巻号一覧
54 巻, 10 号
October
選択された号の論文の10件中1～10を表示しています
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研究
研究
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岸本 幹雄, 臼杵 直樹, 坪井 聡子, 河野 研二, 西矢 芳昭, 楠本 正博2007 年 54 巻 10 号 p. 671-674
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスMagnetic beads were developed for the purpose of applying to biological use. The beads were composed of magnetite particles coated with amylose which showed the affinity bonding with maltose binding protein. The beads showed superior response to magnetic field based on the high magnetization and superior dispersability after the removal of magnetic field in the process of purifying a protein from biological samples. The beads showed five times greater efficiency in purification of protein than amylose resin beads currently on the market.抄録全体を表示PDF形式でダウンロード (633K) -
菊池 茂, 馬場 昇2007 年 54 巻 10 号 p. 675-681
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスCr-Cu sintered electric-contacts for vacuum insulated switch need to be separated easily when they were welded together by Joule heat, besides they need to have high electric-conduction and heavy-voltage insulation. Therefore, the Cr-Cu sintered materials for electric-contacts need to have a compatibility of high density and low strength. In this work, we designed a new alloy of which strength is reduced by an addition of low melting point metal and evaluated mechanical property.
20 mass% Cr-Cu alloys added with 0 to 1 mass% Te were prepared by sintering at 1333K in an inert atmosphere, and tensile strength of them were evaluated. Tensile strength decreased about 40% by addition of more than 0.05 mass% of Te. Gaps between Cr particles and Cu matrix were found in the fractured surface. The reduction in strength by addition of Te is considered to be caused by the gaps.抄録全体を表示PDF形式でダウンロード (1572K) -
飯泉 清賢, 澤田 豊, 岡田 繁, 宍戸 統悦, 工藤 邦男, 中嶋 一雄2007 年 54 巻 10 号 p. 682-685
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスSolid-state reaction between niobium (V) oxide and amorphous boron powders was carried out in a vacuum of 10−1 Pa at temperatures of 773K to 1773K for 1h. In the reaction at B/Nb2O5 molar ratios of 5.2 to 11.0 and 1773K, three kinds of niobium borides NbB, Nb3B4 and NbB2 were obtained. Single phases of NaB and NbB2 were obtained at the molar ratios of 5.7 and 8.2 to 10.6, respectively. However, when starting materials with the molar ratio of 7.0 were used, the Nb3B4 phase shows strongest relative X-ray intensities among NbB and NbB2 at 1773K. The lattice parameters of NbB and Nb3B4 are as follows: NbB (orthorhombic): a=0.3295 nm, b=0.8721 nm, c=0.3166 nm, Nb3B4 (orthorhombic): a=0.3302 nm, b=1.4076 nm, c=0.3142 nm. At the molar ratios of 8.2 to 10.6, lattice parameter of NbB2 (hexagonal) changed a=0.3111 nm∼0.3309 nm and c=0.3264 nm∼0.3308 nm.抄録全体を表示PDF形式でダウンロード (409K) -
山末 英嗣, 延原 功一, 邑瀬 邦明, 石原 慶一2007 年 54 巻 10 号 p. 686-693
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスThe ability of NO decomposition for titanium oxides, which crystal structure was changed by mechanical milling, has been measured. As mechanical milling methods, vibrational and planetary ball milling and mortar were employed. Using the ball millings and the mortar, the crystal structure was changed from anatase-type TiO2→TiO2II-type TiO2→rutile-type TiO2 and anatase→brookite-type TiO2→rutile, respectively. No impurity was detected after the milling by mortar, while the sample was unavoidably contaminated by the small amount of impurities after the ball milling. As for the NO decomposition, the order of the ability was anatase > brookite > TiO2II > rutile. It is found that NO2 production associated with NO decomposition was reduced when using brookite or rutile produced by mortar.抄録全体を表示PDF形式でダウンロード (999K) -
水内 潔, 井上 漢龍, 杉岡 正美, 伊丹 正郎, 尾崎 公洋, 浅沼 博, 川原 正和, 巻野 勇喜雄2007 年 54 巻 10 号 p. 694-698
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスBoron fiber reinforced Ti-15V-3Cr-3Al-3Sn alloy matrix composites were fabricated by a pulsed current hot pressing (PCHP) process at various processing conditions at a pressure of 32MPa in vacuum of 2Pa. Good bonding between the fiber and matrix was obtained by PCHP at 1123K for the holding time between 150s and 450s. When fabricated at the holding temperature at 1173K, the crystallization of boron in the vicinity of tungsten core in the fiber occurred. Tensile tests were carried out at room temperature for the composites fabricated by PCHP at 1123K for 300s. The yield stress of the composites containing 22.0 vol.% boron fiber attained at 1125MPa. This value was about 80% of the yield stress calculated by rule of mixture.抄録全体を表示PDF形式でダウンロード (1649K) -
