粉体および粉末冶金

電子計算機用高速度メモリー

小林成彬, 鳥居道寛

1968 年 15 巻 2 号 p. 49-54
発行日: 1968/03/25
公開日: 2009/05/22

DOIhttps://doi.org/10.2497/jjspm.15.49

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粉体の粒度と充填性

荒川正文

1968 年 15 巻 2 号 p. 55-61
発行日: 1968/03/25
公開日: 2009/05/22

DOIhttps://doi.org/10.2497/jjspm.15.55

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フェライト製造工程の粉末冶金的解析(第5報)

Mn-Znフェライトの結晶組織と磁気特性と関係

山口喬

1968 年 15 巻 2 号 p. 62-67
発行日: 1968/03/25
公開日: 2009/05/22

DOIhttps://doi.org/10.2497/jjspm.15.62

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Relations between granular structure and magnetic properties of Mn-Zn ferrite are presented. In order to obtain ferrite specimens with different granular structures in the same chemical composition, four powder samples having different grain growth characteristics were prepared from the same raw material mixture under the different calcining and ball-milling conditions, and their compacts were fired under the same temperature.
It is shown that under the conditions studied flux density is determined by the fired density irrespective of the granular structure, but that initial permeability, coercive force and quality factor have much to do with granular structure. It is shown also that the grain size has little effect on the magnetic properties. It is stressed, however, that the intergranular pores are highly responsible for the degradation of magnetic properties.

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WC-10%(Co-Ni)超硬合金の基本的諸性質と炭素量との関係

鈴木寿, 山本孝春

1968 年 15 巻 2 号 p. 68-71
発行日: 1968/03/25
公開日: 2009/12/04

DOIhttps://doi.org/10.2497/jjspm.15.68

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Investigations were made on some fundamental properties of WC-10%(Co-Ni) alloys affected by the carbon content, i.e., the composition of binder phase in the alloys. Specimens were sintered in vacuum at 1375°C for 1.5 hr. Main results obtained were as follows :
(1) The composition of binder phase in the alloys showed a marked change in the two phase region as in the cases of WC-Co, WC-Ni alloys, etc., i.e., the amount of tungsten dissolved in binder phase increased sharply with decreasing carbon content and increased also with increasing nickel content in binder phase.
(2) Therefore, the properties of the alloys lie between those of WC-Co and WC-Ni alloys, as well as they showed regular changes similar to those in other WC-Co base alloys. It is suggested that the mechanical properties of the alloys containing up to about 10% of nickel in binder are nearly the same as those of WC-Co alloys.
(3) With increasing nickel content, the two phase region of the alloys shifted towards the lower carbon side with the extension of that phase region.
(4) Summerizing, the WC-(Co-Ni) alloys were confirmed to situate between WC-Co and WC-Ni alloys.

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炭素粉焼成材の素地組織(I)

国鉄車両用ブラシ材の組織と硬さ

熊谷正博, 寺岡利雄

1968 年 15 巻 2 号 p. 72-79
発行日: 1968/03/25
公開日: 2009/05/22

DOIhttps://doi.org/10.2497/jjspm.15.72

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It is useful to observe the structure of brush material and to measure its hardness, in order to get several informations on the distribution of raw material and its heat treatment condition.
We report in this paper the structure and their hardness of brushes used for the rolling stock of J.N.R. These brushes were polished with electrolytic polisher and the surfaces were observed microscopically. Their hardness were measured by several hardness testers.

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粉体の流動

オリフィスからの自然流出およびその供給装置の試案

内山赳, 種谷真一

1968 年 15 巻 2 号 p. 80-84
発行日: 1968/03/25
公開日: 2009/05/22

DOIhttps://doi.org/10.2497/jjspm.15.80

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