磁性ゴムの電磁特性とそのレオロジー : 分散系のレオロジー : レオロジー特集号
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概要
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It is known that when barium-ferrite powder mixed in rubber is charged in a strong magnetic field, it turns into an elastic permanent magnet. But, when ferrite powder is mixed at random, the magnet obtained gives the same properties of any directions (isotropy). On the other hand, when the ferrite grains are arranged to line up along a given direction within the base rubber, an anisotropic rubber magnet which has particularly an excellent magnetic property can be obtained. Beside the widely adopted method of moulding in magnetic field for isomering of sintered magnet, we tried the rolling method on a calendering machine in an attempt to make the crystallizing axis of ferrite grains lie along a given direction inside the rubber, and obtained quite a good result. That is, the unvulcanized rubber stock into which the ferrite powder is mixed is thinned down on a calender-roll through repeated operations. The test piece thus processed showed the maximum energy product, (B.H.)_<max>≒0.7×10^6 Although it may also differ according to the shape and variation of grain size of ferrite, the muximum mixable quantity into the rubber greatly differs according to kinds of base rubber. Natural rubber, butyl rubber, etc. are considered suitable for high loaded compounds, while silicon rubber, polysulfide rubber, etc. are not suitable for binders. We also made experiment on the relationship between properties magnetic and rubberic, and mixing quantities of ferrite powder.
- 1962-05-15
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関連論文
- 磁性ゴムの電磁特性とそのレオロジー : 分散系のレオロジー : レオロジー特集号
- Some Properties of Magnetic Rubber and Their Industrial Use