横山 理英, 林 聡, 中西 真, 高田 潤2007 年 54 巻 10 号 p. 699-704
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスCarbonization of wood waste contributes to prevention of global warming through carbon fixation and the obtained charcoal can be effectively used for environmental purification. However it is not expected the charcoal obtained by mere carbonization has various uses. In this study, thermal decomposition of chips of Japanese cypress soaked in Ca solution and absorption properties of obtained charcoal for hydrogen chloride gas were investigated to develop a novel functional charcoal. Ca(OH)2 was used as Ca source due to less environmental load and easy handling. Ca-impregnated chips were heat-treated in an electric muffle furnace at temperatures between 600 and 900°C. The fine calcite crystals were dispersed homogeneously on the surface of tracheids in the heat-treated samples. The measurements of absorption properties for hydrogen chloride gas revealed that the absorptive ability and durability of these samples were higher than those of the conventional materials. From these results, it was suggested that an acidic gas absorption material with high reactivity could be prepared simply by the thermal decomposition of wood waste soaked in Ca solution.抄録全体を表示PDF形式でダウンロード (1356K)
特集：新しいコンセプトによる成形技術
総報
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清水 透2007 年 54 巻 10 号 p. 706
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスPDF形式でダウンロード (89K)
研究
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三浦 秀士, 永田 優, 石橋 秀基, 上村 誠, 大津 雅亮2007 年 54 巻 10 号 p. 707-712
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスTitanium and it's alloy have been widely used for medical and aerospace applications because of their excellent attributes of light material, high strength and high biocompatibility. However, it is not easy to produce the complicate shaped parts due to the poor castability and machinability. Selective laser sintering is hoped to be one of a useful processing route as direct and complicated shape forming for titanium powder.
This study has been investigated especially the improvement of the mechanical properties of laser sintered Ti compacts by changing the forming conditions such as laser power, frequency, scan speed, powder layer thickness, and atmosphere (vacuum degree). Eventually, laser sintered Ti compacts showed the tensile strength of 300 Mpa, the bending strength of 250 Mpa, and the young modulus of 11 Gpa which are similar to the properties of human bone.抄録全体を表示PDF形式でダウンロード (1153K) -
－高強度成形体が得られる泥漿の開発－鈴木 裕之, 松尾 亮平, 松崎 孝治2007 年 54 巻 10 号 p. 713-721
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスHigh-Speed Centrifugal Compaction Process (HCP) is a kind of wet compacting method for fine powders. One of possible applications of this technique is a net-shape fabrication of complex shape parts, especially including hollow shapes. For such application, we have developed HCP with cores but the compact was easily cracked and chipped because of insufficient green strength. Therefore, in this study we aimed to develop new slip system which enables to provide strong green compact. We revealed adequate combination and composition of dispersing medium, agent and binder resin for metallic powder slip. The HCP green compact of this slip system provides crack-and-chipping-free green compacts with cores, with packing density above 60%.抄録全体を表示PDF形式でダウンロード (1393K) -
川尻 秀和, 鵜島 裕介, 日比野 敦2007 年 54 巻 10 号 p. 722-729
発行日: 2007年
公開日: 2008/03/04
ジャーナル オープンアクセスIn recent years, the magnesium alloy is frequently used for automobile components, computer parts and digital camera parts. However, a lot of magnesium chips from the manufacturing process are dumped as the industrial waste, because the surface area per unit volume is wide and the magnesium machine chips are easy oxidized during the fusion process. However, the magnesium chips will be able to be recycled by the compaction forming to reduce the oxidation. In the paper, the compaction forming of the magnesium machine chips is attempted by the addition of asphalt. For the compact obtained, the check of crack, the strength test and the microstructure observation of the compact are performed. Furthermore, the fusion experiment of the formed compact into aluminum melt is examined to apply as the aluminum alloy additive.抄録全体を表示PDF形式でダウンロード (1281K)
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