Densification and shear deformation in YBa sub 2 Cu sub 3 O sub 6+. delta. powder compacts

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1988.tb00241.x· OSTI ID:6113904

Rahaman, M N ^[1]; de Jonghe, L C; Chu, May-ying ^[2]

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1. Univ. of Missouri, Rolla (USA)
2. Lawrence Berkeley Lab., CA (USA)

Powder compacts having a nominal composition of YBa{sub 2}Cu{sub 3}O{sub 6+{delta}} were sintered in air between 910{degree} to 940{degree}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 {approx} 2 h at 935{degree}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 {approx} 0.8 over the density range 0.6 to 0.8, and the sintering stress, which was {approx} 0.8 over the density range 0.6 to 0.8, and the sintering stress, which was {approx} 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 ({approx} 1 MPa) during sintering of YBa{sub 2}Cu{sub 3}O{sub 6+{delta}} powder compacts.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6113904
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 3:4; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
DEFORMATION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FABRICATION
HIGH-TC SUPERCONDUCTORS
INFORMATION
MEASURING METHODS
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SINTERING
STRESS ANALYSIS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES