Accession Number:

AD0736929

Title:

Melt-Grown Oxide-Metal Composites

Descriptive Note:

Semi-annual technical rept. no. 3, 10 Jun-9 Dec 1971

Corporate Author:

GEORGIA INST OF TECH ATLANTA SCHOOL OF CERAMIC ENGINEERING

Report Date:

1972-01-01

Pagination or Media Count:

133.0

Abstract:

Research work is underway developing melt-grown oxide-metal composite structures for electron emission testing. The successful development of Y2O3 stabilized HfO2-W as an additional refractory oxide-metal combination suited for composite growth is reported. Experiments using UO2-Ta mixtures produced extensive areas of Ta fiber growth in this oxide. The question of oxide stoichiometry and its influence on composite growth was extensively considered during all phases of composite growth. As a first step in the theoretical analysis of the emission anticipated from the composite structures, the electric potential distribution was determined in the interelectrode gap for several different array geometries. Experimental electron emission current densities of approximately 100 mAcm2 were routinely achieved, and attempts to exceed this density were limited by the onset of electrical breakdown in the test diode.

Subject Categories:

  • Laminates and Composite Materials
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE