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説明:

Processing-induced defects affect the performance and reliability of multilayered ceramics. They are introduced from the raw powder, or during tape casting, drying, thermo-compression, binder burnout, and sintering. Using synchrotron X-ray multiscale tomography, we investigated how the microstructural heterogeneities and various defects evolve in the sintering of tape-cast alumina laminate. The strength-limiting defects were identified as large defects at the layer interface and peculiar crack-like defects formed around large inclusions contained in the raw powder. Although a slurry might be uniform in colloidal processing, the particle packing in the tape was heterogeneous. This heterogeneity determined the spatial distribution of pores and formed complex pores in later stages. Moreover, we found the formation of flake-like sheets in slurry due to the self-assembly of polyhedral alumina crystals. This phenomenon has the potential to be applied in the manufacture of 2D micro-sheets controlled to the thickness of a single particle.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  © 2024.
  Licensed under the Creative Commons https://creativecommons.org/licenses/by-nc-nd/4.0/.

キーワード: Sintering , Synchrotron X-ray tomography , 3D microstructure , Ceramic tape casting

刊行年月日: 2024-04-10

出版者: Elsevier BV

掲載誌:

• Ceramics International (ISSN: 02728842) vol. 50 issue. 19 p. 37402-37411

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4671

公開URL: https://doi.org/10.1016/j.ceramint.2024.04.096

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更新時刻: 2024-08-22 14:43:41 +0900

MDRでの公開時刻: 2026-04-11 08:19:59 +0900