巻号一覧
21 巻 (1974 - 1975)
- 8 号 p. 213-
- 7 号 p. 183-
- 6 号 p. 153-
- 5 号 p. 127-
- 4 号 p. 91-
- 3 号 p. 66-
- 2 号 p. 38-
- 1 号 p. 1-
21 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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山口 修, 小倉 和庸, 清水 澄1974 年 21 巻 5 号 p. 127-131
発行日: 1974/09/25
公開日: 2009/12/04
ジャーナル フリーThe phase diagram of PbO (massicot)-PbTiO3 system in PbO rich region was determined by X-ray diffraction and DTA measurement. On the basis of this diagram, single crystals of perovakite-type PLTiO3 were grown from the melt with PbO as flux. And it was also studied by using a mixture of PbO-H3BO3-PbTiO3.
The following results were obtained.
(1) PbTiO3 single crystals were tetragonal having the stoichiometric composition and the direction of the growth was [100].
(2) The largest PbTiO3 single crystals (5mm×5mm×1mm) were obtained from the melt with the composition of PbO : PbTiO3=(80-70):(20-30) by mole percent.
(3) There was no difference in crystal size between the crystals obtained by the cooling rate of 25°C/hr and that of 50°C/hr from the melt at 1100°C.
(4) The translucent or partial translucent PbTiO3 single crystals were grown by adding 10 mole percent boric acid to the mixture of PbO:PbTiO3=(80-70):(20-30).
(5) In PLO-H3BO3-PbTiO3 system, the region of the composition for obtaining single crystals of PbTiO3 was 10≤PbTiO3≤35, 25≤PbO≤85 and 0≤H3BO3≤52 mole percent and the translucent or partial translucent single crystals were grown in the region of 10≤PbTiO3≤30, 25≤PbO≤45 and 44≤H3BO3≤52 mole percent.抄録全体を表示PDF形式でダウンロード (2744K) -
伊藤 俊治, 梶永 剛啓, 今井 郁子, 遠藤 一哉1974 年 21 巻 5 号 p. 132-139
発行日: 1974/09/25
公開日: 2009/05/22
ジャーナル フリーThe effects of chloric ion on the magnetic properties of isotropic strontium ferrite were studied. The hematite obtained from waste pickle liquor was used. It contained 0.1-0.3 wt% chloric ion as chloride.
Chloric ion in the hematite was reduced. to one half of the initial amount by washing with water. Though the green density remained unchanged after dechlorination, it was found that sintered density of ferrite obtained from the dechlorinated hematite was 5-10% higher than that of as received. Remanence and maximum energy product of the ferrite produced from the dechlorinated hematite were 10-15% higher and intrinsic coercive force was about 10% lower than those from non-dechlorinated ferrite.
In the case of the ferrites obtained from hematite contatining 0.2-5.0 wt% chloric ion as added in the form of ferrous chloride, magnetic properties of those having molar ratio of both 2 Fe/Sr=6.00 and 2 Cl/Sr=1.00 were improved 15-20% over those from not compensated ferrites. The maximum values of the magnetic properties were obtained in the range of 0.8-1.0 wt% chloric ion.
The chloric ion was found to exist as strontium chloride by X-ray diffraction. It was considered that the effects of chloric ion on the magnetic properties are due to the improved densification caused by liquid phase sintering of strontium chloride.抄録全体を表示PDF形式でダウンロード (4959K) -
鈴木 寿, 林 宏爾, 棚瀬 照義, 土屋 信次郎, 福家 康矩1974 年 21 巻 5 号 p. 140-143
発行日: 1974/09/25
公開日: 2009/12/04
ジャーナル フリーThe present authors previously reported that the high-strength WC-Co cemented carbide could be obtained by milling (WC+Co+Zn) powders and subsequently sintering the WC-Co-Zn mixture. In this report the effects of the amount of Zn mingled, sintering conditions and mean grain size of WC on the strength of Zn-added WC-10% Co medium-carbon alloys were first investigated. Secondly Second by the strengthening mechanism in the alloy was in detail studied in relation to the defects (such as pores, coarse WC grains and Co pools), which were observed on the ruptured surface as the origin of fracture.
Results obtained were as follows: (1) The strength was not sensitive to sintering conditions. (2) The effect of Zn addition decreased with increasing mean grain size of WC. (3) In Zn-added alloy with usual grain size of WC (1.5-1.8μ), the fracture rate starting from coarse WC grains (<-15 μ) increased, leading to the fact that the high strength of the alloy was caused by the decrease in density of large pores which are in general more responsible for the fracture than coarse WC grains.抄録全体を表示PDF形式でダウンロード (1531K) -
渡辺 〓尚, 奥住 文徳1974 年 21 巻 5 号 p. 144-150
発行日: 1974/09/25
公開日: 2009/05/22
ジャーナル フリーIn order to infiltrate lead base alloys into aluminum base sintered materials by the contact infiltration method, in which the infiltrants are contacted with skeletons, stable oxide films of alumina, which have little wettability to liquid metals on the internal surface of pores in the skeletons must be eliminated from the internal surface.
In this experiments, copper powder, which is useful to eliminate the alumina films from the internal surface of pores by the occurrence of liquid phase in the skeletons during the infiltrating process, was added 5% in weight to aluminum powder, as the raw material for making the skeletons. Moreover, tin was conbined from 0% to 50% by weight into the lead infiltrant in order to improve the wettability between the liquid infiltrants and the skeletons.
First, infiltrations into the skeleton were performed at 580°C for 30 min in pure hydrogen atmosphere having -40°C of dew point. Unfortunately, any infiltrants could not fully get into the skeletons.
Then, in the next, the infiltrations were performed again into the skeletons sintered under the eutectic temperature of 548°C in order to occur a large quantity of eutectic liquid of Al-33%Cu in the skeletons during the heating of infiltrating process, expecting the liquid infiltrants were drown into the pores by "prime effect" of the eutectic liquid. Consequently, satisfactory results were obtained, that is, infiltrating ratio was more than 90% when the infiltrant had a composition of Pb-50%Sn.抄録全体を表示PDF形式でダウンロード (3396K)
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