Sendust Sheet-Processing Techniques and Magnetic Properties

Abstract
A procedure has been developed whereby the brittle magnetic alloy of silicon, aluminum, and iron (Sendust) can be produced in sheet from through metal powder rolling techniques. Ring laminations stamped from this sheet at 0.014 in. thickness have the following dc properties: μ20=16 130; μmax=36 625; Hc=0.062 Oe; Br=3450 G; Bm=8960 G. High frequency (<1 Mc/sec) loss values were lower than in laminated molybdenum Permalloy cores of the same thickness. The nominal Sendust composition is 9.5% silicon, 5.7% aluminum, and balance iron. This new process should make possible more extensive use of Sendust in applications that can take advantage of its remarkable intrinsic characteristics such as high initial permeability, high resistivity, low magnetostriction, and low magnetocrystalline anisotropy.

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