Effects of vanadium pentoxide on the sintering of ceramic produced in the high PbZrO/sub 3/ region of the system PbZrO/sub 3/-PbTiO/sub 3/

Thesis/Dissertation · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5681144

Starcher, K O

Vanadium pentoxide was added as a sintering aid to calcined PZT 96/4 to lower the sintering temperature of the PZT. No extra PbO was added to the PZT batch, and no provisions were made for a PbO environment during sintering. A Box-Behnken experimental design was employed with the following three factors: wt% V/sub 2/O/sub 5/ added (0.3 to 0.5) sintering temperature (1000 to 1200/sup 0/C), and sintering time (2 to 8 hours). Analysis of the samples included: density, dilatometry, electron microscopy, differential thermal analysis, x-ray diffraction, hysteresis loop, and secondary ion mass spectrometry. Results from dilatometry, differential thermal analysis, and secondary ion mass spectrometry led to the following conclusions on how V/sub 2/O/sub 5/ enhances the sintering of PZT 96/4: (1) a vanadium-bearing phase forms (perhaps a lead vanadate); this phase subsequently melts at approximately 800/sup 0/C; (2) melting of this vanadium-bearing phase results in more rapid sintering; sintered densities greater than 95% theoretical are attainable at sintering temperatures as low as 1000/sup 0/C; (3) the vanadium-bearing compound segregates; vanadium does not diffuse completely and homogeneously into the PZT matrix even after sintering at 1200/sup 0/C for eight hours.

• Research Organization: University of South Florida, Tampa (USA)
• OSTI ID: 5681144
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
SINTERING
PZT
VANADIUM OXIDES
METALLURGICAL EFFECTS
ADDITIVES
DENSITY
PHASE TRANSFORMATIONS
VERY HIGH TEMPERATURE
CHALCOGENIDES
FABRICATION
LEAD COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
ZIRCONATES
ZIRCONIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication