Extrusion-compression method for producing bonded permanent magnets

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United States of America Patent

PATENT NO 12205739
APP PUB NO 20220157499A1
SERIAL NO

17529588

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Abstract

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A method for producing a bonded magnet, comprising: (i) low-shear compounding of a thermoplastic polymer and magnetic particles to form an initial homogeneous mixture thereof; (ii) feeding the initial homogeneous mixture into a plasticator comprising a low-shear single screw rotating unidirectionally toward a die orifice and housed within a heated barrel to result in heating of the initial homogeneous mixture until the thermoplastic polymer melts and forms a further homogeneous mixture, wherein said further homogeneous mixture is transported within threads of the single screw towards the die orifice and exits the die orifice as a solid pellet; (iii) conveying the solid pellet into a mold and compression molding the pellet in the mold, to form the bonded magnet, wherein the bonded magnet possesses a magnetic particle loading of at least 80 vol % and exhibits one or more magnetic properties varying by less than 5% throughout the bonded magnet.

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Patent Owner(s)

Patent OwnerAddress
UT-BATTELLE LLC5002 MS-6265 ONE BETHEL VALLEY ROAD OAK RIDGE TN 37831-6265

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hassen, Ahmed A Knoxville, US 16 11
Kunc, Vlastimil Knoxville, US 38 345
Paranthaman, Mariappan Parans Knoxville, US 42 250
Vaidya, Uday Kumar Birmingham, US 5 13

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