Effect of Heterocoagulation on the Preparation of Textured CaBi4Ti4O15 and SrBi4Ti4O15 Made by Reactive-Templated Grain Growth Process

  • Umezawa Kazuhiro
    Department of Applied Chemistry, Faculty of Science and Technology, Keio University
  • Kimura Toshio
    Department of Applied Chemistry, Faculty of Science and Technology, Keio University

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  • RTGG法による結晶配向性CaBi4Ti4O15およびSrBi4Ti4O15の作製におけるヘテロ凝集の影響
  • RTGGホウ ニ ヨル ケッショウ ハイコウセイ CaBi4Ti4O15 オヨビ SrBi4Ti4O15 ノ サクセイ ニ オケル ヘテロ ギョウシュウ ノ エイキョウ

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Abstract

Textured CaBi4Ti4O15 and SrBi4Ti4O15 ceramics have been prepared by the reactive-templated grain growth process. When slurries for tape casting are prepared using a solvent, binder, and plasticizer, large agglomerates are formed in the slurries by heterocoagulation between Bi2O3 and CaCO3 or SrCO3 particles. These agglomerates melt between 800° and 850°C, and the melt penetrates into surrounding powder layers, leaving large voids. Sintering at high temperatures cannot eliminate these voids, resulting in a low density. Furthermore, the voids disturb the alignment of platelike particles surrounding the voids. The use of dispersant in the preparation of the slurries suppresses the formation of the agglomerates, and dense, highly-textured materials are obtained.

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