| 摘要 |
PURPOSE:To improve detection sensitivity and detect a fine defect by using amorphous alloy powder 50% of which is amorphous as magnetic powder when detecting a defect part of a ferromagnetic body by a magnetic powder flaw detecting method. CONSTITUTION:Alloy consisting principally of, for example, iron, cobalt, nickel, copper, etc., is used as the amorphous alloy used as magnetic powder, and is manufactured by quenching the fused body of it at an about 10-10<6> deg.C/sec quenching speed or by vapor-deposition, sputtering, electrodeposition, or chemical plating. When a measurement is taken by X-ray diffraction, 50%, preferably, 80%, further preferably, 90% of it is amorphous. The use of this magnetic powder improves the detection precision extremely and a defective magnetic powder pattern is detected with a low detection current of about 130A, so this method provides economy. |
