Measurement of agglomerate strength distributions in agglomerated powders

Technical Report · Sat Aug 01 04:00:00 EDT 1987

OSTI ID:6117596

Ciftcioglu, M

A new technique for measuring the strength distributions of powder agglomerates involves the use of a calibrated ultrasonic sound field. Agglomerate strength distributions were measured for a variety of yttria and yttria-stabilized zirconia powders. Different preparation methods were used in order to obtain powders containing agglomerates with different characteristics. Special yttria powders containing agglomerates of 0.1 ..mu..m, spherical, monosize spheres were also prepared. BET surface area, tap density, pressed density, compaction curves, and mercury intrusion curves were also obtained. The powders were pressed and sintered, and the sintered density measured for each pellet. Smooth curves could be drawn when agglomerate strength was plotted against sintered density; the sintered density of the powders also could be ranked directly according to the strength of the agglomerates in each powder. Except for the model yttria powders containing monosize spherical particles, there was no correlation between sintered density and any other measured powder parameter. For this model powder, most of measured powder parameters correlated directly with sintered density, in almost textbook fashion. It was also possible, using these model powders, to isolate the effect of agglomerate strength on sintered density by holding all other powder characteristics constant.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6117596
• Report Number(s): IS-T-1325; ON: DE87013605
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
AGGLOMERATION
CHALCOGENIDES
CORRELATIONS
DENSITY
FABRICATION
GLASS
MATERIALS
MICROSPHERES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
SINTERED MATERIALS
SINTERING
SOUND WAVES
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC WAVES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES