Accession Number:

ADP007748

Title:

Microstructural Evolution of YBa2Cu3O7-x Using Microwave Energy,

Descriptive Note:

Corporate Author:

FLORIDA UNIV GAINESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Cozzi, A. D.
• Jones, D. K.
• Fathi, Z.
• Clark, D. E.

Report Date:

1992-04-27

Pagination or Media Count:

8.0

Abstract:

Discs of YBa2Cu3 O sub 7-x were sintered at 2.45 GHz in a Raytheon modelQMP2101B-6 microwave oven using hybrid heating. Heating YBa2Cu3 O sub 7-x solely by microwaves is feasible, but a silicon carbide susceptor was used to insulate the discs and provide a more uniform thermal environment. In order to begin with a uniform green microstructure, the discs were slip-cast from a non-aqueous dispersion containing fine YBa2Cu3 O sub 7-x powder. The effects of varying times and temperatures on the microstructural uniformity, densification, and grain growth were investigated using optical and quantitative microscopy.

Descriptors:

• *MICROWAVES
• *YTTRIUM ALLOYS
• *SINTERING
• CARBIDES
• DISPERSIONS
• ENVIRONMENTS
• FINES
• GRAIN GROWTH
• HEATING
• MICROSCOPY
• MICROSTRUCTURE
• MICROWAVE OVENS
• POWDERS
• SILICON
• SILICON CARBIDES
• TEMPERATURE
• UNIFORMS
• SUPERCONDUCTIVITY
• SUPERCONDUCTORS
• SYMPOSIA

Subject Categories:

• Fabrication Metallurgy
• Radiofrequency Wave Propagation
• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE