Accession Number : AD0815703

Title :   THIN METAL FILMS AND THEIR USE IN FILM TYPE RESISTORS (DUNNE METALLSCHICHTEN UND IHRE ANWENDUNG FUR SCHICHTWIDERSTANDE).

Descriptive Note : Unedited rough draft translation,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Personal Author(s) : Schippel, Erhard

Report Date : 21 FEB 1967

Pagination or Media Count : 11

Abstract : Vapor condensation (0.0001) is the only industrially used method for production of thin metal layers on ceramic supports, by vaporization from melt or by sublimation. Problems of reproducibility in physical properties of the layers (resistancy anomalies), structural changes by atom rearrangements, and clusters development (recrystallization) as observed in electron micrographs are demonstrated, as a function of temperature and time, for Ag, Ni, and Cr layers. When the energy is less than that required for reordering and recrystallization, the layer remains in the amorphous state, lacking conduction electrons. A low condition of semiconductory type and a high contamination of the metal with foreign atoms is observed, with a negative temperature coefficient of resistance. Industrial production of ceramic support shapes with vapor-condensed metal layers is described, using a W heating spiral from which the metal is evaporized.

Descriptors :   *METAL FILMS), (*VAPOR PLATING, VACUUM APPARATUS, SILVER, NICKEL, CHROMIUM, CONTAMINATION, ELECTRICAL RESISTANCE, SUBLIMATION.

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE