s nest, which was also beneficial to heighten the mechanical properties of the prepared porous ceramics. Through this method, the prepared materials had a high apparent porosity of 87.7-90.2%, a low bulk density of 0.29-0.36 g/cm(3), a high compressive strength of 0.65-3.31 MPa, and low thermal conductivity of 0.067-0.112 W/m.K. The results indicated that the method described here can fabricate porous ceramics with excellent properties for further thermal insulating applications.
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