巻号一覧
10 巻 (1963)
- 6 号 p. 231-
- 5 号 p. 184-
- 4 号 p. 138-
- 3 号 p. 83-
- 2 号 p. 44-
- 1 号 p. 3-
10 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
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原田 基一1963 年 10 巻 4 号 p. 138-143
発行日: 1963/08/25
公開日: 2009/12/04
ジャーナル フリーIn order to make fine Mo powder for metallising of ceramic electron tube, we prepared highly voluminous MoO 3 powder by means of oxidation followed by sublimation of Mo filament scrap and then reduced the sublimated MoO 3 to metallic Mo by hydrogen gas.
We found vertical type furnace was suitable for this purpous and the key point of operation was found to prevent the formation of the Mo lower oxide. A good result has been obtained by choosing the furnace temperature of 900-1200°C and treating capacities of 5kgMo/ hr at 1m3/min air draught ; 7kgMo/hr at 1.4m3/min were attained, and MoO 3 recovery was kept over 96%.
Sublimated MoO 3 had a purity of 99.9% up and mean particle size of 0.50μ. And the hydrogen-reduced Mo powder indicated its particle size at 0.55μ and proved good result for ceramic use.抄録全体を表示PDF形式でダウンロード (373K) -
木村 尚, 徳吉 睦生1963 年 10 巻 4 号 p. 144-152
発行日: 1963/08/25
公開日: 2009/05/22
ジャーナル フリーSlip Casting of Metal Powders. The slip casting of metal powders was investigated with atomized and electrolytic copper powders. The slip was prepared from the mixture of metal powders, defloculant (ammonium alginate) and water. The pH value of slip was controlled by adding concentrated sodium hydroxide. An optimum pH value range was 10-11. The apparent densities of slip cast specimens were 5g/cm3 in atomized copper powder and 2g/cm3 in electrolytic copper powder. The effect of particle size on sintering process of slip cast specimens was marked in both kinds of powder. The smaller the particle size, the better the sintering and the stronger the strength. The sintering rate of electrolytic copper powder was fater than that of atomized copper powder, but the apparent density and strength of sintered specimens of atomized copper powder were superior, since the initial density of the latter was larger than that of the former.抄録全体を表示PDF形式でダウンロード (3511K) -
田村 皖司, 武田 徹1963 年 10 巻 4 号 p. 153-159
発行日: 1963/08/25
公開日: 2009/05/22
ジャーナル フリーBecause of high surface tensional force of molten copper, air atomized copper powders show spherical shape, and such powders have poor pressing properties, exhibiting low green strength.
In the manufacture of porous bronze bearing, it is necessary to use copper powder of a substantially lower apparent density, with good properties for pressing and facility for producing compacts of high and controlled porosity.
In the present work, with the object of producing a copper powder having a low apparent density, effects of cooling capacity and the addition of small amounts of constituents to the melt on apparent densities of copper powders were examined.
The results are as follows;
1) The quenching action of the water from V-type auxiliary water jet, about 40l/min, was not sufficient to solidify the particle in the as-atomized shape.
2) The addition of small amounts of constituents which probablly form thin oxide films on the surface of the molten copper droplet was very effective to make copper powders having highly irregular particle shapes with apparent densities, 3.0 to 2.3g/cm3.
3) Their microscopic appearance was similar to that of the reduced powder.抄録全体を表示PDF形式でダウンロード (6239K) -
葉山 房夫, 鹿野 剛平1963 年 10 巻 4 号 p. 160-166
発行日: 1963/08/25
公開日: 2009/05/22
ジャーナル フリーFrictional characteristics of sintered Cu-C, Cu-Sn-C and Cu-Sn-C-SiO2 alloys used for lining of clutch and brake have been researched. Rusults are obtained as follows.
(1) As the porous sintered alloy has low modulus of elasticity, the surface contact is better than that of cast material. So it can be expected that the porous body has large coefficient of friction and good wear resistivity.
(2) Cu-C alloy needs to contain more than 2% of C for good wear resistivity, and Cu-Sn-C alloy needs to have more than 5% of C. And when the hardness of sintered material or mate steel is high, more carbon needs for good frictional characteristics.
(3) Cu-Sn-C alloy shows high friction compared with Cu-C alloy.
(4) When SiO2 is added for friction material, the coefficient of friction gets to the high stable value more rapidly, especially at high temperature.
(5) And the friction reaches to the high stable value more quickly at high percentage of SiO2, but in that case both sintered alloy and mate steel wear highly. So the reasonable content of SiO2 is less than 6%.抄録全体を表示PDF形式でダウンロード (464K) -
深津 保, 山家 菱1963 年 10 巻 4 号 p. 167-171
発行日: 1963/08/25
公開日: 2009/12/04
ジャーナル フリーFor the purpose of a study of sinfluences of Mo-addition on the structures and properties of TiC base cermet for cutting tool, sintering process of TiC-10% M-10% Mo specimen was investigated. During sintering under the condition of solid state sintering, Mo converts into Mo2C at the range of about 800-1000°C. The Mo2C diffuses in TiC and a new phase is formed on sorroundings of TiC particles. The new phase is intermediate in hardness of TiC and Ni phase, but it has the same crystal structure as TiC. This phase is, therefore, regarded as a solid solution of TiC and Mo2C. Development of this phase depends upon sintering condition, especially upon temperature and is remarkable for sintering above 1400°C. Sintered compact with such solid solution phase, however, is not desirable for cutting tool materials, because it is poor in wear-and chipping- resistance.抄録全体を表示PDF形式でダウンロード (1881K) -
木村 尚, 平林 平八郎, 徳吉 睦生1963 年 10 巻 4 号 p. 172-180
発行日: 1963/08/25
公開日: 2009/12/04
ジャーナル フリーA continuous method of producing iron strip from powder has been developed. Iron powder directly conversed to green strip by roll compacting, and which was continuously sintered, hot rolled and cooled in hydrogen atmosphere and coiled up. The effects of various continuous powder rolling factors, such as the sintering temperature, roll speed, and hot rolling lood on the properties of hot rolled strip were investigated with Husquvarna Star electrolytic iron powder and Höganäs sponge iron powder.
In general, with increasing the sintering temperature and hot rolling lood the physical and mechanical properties of iron strip by powder rolling were improved, whereas the effect of roll speed was different, depending upon the sinterability of iron powder. These properties obtained were considerably well for the powder metallurgical product, although the sintering time was short. According to the repeated hot rolling or annealing and cold rolling, the pro. perties of the iron strip were equal to those of the conventional iron strip, especially the one made from Husquvarna Star iron powder showed superior magnetic properties.抄録全体を表示PDF形式でダウンロード (1719K)
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