Metal-Grown Oxide-Metal Composites

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1973
Accession Number
AD0776414

Entities

People

  • Alan T. Chapman
  • F. W. Ling
  • J. K. Cochran
  • James F. Benzel
  • Robert K. Feeney

Organizations

  • Georgia Tech

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Assembly
  • Chemistry
  • Composite Materials
  • Composite Structures
  • Controlled Atmospheres
  • Crystal Structure
  • Electrical Conductivity
  • Electron Beams
  • Electron Emission
  • Failure Mode And Effect Analysis
  • Geometry
  • Materials
  • Materials Processing
  • Materials Science
  • Measurement
  • Refractory Metals
  • Voltage

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene