巻号一覧
39 巻, 2 号
選択された号の論文の18件中1～18を表示しています
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森 勇蔵, 井川 直哉, 八木 秀次, 井出 敞, 野路 進1992 年 39 巻 2 号 p. 75-78
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーRelationship between distribution of density of packed powder and green compact in two kinds of packing methods was studied. The shoe packing method and the mesh packing method were employed. The packed powders were compressed at 49 kN (7 MPa), 9.8 kN (14 MPa) and 49 kN (70 MPa).
It showed similar tendency between the packed powders and the green compacts in the density and its distribution: the green compacts, which were packed by the shoe packing method, were coarser and more widely distributed density than those of mesh packing method. It was found that the packing method affected the density and its distribution of the green compact, and also that the density distribution in the packing affected the friction between the particles and the die wall.抄録全体を表示PDF形式でダウンロード (263K) -
山口 一裕, 草野 圭弘, 福原 実, 土井 章, 高田 利夫1992 年 39 巻 2 号 p. 79-85
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーHidasuki is a characteristic red-colored pattern on the surface of Bizen-yaki. Before green weares are heated, straw ropes are used to prevent their mutual contact and it is only where the ropes are used that Hidasuki appears. Potassium and chlorine, detected in the straw, must be considered to play a significant role in Hidasuki coloration through their reaction with Bizen-clay. During the heating process of a mixture of Bizen-clay and 8wt% of KCI, hematite was formed at between 600°C and 1100°C. KCI reacted with water at the dehydroxylation temperature of halloysite to form HCI. Glassy phase containing potassium was formed at above 1100°C and hematite dissolved in the glassy phase. At 1300°C, only glassy phase containing iron ions and corundum were found. When the mixture of the glassy phase and corundum were cooled down slowly in air, hematite was found at below 1050°C. The degree of red coloring of the sample was closely correlated with the shape and the amount of hematite. Hematite with glassy phase was responsible for the red coloring of Hidasuki. However, hematite was not formed when the mixture was quenched. A similar mineral composition to that of Hidasuki was obtained when the mixtures 8 or l0wt% KCI added were cooled down at the rate of 0.2°C/min in air.抄録全体を表示PDF形式でダウンロード (3213K) -
下尾 聰夫, 筧 芳治, 陳 和民, 岡村 清人1992 年 39 巻 2 号 p. 86-91
発行日: 1992/02/15
公開日: 2009/12/04
ジャーナル フリーThe mechanism of pyrolysis of Si-Ti-C-O amorphous fiber (Tyranno) was studied. The pyrolytic rate was measured by means of a thermo-balance in Ar stream at temperatures from 1473K to 1673K. The pyrolysis products were examined by X-ray diffraction and SEM observation.
The pyrolytic rate was strongly dependent on temperature, and the amorphous fiber crystallized to β-SiC and TiC during the pyrolysis. The pyrolysis rate was determined by the crystal growth controlled by the diffusion of carbon in the fiber and described by an Avrami-Erofeev equation. Tyranno fiber decomposed more rapidly than Ti free Nicalon fiber.抄録全体を表示PDF形式でダウンロード (2196K) -
四方 良一, 山本 泰次, 塩野 剛司, 西川 友三1992 年 39 巻 2 号 p. 92-97
発行日: 1992/02/15
公開日: 2009/12/04
ジャーナル フリーZrO2-Al2O3 composites with the bending strength of 3000MPa were developed. To discuss the mechanism which gives such a high bending strength, microstractures and atomic diffusions of incoherent ZrO2-Al2O3 interfaces in the composite of ZrO2-2 mol% Y2O3 with Al2O3 addition of 20 wt% were investigated using high resolution analytical electron microscopy. The results obtained are summarized as follows.
(1) In the composite Al2O3 grains were dispersed uniformly in ZrO2 matrix and no crack and no flaw were observed.
(2) In many ZrO2 grains dislocations were brought about by tensile stress in ZrO2 grains generated by the thermal expansion mismatch between ZrO2 and Al2O3. They contributed to the division of tetragonal ZrO2 grain and the relaxation of residual tensile stress in ZrO2 grain.
(3) ZrO2 and Al2O3 grains formed direct interfaces without any reacting phases.
(4) At ZrO2-Al2O3 grain interfaces, the diffusions of Zr and Al to Al2O3 and ZrO2 grains were observed respectively. It was considered that these chemical effects strengthened ZrO2-Al2O3 grain interfaces.抄録全体を表示PDF形式でダウンロード (5390K) -
土屋 信次郎, 福田 雅秀, 池 浩之, 鈴木 壽1992 年 39 巻 2 号 p. 98-102
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーThe structural changes of sintered WC-(10-20)mass%Co and WC compacts along the machining surface obtained by electric discharge machining using fine wire were studied. The three sorts of carbides, W2C, β-WC1-x (B1 type) and WC, were generally detected along the surface, with no cobalt and η phases in both compacts. The appearance of different phases of W2C and β-WC1-x was assumed to result in the fact that the high temperature phase (β-WC1-x ) crystallized in non-equilibrium state in the course of rapid cooling of molten WC produced during electric discharge machining, and that the eutectoid reaction of β-WC1-x into W2C Plus WC took place incompletely. Some microstructural changes due to the machining were examined.抄録全体を表示PDF形式でダウンロード (3634K) -
宮本 大樹1992 年 39 巻 2 号 p. 104
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (72K) -
伊藤 太一郎, 藤村 紀文, 柿木 正美1992 年 39 巻 2 号 p. 105-108
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーTo investigate the effect of interfacial energy on the epitaxial growth of LiNbO3, liNbO3, was deposited on the (001) α-Al2O3 by a rf magnetron sputtering using pressed powder targets to decrease the deposition rate. Below the substrate temperature of 650°C, only the LiNb3O8 (-602) layer grew epitaxially at the same deposition conditions as the LiNbO3 (012) growing epitaxially on the α-Al2O3 (012) single crystal substrate. The reason is that the interfacial energy at the LiNb3O9, (-602)/ α-Al2O3 (001) interface is smaller than that at the LiNbO3 (001) / α-Al2O3 (001) interface. Therefore, even under the conditions to deposit films with the higher Li concentration by increasing the Li/Nb ratio in the targets, the LiNbO3 layer did not grow, but the LiNb3O8 (-602) epitaxial layer grew. However, above the substrate temperature of 700°C, a mixtured layer of LiNbO3 and LiNb3O8 grew. By using the target with the highest Li/ Nb ratio (3/1), the epitaxial layer of LiNbO3(001) grew, though contained the thin mixtured layer of LiNbO3 and LilNb3O8 polycrystallines at the surface. The polycrystalline layer transformed to the epitaxial LiNbO3 layer by annealing at 800°C in the oxygen gas atmosphere.抄録全体を表示PDF形式でダウンロード (1370K) -
増本 博, 後藤 孝, 増田 陽一郎, 馬場 明, 平井 敏雄1992 年 39 巻 2 号 p. 109-112
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーBi-Ti-O oxide thin films were prepared on a sapphire single crystal substrate by electron cyclotron resonance (ECR) plasma sputtering. The target used was a sintered Bi4Ti3O12(BIT). The temperature of substrate (Tsub) was controlled in the range from room temperature to 640°C. The film obtained at Tsub=500°C was mixture of pyrochlore type oxide(Bi2Ti2O7) and Bi4Ti3O12 oxide. In the film formed at 640°C, the (001) plane of the Bi4Ti3O12 grew parallel to the (1120) and (1102) planes of the sapphire substrate, and the (104) plane of Bi4Ti3O12 grew parallel to the (0001) plane of the sapphire substrate. The deposition rate was about 200Å/min. Transmittance and refractive index of the Films were measured.抄録全体を表示PDF形式でダウンロード (1390K) -
真岩 宏司, 一ノ瀬 昇, 岡崎 清1992 年 39 巻 2 号 p. 113-118
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーPb-O, La-O, Zr-O, Ti-O thin films were prepared by reactive rf-magnetron sputtering of metallic Pb, La, Zr and Ti target in an atmosphere of mixed gas of argon and oxygen. The deposition rate, crystal structure and optical properties of sputtered films were studied as a function of the partial pressure of oxygen (Po2). Total pressure was controlled to maintain a constant value of I Pa. The deposition rate of the films decreased remarkably when the partial pressure of oxygen exceeded a certain value. Generally, with the increase of the input power, the critical Po2 shifted to high pressure side. When films were deposited in higher Po2 than the critical, oxide thin films were prepared. From the measurement of optical emission spectra during sputtering, the formation of oxide on the surface of target was confirmed, resulting in the decrease of the deposition rate.抄録全体を表示PDF形式でダウンロード (284K) -
上條 栄治, 鈴木 隆夫, 小泉 光恵1992 年 39 巻 2 号 p. 119-121
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーDual ion beam sputtering technique for deposition of AIN thin films is described. The metal atom flux was supplied on substrate by sputtering an Al target with an Ar ion beam, while the reactive N2 flux was supplied directly on the growing film surface as a nitrogen ion beam. In this experiment, it is clear that the AIN thin films with high optical transparency(>95%) in the wide wavelength regions, high refractive index(>2.3) and (110) plane preferential orientation are obtained on substrate at 25°C by the control of nitrogen ion beam energy irradiating to the growing film surface.抄録全体を表示PDF形式でダウンロード (177K) -
陳 先同, 山根 久典, 嘉屋 樹佳, 平井 敏雄1992 年 39 巻 2 号 p. 122-125
発行日: 1992/02/15
公開日: 2009/12/04
ジャーナル フリーRutile films were prepared on sapphire (1102) substrates by chemical vapor deposition using titanium tetraisopropoxide {Ti[OCH(CH3)2]4} as a precursor. The Elms showed preferred orientation of (101) parallel to the substrate plane. The epitaxial relationship between the film and the substrate was found by X-ray pole figure analysis. Refractive index nealy equal to that of the single crystal of rutile was measrued for the epitaxial film prepared at 800°C.抄録全体を表示PDF形式でダウンロード (222K) -
坂東 尚周1992 年 39 巻 2 号 p. 128
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (40K) -
牧野 彰宏, 山本 豊, 坂詰 直樹1992 年 39 巻 2 号 p. 129-133
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーThe Mn-Zn ferrite bodies with densities above 99.8% and fine grain sizes blow 5μm were obtained by sintering spinel ferrite powders prepared by hydrothermal method at relatively lower sintering temperature than that in the ordinary sintering process. The Mn-Zn ferrite bodies with grain sizes below 3μm have higher bending strength than the commercial Mn-Zn ferrite with grain sizes around 9 μm now used as present as a magnetic head material and relative permeabilities comparable to that of the commercial ones at a frequency range above 2 MHz. Therefore, the Mn-Zn ferrite with a high density and fine grain sizes is expected to be useful as the magnetic head for high density recording.抄録全体を表示PDF形式でダウンロード (2620K) -
水嶋 隆夫, 牧野 彰宏, 金子 双男, 小林 敏志1992 年 39 巻 2 号 p. 134-138
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーWe found out that the addition of various rare earth metal oxides (Ce2O3, Pr2O3, Eu2O3, Dy2O3, Ho2O3, Er2O3, Yb2O3) have improved both the saturation magnetization(σs) and the relative perme-ability(μr') of Mn-Zn ferrite single crystals. Fspecialy, the σs shows the maximum value of 10.56×10-3Wbkg-1 when 0.05mol% Er2O3 is added to Mn0.54Zn0.35Fe2.10O4.It is considered that the effect of the Er2O3 addition on magnetic properties is closely related to the dissolution of Er into the Mn-Zn ferrite. The Mn-Zn ferrite containing Er2O3 is expected to be used as magnetic head materials.抄録全体を表示PDF形式でダウンロード (1626K) -
藤田 実, 平塚 信之, 柿崎 浩一1992 年 39 巻 2 号 p. 139-142
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーAcicular BaCoxTixFe12-2xO19 (X=O-1.0) particles and their coated films were prepared. The homogeneous mixtures of α-FeOOH, Ba(OH)2, Co acetylacetonate and Ti acetylacetonate were sintered at 900°C for 3 hrs and then quenched.
