Melt-Grown Oxide-Metal Composites
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 mA/cm2 were routinely achieved, and attempts to exceed this density were limited by the onset of electrical breakdown in the test diode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1972
- Accession Number
- AD0736929
Entities
People
- Alan T. Chapman
- James F. Benzel
- John W. Hooper
- Reiner J. Gerdes
- Robert K. Feeney
Organizations
- Georgia Tech