Accession Number:

ADA209185

Title:

Study of Sintered Magnets of the Nd-Fe-B Type

Descriptive Note:

Final rept. Sep 1984-1987

Corporate Author:

DAYTON UNIV OH

Personal Author(s):

Report Date:

1989-02-01

Pagination or Media Count:

92.0

Abstract:

This is the final report of a 3 12-year effort to assess the utility and limitations of Nd-Fe-B based sintered magnets for microwave devices such as traveling wave tubes. In these devices, the magnetic properties at elevated temperatures are of importance, as is the flux stability during thermal cycling and long-term exposure. The experimental work described here involved several tasks 1 the characterization of magnets from industrial RD laboratories and from early pilot production 2 development of our own techniques and the capabilities for preparing Nd-Fe-B alloys and sintered magnets from them 3 modification of the alloy compositions and heat treatments in order to improve the elevated temperature magnetic properties, making the magnets more suitable for applications in the 100 to 200 deg C range at low operating permeance values and 4 the attempt to better understand the magnetization reversal behavior and the relationship between coercivity and microstructure. Keywords Permanent magnets Magnetic stability Coercivity Temperature compensation Traveling wave tubes.

Subject Categories:

  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE