Title

Densification and Shear Deformation in YBa2Cu3O6+δ Powder Compacts

Abstract

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.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

8835551

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1988 Wiley-Blackwell, All rights reserved.


Share

 
COinS