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      Initial stage of bi-modal microstructure in TiO 2-doped α-Al 2O 3 ceramics induced by SiO 2 impurity

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          Abstract

          Uni-modal and bi-modal microstructures were concurrently observed in a TiO 2-doped -Al 2O 3 ceramic material with some SiO 2 impurity. The segregation of Ti and Si to grain boundaries was systematically evaluated to reveal their role at the start of anisotropic grain growth. In general, in the bi-modal area grain boundaries exhibit higher Si excess than those in the uni-modal area. However, the basal plane of anisotropic grains was always found to contain more segregated Si while the non-basal planes were found to contain less Si. Such enrichment of SiO 2 was also found at the basal planes of equiaxed grains in the uni-modal area, which occurred in the initial stage of anisotropic grain growth. Before and after this stage, the grain boundary composition was relatively uniform with the mole ratio of SiO 2 to TiO 2 as 2.3: 1 and 5.8: 1, respectively. The latter should be related to the composition of eutectic liquid formed during the sintering, which is responsible for the development of the bi-modal microstructure.

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          Author and article information

          Journal
          ijmr
          International Journal of Materials Research
          Carl Hanser Verlag
          1862-5282
          2195-8556
          2008
          : 99
          : 3
          : 240-244
          Affiliations
          a State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
          b Graduate School of Chinese Academy of Sciences, China
          c Pulvermetallurgisches Laboratorium, Max-Planck-Institut für Metallforschung, Stuttgart, Germany
          Author notes
          [* ] Correspondence address, Prof. Hui Gu, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-xi Rd., Shanghai 200050, China, Tel.: +21 524 12 318, Fax: +21 524 13 122, E-mail: gu@ 123456mail.sic.ac.cn
          Article
          MK101642
          10.3139/146.101642
          © 2008, Carl Hanser Verlag, München
          Page count
          References: 20, Pages: 5
          Product
          Categories
          Basic

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