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Nondestructive Testing, 5. Magnetic and electromagnetic engineering

: Dobmann, G.

Ullmann's Encyclopedia of Industrial Chemistry. 7th Edition
Weinheim: Wiley-VCH, 2011
ISBN: 978-3-527-32943-4
ISBN: 9783527306732
21 S.
Aufsatz in Buch
Fraunhofer IZFP ()
3MA; micromagnetic testing; eddy-current inspection; microwave inspection

Magnetic particles become attached to the surface and to some subsurface discontinuities when a ferromagnetic test piece is magnetized. The particles (e.g., iron or soft ferrite), which have high permeability and low coercive force, are coated with colored or fluorescent pigments for increased visibility. They are applied as dry particles or as suspensions in water or oil. Magnetic leakage fields of a discontinuity collect the particles, indicating their location, size, and shape by color contrast or fluorescence. Nonmagnetic materials cannot be tested with this method.