The aspect ratio of about 10-15 didn't depend on the amount of the substitution, X. The corecive force linearly decreased with the increase of X. As the sample of X=0.7 had the coercive force of about 1 KOe, it is available for the present magnetic recording medium. The magnetization of these samples was unchanged with X until X=0.7.
The mixture of the acicular particles of X=0.7, dispersing agent and binder resins was coated on the polyestel film in the magnetic field of 7 Be perpendicular to the film. It was confirmed that the long axis of the acicular particles was parallel to the base film by the TEN observation of the cross-section of the coated film. The magnetic anisotropy of acicular BaCoxTixFe12-2xO19 film is in the direction perpendicular to the film. The acicular hexagonal ferrite particles is applicable to a perpendicular magnetic recording medium.抄録全体を表示PDF形式でダウンロード (2263K) -
藤井 達生, 高田 潤, 三浦 嘉也, 高野 幹夫, 坂東 尚周1992 年 39 巻 2 号 p. 143-146
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーStoichiometric Fe3O4 films have been epitaxially formed on both α-Al2O3 and MgO single-crystalline substrates by a reactive vapor deposition method. A few-Å-thick probe layer containing 57Fe was formed at a desired depth of an inactive 56Fe3O4 matrix film to apply a depth selective Mössbauer spectroscopy. Even at the topmost layer and also at the interface, the electronic state retained the essential features of Fe3O4 bulk so that the Verwey transition was clearly detected. Any minor depth-dependent changes in electronic state were confined in a few outermost atomic layers. The nature of the changes depended on the orientation of the films and the lattice mismatch between the substrate and the film.抄録全体を表示PDF形式でダウンロード (301K) -
水嶋 隆夫, 牧野 彰宏, 金子 双男, 小林 敏志1992 年 39 巻 2 号 p. 147-151
発行日: 1992/02/15
公開日: 2009/12/04
ジャーナル フリーThe effects of Er2O3 adition on magnetic properties of Mn0.61Zn0.32Fe2.07O4 poly crystals made by sintering the powders prepared by a hydrothermal process were studied.
When Er2O3 is added in the composition range of 0.01-0.1 mol% to the MnZn ferrite, the relative permeability(μr') at frequency range below 1MHz and the coercive force(Hc) are improved by Er2O3 addition. Sturation magnetic flux densities(Bs) are increased with increasing Er2O3 content below 0.05mol% and then decreased with further increasing of Er2O3 content.
The effects of Er2O3 addition are closely related to the dissolution of Er into the Mn-Zn ferrite. The Mn-7n ferrite containing Er2O3 is expected to be useful as the magnetic head material for high density recording.抄録全体を表示PDF形式でダウンロード (1410K) -
平塚 信之, 清水 理夫, 藤田 実, 杉本 光男1992 年 39 巻 2 号 p. 152-155
発行日: 1992/02/15
公開日: 2009/05/22
ジャーナル フリーNi1-xZnxFe2O4 ( X=0-1.0 ) films were prepared by a reaction deposition method with an r.f. generator of 13.56 MHz. We adopted the accumulation method that a small amount of mixture of Ni, Zn and Fe metals was evaporated several times in order to uniform the compositional distribution in a film. When as-deposited films were annealed at 900°C for 6 hours in air, spinel-type ferrites were completely formed. It was suggested by measurements of lattice constants and Curie temperatures that the composition of the film annealed at 900°C were nearly equal to those of starting materials. The Ni0.4Zn0.6Fe2O4 (X=0.6) film had a saturation magnetization of 400 emu/cc and a coercive force of 30 Oe. The limit frequency of initial permeability of the films in the composition range between X= 0.2 and 0.6 was slightly higher than that of the bulk ferrites.抄録全体を表示PDF形式でダウンロード (229K)
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