| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of producing high-quality cores in a small lot in producing cores.SOLUTION: An electromagnetic flowmeter 1 comprises: an exciting coil 10 in which magnetic field is generated by energization; and a core 20 made of a magnetic material arranged at the central part of the exciting coil 10. The electromagnetic flowmeter 1 comprises: a measurement pipe 30 which is arranged in the magnetic field generated in the exciting coil 10 and through which fluid flows; and a pair of electrodes 40 fixed to the measurement pipe 30 so as to face in a direction orthogonal to a direction of the magnetic field generated in the exciting coil 20 and a direction of fluid flowing in the measurement pipe 30, and measures a flow rate of fluid when fluid flows between the pair of electrodes 40 on the basis of electromotive force that occurs between the electrodes 40. The core 20 contains alloy expressed by a composition formula: Fe-Si-B-P-Cu(70≤a≤90at%,8.0≤b+c≤26at%,8.0≤c≤25at%,0.20≤d≤5.0at%,0<e≤2.0at%), and the alloy contains amorphous phase and nanocrystal phase.SELECTED DRAWING: Figure 1 |
