Accession Number : AD0684501

Title :   MAGNETIC-CRYSTALLOGRAPHIC ORIENTATION PRODUCED IN FERRITES BY HOT WORKING.

Descriptive Note : Annual rept. 15 Mar 68-14 Mar 69,

Corporate Author : AVCO GOVERNMENT PRODUCTS GROUP LOWELL MASS AVCO SPACE SYSTEMS DIV

Personal Author(s) : Haag,Robert M.

Report Date : 14 MAR 1969

Pagination or Media Count : 40

Abstract : Hot forging of barium cobalt ferrite and barium ferrite gives rise to orientation of the crystallites in a polycrystalline body, with the basal planes of the hexagonal unit cells are aligned perpendicular to the forging direction. Microstructurally the body consists of platelets with their small dimension parallel to the c-axis of the crystallographic unit cell and parallel to the forging direction. Magnetic measurements show the magnetic permeability of the oriented borium cobalt ferrite to be two and one-half to three times as great as that of randomly oriented material prepared by hot pressing. At 2000 MHz the relative permeability of the oriented material is 7. Nickel-zinc ferrite with the cubic spinel structure was forged to 60% reduction without appreciable effect on the degree of orientation. (Author)

Descriptors :   (*FERRITES, *HOT WORKING), INTERMETALLIC COMPOUNDS, MAGNETIC PROPERTIES, ISOTROPISM, SPINEL, X RAY DIFFRACTION, HOT PRESSING, CRYSTAL STRUCTURE, NICKEL ALLOYS, IRON ALLOYS, BARIUM ALLOYS, OXIDES, POWDER METALLURGY

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE