Generation Behavior of Edge-Chipping of Polycrystalline Ferrites Having Different Fracture Modes in Slot Grinding.

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  • 破壊形態の異なる多結晶フェライトの溝研削におけるエッジチッピングの生成挙動
  • ハカイ ケイタイ ノ コトナル タケッショウ フェライト ノ コウケンサク ニ

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Abstract

Precise slot grinding experiments were conducted on two kinds of polycrystalline Mu-Zn ferrites, which showed intergranular and transgranular fracture, respectively, to investigate the influences on fracture mode of changes in size and shape of the edge-chipping. In the case of using fine grain, maximum chipping size of transgranular-fracture-type ferrite was smaller than that of the inter-granular fracture type ; however, in the case of using coarse grain, maximum chipping size was reversely to the case of using fine grain. This reversed phenomenon was explained based on the differences in fracture mode of the materials. The percentages of intergranular fracture of these materials were examined in detail by SEM observation. The transgranular fracture type was suitable for precise slot grinding using fine grain. On the other hand, the intergranular fracture type was suitable for normal slot grinding using coarse grain. As a result, new technology for reducing the edge chipping which controls the grain boundary strength using an additive was developed.

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