Accession Number : AD0287168

Title :   INORGANIC DIELECTRICS RESEARCH

Corporate Author : RUTGERS - THE STATE UNIV NEW BRUNSWICK N J NEW JERSEY CERAMIC RESEARCH STATION

Personal Author(s) : SMOKE,E.J. ; PHILLIPS,C.J.

Report Date : 01 MAR 1961

Pagination or Media Count : 1

Abstract : Low loss microwave ceramic dielectrics on compounds were investigated in the ternary system La2O3-SiO2-Al2O3. In work on low loss boron nitride ceramic dielectrics bodies containing boron nitride and two undevitrifiable glasses were prepared and evaluated. Hot pressing and sintering were employed in an effort to produce dense translucent aluminum oxide bodies. Theoretical density was achieved by hot pressing but the specimens were contaminated with graphite from the mold used. Temperatures reached in gas firing were not high enough to produce maximum density. Results of thermal conditioning of micromodule wafers having BaTiO3 and TiO2 as their chief crystalline phase are reported. The effects of conditioning upon camber and electrical properties are discussed. The results obtained in the conditioning of wafers are compared with those obtained in the earlier work on rod-shaped specimens. Work on high temperature extrusion of barium titanate is in preliminary stages. A review of the progress made in this area is reported along with a resume of the work reported by Nuclear Metals, Inc. A 150 ton press has been ordered to continue this work. AD-287 1689N3 +++Properties of ceramic dielectric materials for possible use in microwave equipment; crystal formation and methods of preparation of glass containing these materials; mechanical and electrical properties.

Descriptors :   *CERAMIC MATERIALS, *CRYSTAL STRUCTURE, *DIELECTRICS, *FERROELECTRIC MATERIALS, ALUMINATES, BARIUM COMPOUNDS, BORON COMPOUNDS, CALCIUM COMPOUNDS, DENSITY, DIOXIDES, ELECTRICAL PROPERTIES, EXTRUSION, FLAME SPRAYING, GLASS, HEAT TREATMENT, LANTHANUM COMPOUNDS, MANUFACTURING, MECHANICAL PROPERTIES, MICROWAVE EQUIPMENT, NITRIDES, OXIDES, PHOSPHATE GLASS, SILICON COMPOUNDS, TITANATES, TITANIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE