巻号一覧
33 巻, 4 号
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黄木 正美1986 年 33 巻 4 号 p. 175-181
発行日: 1986/06/25
公開日: 2009/05/22
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横田 勝, 庄司 啓一郎, 三浦 春松, 伊佐 重輝1986 年 33 巻 4 号 p. 182-186
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーFlame spraying gun was applied to the production of pure Al and AI-5.4%Si alloy powders. For the purpose of obtaining rapidly cooled powders the metallic sprays were injected into static water in stainless steel vessel, dynamical water and dynamical liquid nitrogen in rotary copper drum, respectively.
Some characteristics of the powders obtained were estimated with reference to the particle size distribution, particle shape, degree of oxidation and cooling rate of powders.
The shape of the powders obtained from this experiment was similar to that of commercial water atomized Al powder. The cooling rate of Al-5.4%Si powder estimated from the dendrite arm spacing was about 104 K/s, and the solubility of Si in Al powder measured at room temperature was about 3 wt% which was approximately twice as much as that of equilibrium state at the eutectic temperature of 830 K.抄録全体を表示PDF形式でダウンロード (3484K) -
1986 年 33 巻 4 号 p. 186
発行日: 1986年
公開日: 2009/05/22
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黒木 英憲1986 年 33 巻 4 号 p. 187-192
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーCubic compacts, 10 mm in size, were formed from an electrolytic powder with a die-wall lubricant alone, or with 0.7 wt% of Ca, Fe or Zn stearate to change the swelling during the de-waxing operation. Some compacts were compressed slightly in a lateral direction after the ejection from the die to simulate the spring-back. The dimensions of the compacts were measured with a micrometer i) during the production process, ii) during the pressing operation at 588 MPa, iii) after ejecting, iv) after de-waxing at 600°C (873 K) for 30 min and v) after sintering at 1100°C (1373 K) for 60 min in dissociated NH3.
The compressed compacts containing Zn stearate showed residual expansions in two other directions, larger in the compacting direction and less in the non-compressed lateral direction. The compacts with Ca stearate swelled remarkably while dewaxing, especially in the compacting direction, while other lubricants caused some shrinkage. All compacts except those containing Ca stearate which shrank while holding at 1100°C (1373 K) shrank mostly during the heating operation in the upper α temperature range.
A good proportionality was found between the expansion from the minimal dimension to the maximal dimension before sintering and the shrinkage from the maximal dimension to the dimension of the sintered compact regardless of the direction.抄録全体を表示PDF形式でダウンロード (428K) -
滝川 博, 河合 伸泰, 岩井 健治1986 年 33 巻 4 号 p. 193-198
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーAtomized powders of MERL76 superalloy were rolled at room temperature and their recrystallization behaviour in the atomized and rolled powders was examined at various temperatures. Further, the superplastic behavior of IN100 superalloy powder compact, consolidated by hot isostatic pressing was examined at 1050°C and in the range of strain rates from 4×10-5 sec-1 to 8×10-3 sec-1. The recrystallized grain size of rolled powder particle was finer than that of the atomized powders. Fine grained materials of full density were obtained at the HIP conditions of 1100°C, 90 MPa and 1 hr using both atomized and rolled IN100 powders. These HIP'ed materials showed a superplasticity and the maximum elongation of these from the rolled powder compact was 110%. This value was slightly lower than that of the materials made from the fine powder compact. The cold rolling was effective for grain refining of coarse powders, but it should be operated in a protective atmosphere to prevent the occurrence of PPB (Prior Particle Boundary).抄録全体を表示PDF形式でダウンロード (5303K) -
鈴木 寿, 松原 秀彰1986 年 33 巻 4 号 p. 199-203
