Laminated magnetic core and method of manufacturing same

Details Laminated magnetic core and method of manufacturing same Laminated magnetic core and method of manufacturing same

1991-11-18

1994-05-17

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

296021, 148122, 156155, 156184, 360120, 428216, B32B 300

Patent

active

053125037

ABSTRACT:
A laminated magnetic core is characterized in that core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m are laminated together with a sheet-to-sheet distance of 2 to 10 .mu.m, desirably 3 to 6 .mu.m and that at least a part of protruded portions of the opposite roughed surfaces is diffusion-bonded to each other at the interface between adjacent thin sheets. The laminated magnetic core may have innumberable voids present at the diffusion-bonded interface between the adjacent thin sheets. This invention further provides a method of manufacturing a laminated magnetic core comprising the steps of providing a plurality of core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m; laminating and bonding said core-forming thin sheets one upon another through an organic adhesive, desirably at a sheet-to-sheet distance of 2 to 10 .mu.m; punching out a block of a given shape from said laminated and bonded core-forming sheets by a press; and thereafter magnetically annealing the block while decomposing and vaporizing said organic adhesive to effect diffusion-bonding at the interface between adjacent thin sheets of the block lefting innumberable voids at the interface.

REFERENCES:
patent: 3010185 (1961-11-01), Hume
patent: 3614830 (1971-10-01), Bate et al.
patent: 3666588 (1972-05-01), Wanesky
patent: 4288260 (1981-09-01), Senno
patent: 4488195 (1984-12-01), Yanagiuchi et al.
patent: 4543208 (1985-09-01), Horie et al.
patent: 4948656 (1990-08-01), Schoeu

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