Sintering of ZnO: I, Densification and Grain Growth*

Authors

  • T. K. GUPTA,

    1. Ceramics Division, Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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    • Now senior engineer, Westinghouse Electric Corporation, Research and Development Center, Pittsburgh, Pennsylvania 15235.

  • R. L. COBLE

    1. Ceramics Division, Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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  • Based on a thesis submitted by T. K. Gupta for the Doctor of Science degree in ceramics at the Massachusetts Institute of Technology.

  • Supported by the United States Atomic Energy Commission under Contract AT(30-1)-2574.

  • *

    For Part I1 of this paper, see pp. 525-28, this issue.

Abstract

Densification and grain growth rates at the intermediate stage of the sintering of pressed zinc oxide pellets were measured in air and oxygen. Application of a lattice diffusion model to the results gave calculated diffusion coefficients in good agreement with directly measured diffusion coefficients for zinc. The change of atmosphere from air to oxygen resulted in lowering of grain size and calculated diffusivity; the diffusion decrease is consistent with lattice diffusivity of zinc occurring by an interstitial mechanism. The results can be expressed by the relations:

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in air, and

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in oxygen, from 900° to 100°C.

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