Abstract
Alumina foam ceramics reinforced with alumina fibers were prepared with gel-casting. The effects of the sintering temperature on the foam ceramics were investigated. The foam ceramics were composed of α-Al 2 O 3 , C-AlPO 4 , and T-AlPO 4 phases. And the mount of T-AlPO 4 phase decreased, while the mount of C-AlPO 4 phase increased once the sintering temperature exceeded 1180℃ due to the phase transformation of T-AlPO4 to C-AlPO4 phase. The grain average size of the foam ceramic increased obviously with the sintering temperature rise, so did its bulk density. While its open porosity decreased. The compression strength of the foam ceramic continuously increased with the sintering temperature rise from 980 to 1580 °C.
Highlights
Alumina porous ceramic has many unique properties, such as high hardness, high temperature resistance, and erosion resistance etc [1,2,3,4].The main materials to form alumina porous ceramics is cheap and easy to get for its rich sources, and the preparation technique is simple
The starting materials included high purity alumina powder (Al2O3, d50=0.5ȝm, 99.99%), H-WF-3 ultra-fine aluminum hydroxide powder (Al(OH)3, d50 = 3.16ȝm, 64.9% alumina), OP emulsifier, polycrystalline alumina fibers (97% alumina), and aluminum dihydrogen- phosphate (Al(H2PO4)3) solution (60 wt%)
The alumina powder, the aluminum hydroxide powder, the OP emulsifier, and the alumina fiber were added into aluminum dihydrogen phosphate solution sequentially to form a mixture
Summary
Alumina porous ceramic has many unique properties, such as high hardness, high temperature resistance, and erosion resistance etc [1,2,3,4].The main materials to form alumina porous ceramics is cheap and easy to get for its rich sources, and the preparation technique is simple. All these imply great commercial value [5]. Delbrücke et al fabricated porous Al2O3 ceramic with porosity of 40.7% and thermal conductivity of 1.63 W/(m·K) by cotton fibers. The effects of the sintering temperature on the foam ceramics were investigated
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