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Volume 10 (1963)
- Issue 6 Pages 231-
- Issue 5 Pages 184-
- Issue 4 Pages 138-
- Issue 3 Pages 83-
- Issue 2 Pages 44-
- Issue 1 Pages 3-
Volume 10, Issue 5
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1963 Volume 10 Issue 5 Pages 184-188
Published: October 25, 1963
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (412K) -
On the Mechanical Properties of Sintered W-Ni-Fe AlloysHisasuke Takeuchi, Tatsuo Abe1963 Volume 10 Issue 5 Pages 189-197
Published: October 25, 1963
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSIn this paper, a study has been made of the phenomena which occur when W-Ni-Fe powder compacts containing W from 90 to 97% are sintered at various temperatures. Besides of density, electrical conductivity and hardness, the tensile properties were determined as a measure of workability for each alloy composition. Several results were obtained as follows.
(1) When the composition is selected in such a way that Ni/Fe ratio is equal to 1, the alloy has the highest ductility.
(2) The tensile properties of each W-Ni-Fe alloy depends greatly on the properties and structure of its own Ni-Fe matrix.
(3) The cooling rate after sintering affects considerably on ductility of W-Ni-Fe alloys.
By fast cooling, they become more ductile.
These results were studied, in more detail, with the aids of X-ray and magnetic analysis, and microhardness measurement. On the basis of these data, several W-Ni-Fe alloys could be cold-rolled.View full abstractDownload PDF (5875K) -
Tsuyoshi Amanuma, Kazuo Sakamoto1963 Volume 10 Issue 5 Pages 198-203
Published: October 25, 1963
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSSamples used in this experiment are as follows.
(1) UO2 powder : Ceramic grade UO2 powder produced by Degussa Works. (o/u-2.08)
(2) Massive UO2: Eleetrodeposited UO2. (o/u-2.005)
(3) Massive UO2: Fused UO2 produced by Spencer Works. (o/u-2.00 3)
(4) Massive U4O9 : Electrodeposited U4O9_X (o/u-2.10)
(All massive samples were crushed -325 mesh and tested)
The difference of oxidation behavior of each sample was detected by X-ray analysis, in-frared spectrophotometry, D.T.A. and microstructure.
Main results obtained were as follows.
1) The relationship between heating temperature and o/u ratio of samples were shown in Fig.3. The results of X-ray analysis and infrared spectrophotometry of these heated samples were summarized in Table 2. The DTA curves of these samples ware shown in Fig.1. From these results, it seemed that the oxidation behavior of these samples were same substantially, namely, UO2 (cubic) or U4O9_X (cubic) 200-400°C U3O7 (tetragonal) 340-425°C U3O8 (orthorhombic), and the difference of the crystal transformation temperature of individual sample might be introduced from its particle size and surface activity.
2) From the results of infrared spectrophotometry, we could recognize a small absorption at about 15.3μ of infrared ray, and it might be caused by the existence of U3O7 phase.
3) As shown in Photo. 2, the shape of electrodeposited U4O9_X single crystal was lozenge and very thin, and completely differ from the shape of octahedron of electrodeposited UO2. But this apparent difference of both crystals are not so substantial. The regular triangular etch pits on the lozenge face of U4O9_X crystal showed that this face is identical with (111) face of UO2 crystal.View full abstractDownload PDF (1609K) -
Kôshi Toita, Shuji Aono, Hiroshi Kobayashi1963 Volume 10 Issue 5 Pages 204-208
Published: October 25, 1963
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSIn order to study the background of the quality control which affects the quality rate of Mn-Zn ferrite, tests have been made on the mechanism of deformation and the dimensions of core, related to the linear shrinkage during sintering.
It has been shown that in compacting and cutting process, the core dimensions may be determined with a view of expansion after compacting, and compacting techniques affect the deformation seriously, but the rate of elevating furnace temperature has no influence on the deformation of product.
And it has been suggested that the dewax mechanism has relation to the deformation of product.
The linear shrinkage of Mn-Zn ferrite is depend on recrystallization or crystal growth rather than the reaction of the spinel formation during its sintering.View full abstractDownload PDF (352K) -
Isao Tanabe, Koichi Oku, Susumu Uotani1963 Volume 10 Issue 5 Pages 209-214
Published: October 25, 1963
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSLow carbon ferrochrome ingot contaning about 45% Cr was reduced to powder by means of σ phase brittleness brought about as a result of heat treatment at about 800°C.
Whether the application for powder metallurgy of the ferrochrome powder was proper or not was examined.
1) Powder ferrochrome crushed by means of σ phase brittleness is dense and square shaped with property to be easily made fine powder.
2) Green strength of compact, while it is reduced in proportion to increase of ferrochrome powders content, shows a certain degree of intensity that makes possible of using them, even in case of containing 25% of chrome in the event of compact pressure at 5ton/cm2.
3) In case of containing 13%, 18%, and 25% of chrome, compacts at 3 to 5ton/cm2 of compacting pressure are sufficiently diffused by sintering at 1300°C for about 3 hours.
4) Tensile strength of compacts in case of 3) shows 27-28kg/mm2, and 28-30kg/mm2 where was heat treated.View full abstractDownload PDF (3350K) -
Kazuyoshi Kobayashi, Eizaburo Kuzuhara, Motoi Oda1963 Volume 10 Issue 5 Pages 215-220
Published: October 25, 1963
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSThe importance of iron oxide has to be emphasized greatly as the materials of ferrites. There are many ways of manufacturing process in making iron oxide.
This study is mainly aimed at solid reaction of ferrites which are made from various kinds of iron oxide processed from different manufacturing procedures.
The results showed that wet method, especially in goethite, is faster in solid reaction than dry method which is usually employed. This is caused by the particle size as well as diffusibility. We believe that iron oxide processed by wet method or day method will differ a great deal in magnetic characters.View full abstractDownload PDF (1508K) -
Kunio Shida1963 Volume 10 Issue 5 Pages 221-225
Published: October 25, 1963
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSSpeci-mens of Fe, Fe-6%Al, and Alnico system (including 9%Al, 14%Ni, 24%Co, 3ooCu and balance Fe) powdered compact of 10mm∅ × l0mm size compressed by 3t/cm2 and polished lightly but not etched were studied under a high-temperature microscope, to examine continuously the change in structure under elevated temperature in vacuo from room temperature up to 1200°C. The results obtained were as follows: The change in microstructure of Fe, Fe-6%/Al and Alnico system powdered compacts under elevated temperature are illustrated in Fig. 2, Fig. 3 and Fig. 4, respectively. The specimen consisting of only Fe powder showed steady change, while in the case of specimens containing Fe-50%Al alloy powder, as progressively higher temperatures were employed, the grains of Fe-50%Al alloy were broken-down to fine particles. This break-down behaviour began at Ca. 700°C and then continued until almost 1190°C, which is the melting point of Fe-50%Al alloy. Changes in dimensions of specimens under elevated temperature corresponded with their changes in microstructures.View full abstractDownload PDF (5364K)
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