High Performance 2:17 Permanent Magnets for Traveling Wave Tubes

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: DASG60-01-C-0081
Agency Tracking Number: 00-0439
Amount: $722,893.00
Phase: Phase II
Program: SBIR
Awards Year: 2001
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
924 Links Avenue, Landisville, PA, 17538
DUNS: 056771686
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Christina Chen
 Senior Engineer
 (717) 898-2294
Business Contact
 Michael Walmer
Title: President
Phone: (717) 898-2294
Email: mhw@electronenergy.com
Research Institution
The objective of this effort is to develop high performance rare earth permanent magnets with essentially constant magnet properties over a wide temperature range of -50 to 350oC, and which can survive temperatures as high as 500oC, for TWT applications.The combination of a light rare earth (Sm) with heavy rare earths (Gd, Er, and Ho) provides very low temperature coefficients of magnetic properties over a wide temperature range. We propose to complete the development of new (Sm, Er, Gd, Ho) 2TMM17magnets that possess near zero temperature coefficients of magnetization over a broad range of temperature. Our approaches to extend the compensation temperature and to significantly improve the energy product of temperature compensated permanent magnetsare (1) to us Ho and Er to extend the temperature of peak magnetization (Tp) since Ho and Er compounds have a much higher Tp than Gd compounds used in current temperature compensated magnets; (2) to use Ho and Er to improve magnetization at hightemperature; (3) to use Gd to maintain useful high coercivity; and (4) make new sintered temperature compensated permanent magnets with (Sm,Gd,Er,Ho) TM13 as the main phase since this 1:13 phase has high magnetization, high Curie temperature, and high Tp.The payoff for DoD and commercial systems includes temperature compensated high temperature permanent magnets that permit TWTs to operated at higher temperatures and minimize the system cooling requirements and weight. The use of permanent magnets thatcan withstand the bakeout process will permit simplification of the permanent magnet designs, improve beam focusing, and reduce TWT manufacturing costs. Using magnets that provide a near-constant focusing field over broad temperature range will improvesystem performance and tube life, and reduce the final focusing and test labor costs.

* Information listed above is at the time of submission. *

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