Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 1, Pages 1464-1467Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.09.095
Keywords
Ceramic foams; Light weigh; Alumina; Zirconia; Compressive strength
Categories
Funding
- National Natural Science Foundation of China [51572140, 51702184]
- China Postdoctoral Science Foundation [2018M630154, 2017T100550, 2018M630149, 2017M610085]
- Basic Research Program of Shenzhen [JCYJ20170306155944271]
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The mechanical strength of highly porous ceramic foams shows significant attenuation with the increase of porosity, especially for ceramic foams with very high porosity level above 95%. Ultra-light bulk composite ceramic foams were fabricated via introducing 20 wt% zirconia in alumina-based cell wall, aiming at improving mechanical strength of alumina based ceramic foams. The preparation and stability of alumina and zirconia particles synergistically stabilized foams were investigated. The obtained bulk ceramic foams manifested an exciting combination of both high porosity above 96% and excellent specific compressive strength, due to their closed pore structure, defect-free cell wall with uniform thickness, and uniformly distributed zirconia grains in alumina matrix. The alumina/zirconia composite ceramic foams with porosity of 96.7% exhibited compressive strength of 1.11 +/- 0.07 MPa, which was much higher than that of alumina ceramic foams in the case of same porosity.
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