巻号一覧
24 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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土井 英和1977 年 24 巻 2 号 p. 33-42
発行日: 1977/03/05
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (2271K) -
徳永 文博, 陶山 容子, 加藤 昭夫1977 年 24 巻 2 号 p. 43-47
発行日: 1977/03/05
公開日: 2009/12/04
ジャーナル フリーFormation of Zn-ferrite powder by flame-spraying technique from the ethanol solution of Zn and Fe nitrates was investigated to elucidate the effects of reaction conditions on the properties of products. The reaction was carried out by spraying the solution into a reactor heated by an electric furnace.
The formation of Zn-ferrite by the present method took place to completion at reaction temperatures higher than about 800°C. Among the reaction conditions which affect the particle size of powder produced, the concentration of spraying solution is most important and one can obtain Zn-ferrite powder finer than 0.5μ by its control.抄録全体を表示PDF形式でダウンロード (1354K) -
原 善四郎, 明智 清明1977 年 24 巻 2 号 p. 48-54
発行日: 1977/03/05
公開日: 2009/12/04
ジャーナル フリーTi powder (Na reduced, -60 mesh, 0.09 wt% oxygen) was resistance-sintered in air. The dependence of mechanical properties and corrosion resistance' of compacts on the condition of resistance sintering, particle size and history of the powder was studied. The compacts having low oxygen content (0.13%) and excellent mechanical properties (98% theoretical density, tensile strength 40-50 kg/mm2, elongation 30%) were obtained. The oxygen content in products is affected by the history of the powder rather than by the conditions of resistance sintering. When fresh powder is used, with increasing of power input per unit time and particle size, the oxygen content in the products decreases, resulting in more ductile Ti metal. Corrosion resistance of the resistance-sintered Ti increases with the increase of their apparent density, and their corrosion level is almost the same as that of conventional P/M Ti.抄録全体を表示PDF形式でダウンロード (3460K) -
宮野 正晴, 星 靖, 上田 重朋1977 年 24 巻 2 号 p. 55-59
発行日: 1977/03/05
公開日: 2009/12/04
ジャーナル フリーA series of the studies on gas sulfiding for the various sintered steels have been made and some vital phenomena obtained are:
1) A suitable temperature range of the sulfiding is found to be between 300-450°C in the case of Fe-0.8%C alloys, and above this temperature, not only the quantity of iron-sulfide Fe1-xS formed in the pores begins to decrease, but also the films of iron-sulfide located on the surface of sintered steels have a tendency to peel off.
2) The quantity of iron-sulfide formed in the pores increases with lowering the density, but the sulfiding time has not large effect on the quantity.
3) The addition of copper to the sintered steels lowers each suitable temperature range of the sulfiding by 50-100°C and additionally, CuFeS2 films are observed besides the iron-sulfide Fe1-xS.
4) The depth of each sulfide layer formed in the pore of the sintered steels becomes small with decreasing H2S gas 'ratio, elevating the sulfiding temperature, increasing the density of the sintered steels and adding copper to the sintered steels.抄録全体を表示PDF形式でダウンロード (1655K) -
加藤 哲男, 河野 富夫, 久田 建男1977 年 24 巻 2 号 p. 60-65
発行日: 1977/03/05
公開日: 2009/12/04
ジャーナル フリーAs to 18%Cr, 18%Cr-1, 2%Mo, 23%Cr and 23%Cr-1%Mo stainless steel powders produced by the water-atomization, an investigation was made about the influence of Mo addition on the corrosion resistance of the sintered steels.
Results are summarized as follows.
(1) In the nitric acid, no influence of Mo addition is observed in 18%Cr and 23%Cr sintered steel.
(2) The influence of Mo on the sulfuric and hydrochloric acid corrosion is remarkable. When the sintered density is 6.5 g/cm3, the corrosion rate in 5% sulfuric acid of the sintered steels containing Mo decreases with the relation of 1/4Mo1.2+1 to that of the steels containing no Mo.
(3) If the sulfuric and hydrochloric corrosion rate of 18%Cr and 18%Cr-2%Mo sintered steels is compared with the annealed cast steel, logarithm of the corrosion rate of 18%Cr-2%Mo can be expressed as a linear equation of the sintered density, while in the case of 18%Cr the rate of fully dense sintered steel is bigger than that of annealed cast steel.
(4) In these corrosion, the dropping of powder particle from the surface of 18%Cr sintered steel is observed. But, this phenomenon is not observed in the 18%Cr-2%Mo sintered steel.抄録全体を表示PDF形式でダウンロード (2922K)
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