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TEMPERATURE COMPENSATION OF BONDED RARE-EARTH MAGNETS BY BLENDING OF ALLOY…

Award Information

Agency:
National Science Foundation
Branch:
N/A
Award ID:
7533
Program Year/Program:
1989 / SBIR
Agency Tracking Number:
7533
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Kjs Associates
1712 Springfield St Dayton, OH 45403
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1989
Title: TEMPERATURE COMPENSATION OF BONDED RARE-EARTH MAGNETS BY BLENDING OF ALLOY POWDERS.
Agency: NSF
Contract: N/A
Award Amount: $227,150.00
 

Abstract:

THIS PROJECT WILL TRY TO DEMONSTRATE A METHOD OF INTERNAL TEMPERATURE COMPENSATION FOR BONDED RARE-EARTH PERMANENT MAGNETS, PARTICULARLY FOR THOSE BASED ON ND-FE-B. THE STRONG TEMPERATURE DEPENDENCE OF THE SPONTANEOUS MAGNETIZATION (M) OF THE LATTER IN THE TYPICAL USE RANGE, O C TO +150 C, IS A PROBLEM IN MANY APPLICATIONS. (MS DROPS QUICKLY AS T INCREASES.) THIS CANNOT BE REMEDIED BY ALLOYING A HEAVY RARE EARTH INTO THE BASIC MAGNETIC PHASE AS IN SINTERED SM-CO-BASED MAGNETS. OUR APPROACH IS TO BLEND COARSE POWDERS OF THE MAIN MAGNETICCONSTITUENT (ND-FE-B OR SM-CO) AND A SECOND HARDMAGNETIC ALLOY THAT HAS A HIGH POSITIVE TEMPERATURE COEFFICIENT (TC) OF MS, THUS LESSENING THE VARIATION OF M WITH T FOR THE COMPOSITE, OR IN THE EXTREME MAKING MS NEARLY CONSTANT. THIS WOULD PERMIT CREATING A WHOLE FAMILY OF BONDED MAGNETS HAVING A RANGE OF TCS FROM ONLY 2 OR 3 MAGNETIC MASTER ALLOYS. THE METHOD IS EQUALLY APPLICABLE TO MATRIX MAGNETS WITH ANY KIND OF BINDER, POLYMERIC, METALLIC, OR OTHER. IT CAN ALSO BE USED TO COMPENSATE SM-CO-BASED MATRIX MAGNETS. IN PHASE I WE WOULD IDENTIFY SUITABLE COMPONENT ALLOY COMPOSITIONS (WHICH MUST BE AVAILABLE IN PRESINTERED FORM WITH HIGH COERCIVITY), ANALYZE THE PM PROPERTIES AND M VS. TOBTAINABLE FROM DIFFERENT BLENDS, AND DEVISE A MATHEMATICAL MODEL FOR "ENGINEERING" THE TEMPERATURE COEFFICIENT. WE WOULD PREPARE A COMPENSATION ALLOY, LEARN EXPERIMENTALLY HOWTO HARDEN IT, PREPARE SOME BONDED MAGNETS FROM POWDER BLENDSAND MEASURE THE TEMPERATURE DEPENDENCE OF THEIR PM PROPERTIES TO PROVE FEASIBILITY OF THE CONCEPT AND VERIFY THE MATHEMATICAL MODEL.

Principal Investigator:

Reinhold Mw Strnat
0

Business Contact:

Small Business Information at Submission:

Kjs Associates
1712 Springfield St Dayton, OH 45403

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No