Surface Modification of Silicon Nitride Powder with Aluminum |
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| Authors: | K R Han C S Lim M J Hong S K Choi S H Kwon |
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| Affiliation: | Division of Ceramics, Korea Institute of Science and Technology, Cheongryang, Seoul 131, Korea;Keuni Kang Ltd., Yongin, Korea |
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| Abstract: | Surface modification of Si3N4 with alumina was tried. It was achieved by simply mixing Si3N4 powder with an alumina sol up to ～2 wt% as alumina in an aqueous medium, dried, and followed by calcination at 400°C for 1 h. A TEM micrograph showed a coating layer of ～15 nm thickness. The isoelectric point of the modified Si3N4 powder with porous alumina was at pH 7.8, which is different from 5.8 and 8.6 for Si3N4 and amorphous alumina, respectively. |
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