巻号一覧
51 巻, 2 号
選択された号の論文の8件中1～8を表示しています
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加藤 俊宏, 藤森 啓安, 森田 博昭, 増本 健1980 年 51 巻 2 号 p. 73-79
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーIn order to obtain a high Bs soft amorphous ferromagnet useful for transformer materials and other devices, the magnetic properties of Fe-rich amorphous alloys produced by a single-roller type quenching method was examined.
The properties obtained are significant in high values of the saturation magnetic induction and in low values of the coercive force and the ac core loss.
The composition of metalloids as well as the conditions for the fabrication of amorphous ribbons must be suitably chosen in obtaining the best properties. For example, the alloys of (Fe-Co)80(Si-B)20 in the range of Co/Fe+Co=0.1-0.2 and Si/Si+B=0.25 exhibit about 16000G of saturation magnetic induction, about 7 mOe of coercive force, and about 2×106 of residual magnetic induction to coercive force ratio, which indicates approximately maximum permeability because of the high rectangularity of B-H hysteresis loops. In addition to these static properties, it has been found that these alloys exhibit very small ac core losses at 50Hz or further high frequencies.
These magnetic properties have been quite stable against aging, promising that these alloys will be useful for practical use.抄録全体を表示PDF形式でダウンロード (2781K) -
矢萩 慎一郎, 草加 勝司, 加藤 哲男1980 年 51 巻 2 号 p. 80-89
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーTo obtain high strength Invar alloy for structural components, the effect of Ni and Ti on the thermal expansion of Fe-Ni-Co-Ti alloys was investigated in solution treated, cold drawn and aged condition. Ni content was varied in Fe-Ni-5%Co-3%Ti alloy series and Ti content was varied in Fe-38.5%Ni-5%Co-Ti alloy series. In solution treated condition, (Ni+Co) content corresponding to the minimum thermal expansion coefficient between 30 and 100°C was displaced as much as 1.7wt% by adding 1wt% Ti. And the thermal expansion coefficient between 30 and 100°C was increased about 0.6×10-6/°C by adding 1wt% Ti. The composition displacement was considered as follows; effective (Ni+Co) content could be decreased by adding Ti to Fe-Ni-Co alloys. By cold drawing, thermal expansion coefficient between 100 and 200°C was markedly diminished, while thermal expansion coefficient between 30 and 100°C showed no significant change. Aging Fe-Ni-Co-Ti alloys, high tensile strength was obtained and the shift of Ni content corresponding to the minimum value of thermal expansion was observed. This shift must be originated from the dilution of (Ni+Co) content in the matrix due to the precipitation of Ni-Ti intermetallic compound.抄録全体を表示PDF形式でダウンロード (2514K) -
安保 武志, 元根 隆博, 古谷 嵩司1980 年 51 巻 2 号 p. 90-97
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーIn order to produce a high performance anisotropic plastic bonded magnet which was composed of ferrite powder and thermoplastic material, forming by injection moulding in magnetic field was studied.
The results obtained were as follows;
(1) High magnetic properties were obtained in case that particle size of ferrite powder was 1.0∼1.2μ.
(2) Magnetic properties were greatly increased by annealing of ferrite powder at 950∼1050°C before blending with plastic material.
(3) Br and bHc increased rapidly as a function of higher magnetic field strength, and saturated for about 10000Oe when magnetizing time was over one second.
(4) Increasing of content of ferrite powder in plastics improved magnetic properties, but deteriorated moulding properties. Br 2300∼2500G, bHc 1900∼2300Oe, and (BH)max 1.2∼1.4MGOe were obtained for about 89wt.% of ferrite powder.抄録全体を表示PDF形式でダウンロード (2136K) -
高野 正吉, 古谷 嵩司1980 年 51 巻 2 号 p. 98-103
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーIt is well known that in Si-Fe alloy, with increasing silicon contents, the coercive force becomes lower while the maximum permeability becomes higher.
