Ceramic Eutectics

reportActive / Technical Report | Accession Number: AD0741812 | Open PDF

Abstract:

Metal oxide ingots with fine grain size can be fabricated by growth from the melt. An oriented lamellar-type microstructure free of cracks is developed in the Al2O3ZrO2 eutectic system by controlled solidification with the gradient furnace. The colonies inherent in ingots grown by a modified Bridgman technique have been eliminated and also a lamellar-type rather than a rod-type microstructure is produced in ingots grown with the gradient furnace. Cracking does not occur at the eutectic grain boundaries as it does for polycrystalline aggregates of Al2O3, MgAl2O4, or Y3Al5O12 solidified from the melt.

Author(s):
Schmid, Frederick ; Viechnicki, Dennis J.
Author Organization(s):
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
Descriptive Note:
Technical rept.
Pagination:
0013

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AMMRC-TR-72-8
Project Number(s):
DA-1-T-062105-A-330
Monitor Series:
AMC/DC
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*CERAMIC MATERIALS, *EUTECTICS, MICROSTRUCTURE, ZIRCONIUM OXIDES, ALUMINATES, CRYSTALLIZATION
Field(s)/Group(s):
Ceramics, Refractories and Glass
Keyword(s):
SOLIDIFICATION
Report Date:
1972 Mar 01