Densification and Shear Deformation in YBa2Cu3O6+δ Powder Compacts
Powder compacts having a nominal composition of YBa2Cu3O6+δ were sintered in air between 910° to 940°C in a loading dilatometer that permitted the application of small, controlled uniaxial stresses to the sintering compact. The highest density (95% of theoretical) was obtained after sintering without load for ≅2 h at 935°C. The application of constant, small uniaxial stresses produced extensive shear deformation and a small increase in the densification rate. The measured ratio of the densification rate to the creep rate provided strong support for the presence of a liquid phase during sintering. The data allowed the measurement of the ratio of the creep viscosity to the densification viscosity, which was ≅0.8 over the density range 0.6 to 0.8, and the sintering stress, which was ≅400 kPa. These data show that extensive shear deformation and small but measurable increases in the densification rates may be achieved by the application of relatively small uniaxial stresses (≅1 MPa) during sintering of YBa2Cu3O6+δ powder compacts.
M. N. Rahaman et al., "Densification and Shear Deformation in YBa2Cu3O6+δ Powder Compacts," Advanced Ceramic Materials, vol. 3, no. 4, pp. 393-397, Wiley-Blackwell, Jul 1988.
The definitive version is available at http://dx.doi.org/10.1111/j.1551-2916.1988.tb00241.x
Materials Science and Engineering
International Standard Serial Number (ISSN)
Article - Journal
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