Accession Number:

ADP007722

Title:

An Analysis of the Individual Grain Structure of an Oxide Heated using Microwave Radiation and Heated Conventionally,

Descriptive Note:

Corporate Author:

TENNESSEE UNIV KNOXVILLE

Personal Author(s):

• Meek, T. T.
• Zhang, X.
• Rader, M.

Report Date:

1992-04-27

Pagination or Media Count:

13.0

Abstract:

This work examines the structure of an oxide material heated conventionally and in a 2.45 GHz electromagnetic field. Also examined is the structure of the initial starting powder. Of particular interest is the surface structure and the interior bulk structure. TEM analysis indicates that the particle structure differs depending on the processing technique. Based on these findings, a preliminary heating model is introduced which is based on the presence of a liquid phase during sintering. The presence of this liquid phase may account for the apparent lower activation energy for sintering others have reported since their work presumes sintering is due to solid state processes.

Descriptors:

• *CERAMIC MATERIALS
• *MICROWAVES
• ACTIVATION ENERGY
• ELECTROMAGNETIC FIELDS
• ENERGY
• HEATING
• LIQUID PHASES
• LIQUIDS
• MATERIALS
• MODELS
• OXIDES
• PARTICLES
• POWDERS
• PROCESSING
• SINTERING
• SOLIDS
• STRUCTURES
• SURFACES
• GLASS
• SYMPOSIA

Subject Categories:

• Ceramics, Refractories and Glass
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE