Accession Number:

ADA277154

Title:

Processing and Characterization of Functionally Gradient Ceramic Materials

Descriptive Note:

Final rept.

Corporate Author:

ARMY RESEARCH LAB ADELPHI MD

Report Date:

1994-02-01

Pagination or Media Count:

20.0

Abstract:

Tape casting of ceramic materials offers the flexibility of gradually altering the electronic or structural properties of two dissimilar systems in order to improve their compatibility. This research outlines the processing and fabrication of two systems-of functionally gradient materials. The systems are both electronic ceramic composites consisting Ba1-xSrxTiO3 BSTO and alumina or a second oxide additive. These composites would be used in phased array antenna systems, therefore, the electronic properties of the material have specific requirements in the microwave frequency regions. The composition of the tapes are varied to provide a graded dielectric constant, which gradually increases from that of air dielectric constant 1 to that of the ceramic dielectric constant 1500. This allows maximum penetration of incident microwave radiation as well as minimum energy dissipation and insertion loss into the entire phase shifting device.

Subject Categories:

  • Electrical and Electronic Equipment
  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE