巻号一覧
31 巻, 4 号
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
-
牧野 和孝, 山田 昌治, 船木 澄子, 倉光 鋼太郎1984 年 31 巻 4 号 p. 122-124
発行日: 1984/06/25
公開日: 2009/05/22
ジャーナル フリーThe behavior of particulate materials in general particulate processes can not be discussed without the consideration of dynamic factors. For example, if the discharge valve of a particulate hopper is opened, it will be observed that the discontinuity boundary of the bulk density is transfered upward in it storage. This phenomenon is expected to be solved as one of the most urgent problems for the establishment of the systematic design method of a discharge valve, but has not been elucidated yet. From this standpoint, in this paper, the transmission mechanism of the bulk density in mobilized particulate materials is fundamentally and experimentally discussed. As a result, it is pointed out that the bulk density in mobilized particulate materials has the property of a kinematic wave.抄録全体を表示PDF形式でダウンロード (170K) -
牧野 和孝, 山田 昌治, 東山 明, 倉光 鋼太郎1984 年 31 巻 4 号 p. 125-129
発行日: 1984/06/25
公開日: 2009/05/22
ジャーナル フリーIn the design and operation of general industrial particulate processes, the elucidation on the mechanism of the formation of bulk density distribution can be taken to be one of the most urgent problems which should be solved. However, it has not yet been elucidated sufficiently. Then, in this paper, the reflection phenomena of a loose bulk density zone to a solid wall are noticed and fundamentally discussed. As a result, it is pointed out that the sum of the incidence angle and the reflection one to a solid wall should equal to that of the internal friction angle of the particulate material and the wall friction angle. That indicates the fundamental condition of incidence-reflection of a loose bulk density zone to a solid wall. And it is shown that this condition is consistent with the experimental results by X-ray radiographs of the reflected loose bulk density zone to a solid wall, formed in the experiments of plunger penetration. This fact can be taken to be an important information to the fundamental discussions of the bulk density distribution formed in such a vessel of particulate processes.抄録全体を表示PDF形式でダウンロード (329K) -
池上 隆康, 垣尾 寿彦, 千田 幸雄, 守吉 佑介1984 年 31 巻 4 号 p. 130-135
発行日: 1984/06/25
公開日: 2009/05/22
ジャーナル フリーAn alum-derived Al2O3 powder and aluminum hydroxide one were calcined at 1280°C for 2 h in flowing 02. Both the resultant powders had similar primary particles in size ( ?? 0.2 μm). The latter had smaller aggregates (<3μm) than the former (<5 μm), but was nonsinterable. This nonsinterable behavior was explained from the hard aggregates and from the appreciable contribution of the surface diffusion of atoms toward the sintering of this powder. The porous aggregates of the alum-derived Al2O3 powder, having randomly arranged primary particles, that is, very dispersed pore sizes were easily disintegrated not only by ball-milling but also by pressing at 200 MPa, and the narrow dispersion of small pores (0.05-0.073 μm) in the green compact was considered to be one of origins for the sinterable behavior of this powder.抄録全体を表示PDF形式でダウンロード (1853K) -
林 宏爾, 鈴木 寿, 土井 良彦1984 年 31 巻 4 号 p. 136-140
発行日: 1984/06/25
公開日: 2009/05/22
ジャーナル フリーThe transverse-rupture strength of WC-5, 10%Co alloys coated with a titanium carbide (TiC) layer of 2-10 /μm by CVD process was investigated in relation to the carbon content of substrate alloys. Substrate alloys were ranged from two-phase to three-phase ones containing free carbon.
It was found that the strength of coated alloys did not almost change according to the carbon content of substrates, in contrast to the strength of substrates. This phenomenon was due to the fact that the thickness of n-containing layer formed at the interface between TiC layer and substrate became thinner with increasing carbon contents at a fixed thickness of TiC layer, so that the decrease in the substrate strength with increasing carbon content was compensated. In addition, when free carbon contained substrates were applied, it was noted that TiC layer was fine-grained and rich in dissolved tungsten, and cobalt layer was formed at the interface.抄録全体を表示PDF形式でダウンロード (1827K) -
焼結中の液相について森下 政夫, 永井 宏, 庄司 啓一郎1984 年 31 巻 4 号 p. 141-145
発行日: 1984/06/25
公開日: 2009/12/04
ジャーナル フリーThe structures formed during equilibrium solidification and sintering process of nickel base superalloy IN-100 were investigated.
The results obtained were as follows:
(1) During equilibrium solidification, four kinds of reaction, P1 (1610-1583K), P2 (1583-1546K), P3 (1546-1528K), P4 (1528-1483K), were detected by differential thermal analysis. Primary γ and eutectic γ-γ' were formed by the reactions, P1 and P2 respectively. The γ phase was formed by the P3 reaction, and the Zr rich and γ phases were formed by the P4 reaction.
(2) During sintering process, γ' and γ were formed by the 1st (1498-1523K) melting reaction. γ was formed by the 2nd (1523-1548K) melting reaction, and γ-γ'eutectic was formed by the 3rd (1548-l572K) melting reaction.
(3) Phases formed by the melting reactions, 2nd and 3rd, during sintering process corresponded to those formed by the reactions, P3 and P2 during equilibrium solidification, respectively.
(4) Phases formed by the 1st melting reaction during sintering process were different from those formed by the P4 reaction during equilibrium solidification, because IN-100 powder used in this study was prepared by rapid cooling.抄録全体を表示PDF形式でダウンロード (5169K) -
上原 重昭, 笹野 久興, 海江田 義也, 本間 一広, 鈴木 敏之1984 年 31 巻 4 号 p. 146-151
発行日: 1984/06/25
公開日: 2009/12/04
ジャーナル フリーIn order to make an equiatomic TiNi having the same density as that in the melting ingot by means of powder metallurgy, sintering characteristics of binary blended elemental compacts were investigated primarily and the sintering condition to obtain single phase of TiNi was determined. The density ratio of the TiNi obtained, however, was around 85%. In the next step, the effect of high pressure treatment in which from 203 to 810 MPa of hydrostatic pressure is applied at 1213K for 3.6ks on the density was examined.
Followings are the results obtained:
1) When the titanium powder of - 150 mesh size and carbonyl nickel powder ranging from 3 to 7μm were used as starting materials, single phase of TiNi can be obtained by the sintering in vacuum at 1273K for 36ks.
2) Density of the TiNi can be improved markedly by the high pressure treatment of over 203MPa of hydrostatic pressure and the density ratio reached almost 100%.
3) Diffusion rate between Ti and Ni particle in the blended elemental compacts under hydrostatic pressure was slower than that in vacuum.
4) The oxygen content of the TiNi sintered compact having 100% of density ratio was 0.27 wt% and the martensitic transformation started at 247K.抄録全体を表示PDF形式でダウンロード (6940K)
- |<
- <
- 1
- >
- >|