巻号一覧
11 巻 (1964)
- 6 号 p. 281-
- 5 号 p. 223-
- 4 号 p. 175-
- 3 号 p. 125-
- 2 号 p. 57-
- 1 号 p. 3-
11 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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Fe焼結体の焼結による寸法変化に対する添加元素の影響藤井 康次1964 年 11 巻 5 号 p. 223-230
発行日: 1964/10/25
公開日: 2009/12/04
ジャーナル フリーThe densification during sintering of iron powder compacts with a small addition of phosphorus, antimony, boron, sulphur and copper respectively, was discussed. Specimens were prepared by mixing iron powder with additive powder, followed by compacting and sintering for 1 hr at 1150-1200°C in hydrogen.
It has been shown from experimental results that the sintering of iron is accelerated by phosphorus or antimony addition, but not accelerated by boron, sulphur or copper addition. In the case of phosphorus or antimony addition, the crystal structure of iron alloy equilibrated at sintering temperature is α phase (bcc lattice) and in the other case that is γ phase (fcc lattice). The diffusion velocity in γ phase is much smaller than in α phase. Examining on the basis of the Kingery's equation, the ratio of the diffusion coefficient in α phase to that in γ phase was in the range of 140 to 250. These values are comparable with the ratio of the self-diffusion coefficient of α-iron to that of γ-iron at the sintering temperature (1150-1200°C). After all, whether or not the sintering of iron powder compact is accelerated by a additive powder depends upon the crystal structure of the sintering iron body equilibrated at the sintering temperature.
According to Meechan's experimental results, the rate process of the sintering of α-iron might be the ring diffusion rather than the vacancy diffusion. However, when the α phase of iron of the sintering body is stabilized by the additives, the sintering process maybe proceed by the vacancy diffusion.抄録全体を表示PDF形式でダウンロード (570K) -
Fe-Cu焼結体の焼結による寸法変化に対する添加元素の影響藤井 康次1964 年 11 巻 5 号 p. 231-235
発行日: 1964/10/25
公開日: 2009/12/04
ジャーナル フリーIt has been shown previously that the sintering of the plain iron powder compacts are accelerated by the small additions of phosphorus, and not accelerated by boron, sulphur or copper.
Moreover, it has been well known that iron-copper, mixtures assume different dimensional changes with the variation of copper contents and this phenomenon is called as "copper growth".
Experimental results have shown that the densification of iron-copper mixtures during sintering is accelerated by the small additions of phosphorus. Therefore, if the addition of phosphorus is enough to offset the expansion of the iron-copper compacts due to the copper growth, both the expansion and the shrinkage of the iron-copper compacts will not be observed by sintering. The addition of Cu3P also has the same effect as phosphorus.抄録全体を表示PDF形式でダウンロード (304K) -
田村 皖司, 野田 竜彦1964 年 11 巻 5 号 p. 236-242
発行日: 1964/10/25
公開日: 2009/05/22
ジャーナル フリーResults are presented of an investigation on the production of stainless steel strips, from the atomized powder AISI 316L. Compacting rolls, 300mm in dia. and 336mm long, are of the horizontal type. The effect of the roll gap, roll speed and feed rate of powder on the quality and output of green strips are described. To prevent the side flow of powder during the rolling, a side plate is set on the rolls. It is found that the use of the plate is effective not only in producing a sound green strip but also in reducing the powder loss. The green strip is cold re-rolled 15%, and then sintered, re-cold rolled and annealed. Sintering and annealing are carried out in a vacum (1×10-5mmHg). Mecanical properties of the fully processed strip are comparable with those of the conventionally produced material.抄録全体を表示PDF形式でダウンロード (5910K) -
柴 是行, 半田 宗男1964 年 11 巻 5 号 p. 243-251
発行日: 1964/10/25
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (603K)
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