Effect of green density on the thermomechanical properties of a ceramic during sintering

  • Schoenberg S
  • Green D
  • Messing G
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Abstract

The thermomechanical properties of a commercial barium titanate were
experimentally or theoretically determined for samples with green
densities ranging from 45% to 55%. For stresses less than 300 kPa,
sample deformation was determined to be linear viscous for all three
stages of sintering. The shrinkage rates at a given temperature can
differ by up to 223C25% as the green density changes from 45% to
55%, and the maximum shrinkage rate increased with decreasing green
density. The increase in shrinkage rate with lower green density
samples persisted through the final sintering stage. The viscosity
was determined by cyclic loading dilatometry to range from 5 to 6
GPa�s in the initial stage of sintering, to 2 GPa�s in the intermediate
stage, and to increase to 10201320 GPa�s for all specimens in the
final stage of sintering. Differences in the final-stage viscosity
were attributed to grain size differences. Relaxation times for the
sintering body were estimated to be less than 1 s, indicating that
viscous behavior is dominant throughout the sintering process.

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Authors

  • Gary MessingThe Pennsylvania State University, University Park, Pennsylvania

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  • Sam E. Schoenberg

  • David J. Green

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