Metal-Grown Oxide-Metal Composites

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Abstract:

The research program was designed to develop melt-grown oxide-metal composite structures for high field electron emission testing. A variety of refractory oxide-metal mixtures i.e. UO2-W, stabilized ZrO2 and HfO2-W, UO2-Ta, and the rare earth oxides of Gd2O3, Nd2O3 and La2O3-Mo and W were successfully induction melted and unidirectionally solidified to form aligned metallic fibers embedded in the oxide matrix. Metal solubility in the molten oxides, control of the oxide stoichiometry and metal volatility were shown to be significant parameters controlling the successful composite growth in these systems. Emission measurements were performed with a variety of unusual emitter geometries, including metallic coated samples and structures designed to operate at low voltages 100V. Analysis of post-emission damage and emission performance were used to assess the probable failure mechanism limiting the current density and life of the oxide-metal cathode structures.

Author(s):
Chapman, Alan T. ; Benzel, James F. ; Cochran, J. K. ; Feeney, Robert K. ; Ling, F. W.
Author Organization(s):
GEORGIA INST OF TECH ATLANTA SCHOOL OF CERAMIC ENGINEERING
Descriptive Note:
Final technical rept. 10 Jun 1971-31 Dec 1973
Supplementary Note:
See also AD759507.
Pagination:
0235

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):
E18-604-6
Contract/Grant Number(s):
DAAH01-71-C-1046, ARPA ORDER-1637
Monitor Series:
DARPA
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.7_Experimentation; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_6_Net Centric; JCA_1_Force Support; JCA_1.2.5_Lessons Learned; JCA_1.3_Human Capital Management; JCA_3.2.2_Non-Kinetic Means; JCA_4.3_Maintain; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_1.3.2_Personnel Management; JCA_6.2.1_Information Sharing; JCA_6.2.2_Computing Services; JCA_6.4.1_Secure Information Exchange
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*CERAMIC MATERIALS, *FIBER REINFORCED COMPOSITES, *FIELD EMISSION, CERIUM COMPOUNDS, ELECTRON EMISSION, FIBERS, GADOLINIUM COMPOUNDS, METALS, MOLYBDENUM, OXIDES, RARE EARTH COMPOUNDS, REFRACTORY METALS, SOLIDIFICATION, TUNGSTEN, URANIUM COMPOUNDS
Field(s)/Group(s):
Electrical and Electronic Equipment, Ceramics, Refractories and Glass, Laminates and Composite Materials
Keyword(s):
Eutectic composites, Metal fibers, Cerium oxides, Uranium oxides, Gadolinium oxides, Neodymium oxides, Lanthanum oxides
Report Date:
1973 Dec 01