Alloys containing over 4% silicon, however, are very brittle and not able to be hot and cold rolled. On the other hand, Al-Fe alloys have good workability.
The magnetic properties and workability of the ternary Si-Al-Fe containing Si+Al=3∼8% have been investigated.
The results obtained are as follows:
(1) Hot and cold workability are lowered with increasing of Si and improved by substituting aluminium for a part of silicon in Si-Fe alloy.
(2) Magnetic properties of the 3Si-2Al-Fe alloy show magnetic flux density 14.4kG, coercive force 0.18Oe and maximum permeability 28500 when annealed at 900°C for 4 hours.
(3) 3Si-2Al-Fe alloy is more practical for AC device than 4%Si-Fe alloy because of high electrical resistance, high magnetic flux density and good workability.抄録全体を表示PDF形式でダウンロード (1664K) -
岩間 義郎, 橋本 俊一1980 年 51 巻 2 号 p. 104-115
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーIt is well known that in 1970's rare-earth-cobalt magnets have made a marvelous progress in magnet characteristics of practical permanent magnet materials. Early in the development of the new materials much efforts have been focused on an intermetallic compound of SmCo5 with a very high anisotropy constant, resulting in a successful establishment of production methods of the so-called 1-5 type magnet. Later in 1970's a new development of post-1-5 magnets has commenced to achieve a higher energy product. The guiding princple is to improve their chemical compositions to allow the remanence to exceed that of the 1-5 magnet, as well as to keep the coercivity at a reasonably high level. Recently several kinds of new magnets have been successfully developed whose compositions have been expressed as Sm (Co, TM)z, where z is an appropriate number more than 5, and TM means one or more transition elements involving Cu, Fe, Ti, Mn, Cr, Zr, Ta, Hf, etc. Since the z number has been gradually increased up to 8.5, they are often called as 2-17 type magnets. At present, however, the 2-17 type magnets show a wide variety in the compositions as well as in the mechanism of coercivity. Particularly from a viewpoint of a feature of magnetization curves, it seems likely that they might well be classified into two groups; a nucleation-controlled type and pinning-controlled one. Nevertheless, a detailed explanation of the coercivity mechanism and further seeking for the most desirable composition will be the most important problems on the 2-17 type magnets with futures.抄録全体を表示PDF形式でダウンロード (5100K) -
品川 丞1980 年 51 巻 2 号 p. 116-121
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーA description was made about problems in magnetic core materials for audio magnetic heads, such as deterioration of magnetic properties by resin molding and polishing, temperature dependence of permeability, wear resistance and their solution mainly on the base of research results of Fe-Ni and Fe-Si-Al alloys reported up to now.
Many of those problems have already been resolved, but some problems have still been left to be resolved for instance about high magnetic flux density core materials applied to audio heads for alloy memory medium.抄録全体を表示PDF形式でダウンロード (328K) -
小野 清雄, 河野 富夫1980 年 51 巻 2 号 p. 122-131
発行日: 1980/04/15
公開日: 2009/05/25
ジャーナル フリーThe stability of slufides and selenides consisting of various Cr concentration and the effect of the said stability on corrosion resistance of 18-8 stainless steel have been investigated. The composition of the sulfides and the selenides have been changed by varying Mn concentration of the steels.
Both the sulfides and the selenides extracted from the steels were found to dissolve less with an increase of Cr concentration.
In particular, the selenides did not dissolve in 3% NaCl solution at pH 2.
Similarly, the polarization curves showed that the decomposition potential of the sulfides and selenides became nobler with increasing Cr concentration.
Corrosion resistance of 18-8 steels containing more stable sulfides and selenides of high Cr concentration was superior to that of steels containing conventional MnS and MnSe.抄録全体を表示PDF形式でダウンロード (6023K) -
1980 年 51 巻 2 号 p. 142
発行日: 1980年
公開日: 2009/05/25
ジャーナル フリーPDF形式でダウンロード (43K)
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