Pore Growth and Shrinkage During Sintering

  • O. J. Whittemore
  • J. A. Varela

Abstract

Since the driving force for sintering is the reduction of free surface area, the initial loss of surface should be considered the initial sintering stage. Surface loss is accompanied by changes in pore size, usually pore growth and sometimes accompanied by shrinkage. Pore growth has been observed in sintering Al2O3, amorphous SiO2- Al2O3, Fe2O3, MgO, SnO2, TiO2 and ZnO by mercury porosimetry and by nitrogen adsorption. Water vapor in the sintering atmosphere has greatly accelerated pore growth. Some explanations are: particle size distributions, rearrangement, varying coalescence, surface diffusion, evaporation/condensation, and phase transformation.

Keywords

Pore Size Distribution Surface Diffusion Water Vapor Pressure Mercury Porosimetry Pore Size Distribution Curve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Elsevier Science Publishers Ltd 1990

Authors and Affiliations

  • O. J. Whittemore
    • 1
  • J. A. Varela
    • 2
  1. 1.University of WashingtonUSA
  2. 2.Universidade Estadual PaulistaBrazil

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