Densification and Shear Deformation in YBa₂Cu₃O_6+δ Powder Compacts

Author

M. N. Rahaman, Missouri University of Science and TechnologyFollow
Lutgard C. De Jonghe
Mayying Chu

Abstract

Powder compacts having a nominal composition of YBa₂Cu₃O_6+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 YBa₂Cu₃O_6+δ powder compacts.

Recommended Citation

M. N. Rahaman et al., "Densification and Shear Deformation in YBa₂Cu₃O_6+δ Powder Compacts," Advanced Ceramic Materials, vol. 3, no. 4, pp. 393 - 397, Wiley-Blackwell, Jul 1988.

The definitive version is available at https://doi.org/10.1111/j.1551-2916.1988.tb00241.x

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0883-5551

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1988 Wiley-Blackwell, All rights reserved.

Publication Date

01 Jul 1988