Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1985-09-30
1987-03-10
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148120, 148314, H01F 102
Patent
active
046489150
ABSTRACT:
A billet made of a polycrystalline Mn-Al-C alloy magnet which is obtained by plastically deforming a Mn-Al-C alloy for magnet such as by extrusion at a temperature of 530.degree. to 830.degree. C. is used for compressive working. When the billet is hollow, it is entirely or locally compressed along the axis of the hollow billet. On the other hand, when the billet is solid, an outer circumferential portion of the billet is compressed. By the compression, the anisotropic structure of the portion where compressed is changed into an anisotropic structure having a direction of easy magnetization in radial directions. The magnet obtained by the method is also disclosed. The magnet has a radially anisotropic structure or novel structures having two different types of anisotropies therein.
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Abdelnour et al., "Permanent Magnet Properties of Mn-Al-C Between -50.degree. C. and 150.degree. C.," IEEE Trans. on Magnetics, vol. MAG-17, No. 6, Nov. 1981, pp. 2651-2653.
Kubo et al., "Anisotropic Mn-Al-C Alloy Permanent Magnets can be Machined and Mass Produced" JEE J. E. Eng, No. 127, Jul. 1977, pp. 50-54.
Ibata Akihiko
Sakamoto Yoichi
Matsushita Electric Industrial Company Ltd.
Sheehan John P.
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