水溶液系プロセスによる窒化ケイ素粉末表面への焼結助剤の高分散担持

概要

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Highly dispersive loading of Y^<3+> ions, as a sintering aid, on Si_3N_4 powder via aqueous processing has been presented. The chemical stability of Si_3N_4 powder in pressured and saturated water vapor was improved by a chemical surface modification with dicarboxylic sebacic acid, while maintaining hydrophilic surface. The treatment of the sebacic acid-modified powder with yttrium acetate tetrahydrate resulted in strong immobilization of Y^<3+> ions at a highly dispersive level on the Si_3N_4 powder surface through ion-exchange with the free carboxyl groups of the sebacic acid molecules attached to the Si_3N_4 surface. The highly dispersive sintering aid promoted hot-press densification of Si_3N_4 even with a small loading amount, in comparison with materials added with Y_2O_3 powder as a sintering aid.
2000-09-01