Effect of particle size on microstructure and strength of porous spinel ceramics prepared by pore-forming <Emphasis Type="Italic">in situ</Emphasis> technique |
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Authors: | WEN YAN NAN LI YUANYUAN LI GUANGPING LIU BINGQIANG HAN JULIANG XU |
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Affiliation: | (1) Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan, R.O.C.;; |
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Abstract: | The porous spinel ceramics were prepared from magnesite and bauxite by the pore-forming in situ technique. The characterization of porous spinel ceramics was determined by X-ray diffractometer (XRD), scanning electron
microscopy(SEM), mercury porosimetry measurement etc and the effects of particle size on microstructure and strength were
investigated. It was found that particle size affects strongly on the microstructure and strength. With decreasing particle
size, the pore size distribution occurs from multi-peak mode to bi-peak mode, and lastly to mono-peak mode; the porosity decreases
but strength increases. The most apposite mode is the specimens from the grinded powder with a particle size of 6·53 μm, which
has a high apparent porosity (40%), a high compressive strength (75·6 MPa), a small average pore size (2·53 μm) and a homogeneous
pore size distribution. |
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Keywords: | |
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