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Metal-bonded Co-ferrite composites for magnetostrictive torque sensor applications

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6 Author(s)
Chen, Y. ; Ames Lab., Iowa State Univ., Ames, IA, USA ; Snyder, J.E. ; Schwichtenberg, C.R. ; Dennis, K.W.
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A new class of magnetomechanical sensor materials, Co-ferrite (CoO·Fe2O3) and metal-bonded (Ag, Ni, Co) Co-ferrite composites, has been investigated. These materials exhibited magnetostriction in excess of 200 ppm and high d33 (∂λ/∂H)σ coefficient, 1.3×10-9 A-1 m, at low applied field (<100 kA/m). Selected compositions were formed into test samples in the form of rings brazed to stainless steel through-shafts. Changes of surface axial magnetic field in response to applied torque as high as 64 AN-1 m-2 were observed for a demonstration sample of dimensions 25 mm OD, 12.5 mm ID, and 8 mm high. A hysteresis of ±0.5 N·m was observed. These materials appear to be promising candidates for torque sensors, and other magnetostrictive sensor and actuator applications

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )