Abstract
Magnetic head made of polycrystalline ferrite sintered by HIP method is widely used in an audio and video installation. Work damage such as a chipping induced by slicing of ferrite gives rise to the deterioration of an electro-magnetic property of the magnetic head. Micro-crack growth modes of ferrite by an indentation and scribing tests with an diamond indenter are examined in detail by SEM microscopy and by an acoustic emmission method. It is found that micro-crack growth modes are very different among the ferrite materials with same hardness of physical property. Chipping at groove corner yielded by slicing of ferrite with a diamond blade is closely related to micro-crack growth of a grain. AE signal generated by scribing is useful for evaluating the slicing of ferrite.
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