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A mathematical model for gravity-induced distortion during liquid-phase sintering

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An Erratum to this article was published on 01 July 1995

Abstract

Liquid-phase-sintered materials consist of interconnected crystalline grains in a homogeneous matrix phase that forms a liquid during sintering. These composites exhibit viscous flow during sintering that allows densification. Gravitational forces give rise to compact distortion when there is a large amount of liquid at a high temperature. This article treats kinetic aspects of distortion during sintering of tungsten heavy alloys (W-Ni-Fe). The mathematical model predicts distortion and highlights the important variables influencing this phenomenon. The results provide guidelines for minimizing distortion due to gravity. Experiments conducted at several different sintering times show reasonably good agreement with theoretical predictions using the liquid-phase viscosity as a single adjustable parameter. Theoretical predictions of the model are crucial to designing microgravity experiments aimed at understanding dimensional stability.

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Authors and Affiliations

  1. Process Modelling & Design, BDM Federal Corp., 22203-1618, Arlington, VA

    R. Raman (Staff Member)

  2. Pennsylvania State University, University Park, 16802-6809, PA

    Randall M. German (Brush Chair Professor in Materials)

Authors
  1. R. Raman
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  2. Randall M. German
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Additional information

An erratum to this article is available at http://dx.doi.org/10.1007/BF02670780.

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Raman, R., German, R.M. A mathematical model for gravity-induced distortion during liquid-phase sintering. Metall Mater Trans A 26, 653–659 (1995). https://doi.org/10.1007/BF02663915

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  • DOI: https://doi.org/10.1007/BF02663915

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