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーSuch properties as microstructure, transverse-rupture strength, thermal conductivity, thermal expansion coefficient etc. of sintered TiC0.7-N0.3- and TiC0.5N0, 5-WC-16.4 vol%Ni alloys (called 7/3 and 5/5 alloys, respectively) were studied as a function of WC content. It was confirmed that WC phase can be retained in the structures as a nonequilibrium state when the WC content increases more than about 22 and 10 vol% in the 7/3 and 5/5 alloys, respectively. It was noted that the alloy, in particular, the 5/5 alloy having WC phase in nonequilibrium state shows a high thermal conductivity accompanied by a low thermal expansion coefficient, as well as the excellent mechanical properties.抄録全体を表示PDF形式でダウンロード (3120K) -
Ali Haerian, Susumu Shima1986 年 33 巻 4 号 p. 204-209
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーEDM technique proves to be a suitable method for precracking of WC-Co fracture toughness specimens. The notch may be produced by either a wedge-ended plate or a wire. KIC for these specimens with the notch root radii around 200μm are consitent (one standard deviation about 5% of the mean), and about 8 to 14% higher than those obtained using other precracking methods. No significant difference was observed between KIC values for surface ground samples and those tested in as sintered condition.抄録全体を表示PDF形式でダウンロード (1264K) -
林 宏爾, 小坂井 守1986 年 33 巻 4 号 p. 210-215
発行日: 1986/06/25
公開日: 2009/12/04
ジャーナル フリーThe microstructure and room temperature transverse-rupture strength of Si3N4-Y2O3-Al2O3 compacts sintered under 0.1 MPa of nitrogen were mainly investigated as a function of contents of Y2O3 (2-20 mol%) and Al2O3 (6-17 mol%).
Two kinds of crystalline grain boundary phases (YSiO2N and Si3N4⋅Y2O3) were formed, according to the contents of Y2O3 and Al2O3. The compact showed the highest strength (1.0 GPa) nearly at the composi-tion of 8 mol%Y2O3 and 6 mol%Al2O3. This would mainly be attributed to the facts that the compact had high relative density and that it was almost free from both large pores acting as a fracture source and a large domains of Si2N4⋅Y2O3 phase.抄録全体を表示PDF形式でダウンロード (4450K) -
各種フェライトにおける発生およびその粒成長伊藤 滋, 大場 健史, 米田 登1986 年 33 巻 4 号 p. 216-220
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーSome small fraction of large grains was observed in the microstructure of sintered ZnFe2O4, MnZnFe2O4, Fe3O4 (in N2) and MnFe2O4 (in air). This structure is sometimes called "duplex structure". As the sintering proceeded, the number of large grains increased to form the continuous structure of large grains, while the size of large grains did not increase remarkably. On the other hand, the duplex structure was not observed in the ferrites with the composition of NiFe2O4 and CoFe2O4, independent of prefiring and sintering conditions. However, when amounts of Fe2O3 were excess in the composition of the ferrites, duplex-like structures were observed. This structure was also formed in the CoFe2O4 containing platinum powder (Pt black) known as a redox catalyst. From these results, the duplex structures seem to be formed in such ferrites that are easy to vary their compositions or valencies at high temperatures. In addition, the growth of small grains was very slow during the formation of duplex structure. It was considered that the exaggerate grain growth was generated by the local activation of the stabilized grain boundaries, which was caused by the variation of compositions or valencies during the sintering.抄録全体を表示PDF形式でダウンロード (3961K) -
浅井 彪, 河合 七雄1986 年 33 巻 4 号 p. 221-223
発行日: 1986/06/25
公開日: 2009/05/22
ジャーナル フリーHydrogen bronzes, HxV2O5, HxNb2O5, HxMoO3 and HxWO3, were synthesized by irradiating respective oxide powders, either with or without loading of Pt, suspended in 1 : 1 aqueous ethanol solution. All products had a different colour from the parent oxides, which fades out in a moist air. Photoacoustic spectra showed a broad and structureless absorption over the visible region. This method gives bronzes with a small x value (x ?? 0.02) except for H0.32V205 and having the same X-ray diffraction pattern as that of the parent oxide.抄録全体を表示PDF形式でダウンロード (196K)
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