巻号一覧
57 巻, 2 号
February
選択された号の論文の12件中1～12を表示しています
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研究
研究
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吉田 浩之, 魯 云, 廣橋 光治2010 年 57 巻 2 号 p. 69-75
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスTi/TiO2 and Cu/TiO2 composite photocatalysts were fabricated by spark plasma sintering (SPS) technique. TiO2 powder (ST-01, Ishihara Sangyo Kaisha, LTD.) with an average diameter of 7 nm was used as the matrix material. Ti powder with 99.8 % purity and an average diameter of 35 μm and Cu powder with 99.9 % purity and an average diameter of 30 μm were used as the addition metals, respectively. The sintering was carried out at 973 K for 3 min with a heating rate of 100 K/min under a uniaxial pressure of 30 MPa. The microstructure and crystal form of the composite photocatalysts were examined by SEM and XRD. The photocatalytic activity of the composite photocatalysts was evaluated by measuring the decomposition rate of methylene blue (MB) solution at room temperature. The results show that TiO2 photocatalyst fabricated at 973 K had the high activity, and that anatase crystal form was kept for the composite photocatalyst with 0∼5 wt%Ti, but the composite photocatalysts with 10 wt%Ti had two crystal forms, anatase and rutile. Antase crystal form was kept for all Cu/TiO2 composite photocatalyst. High photocatalytic activity was obtained because of the composite effect. Photocatalytic activity goes up with addition amount of Ti or Cu powder and reached the maximum about 1 vol%, then goes down.抄録全体を表示PDF形式でダウンロード (2062K) -
片元 勉, 橋本 英樹, 藤井 達生, 高田 潤2010 年 57 巻 2 号 p. 76-83
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスA new layered iron hydroxide was synthesized by a wet chemical technique, by which aqueous ferrous sulfate solution was gradually oxidized by using sodium carbonate at 283∼333 K. Obtained yellowish precipitates identified by X-ray powder diffraction had a similar structure to the layered double hydroxides. The observed interlayer spacing was about d=0.74 nm. Electron micrographs showed that the particle had plate-like morphology. Electron diffraction pattern of the plate-like particles had hexagonal symmetry, when the electron beam was aligned normal to the planes. Mössbauer spectrum suggested that all iron ions were paramagnetic Fe3+ states with large quadrupole splittings at room temperature. These results show that the obtained new layered iron hydroxide cotains only Fe(III) ion species. Water vapor adsorption curves of the sample oxidized at 291 K showed high adsorption value (19 wt%) by unit weight.抄録全体を表示PDF形式でダウンロード (1819K)
特集：環境・エネルギー・資源問題解決に貢献する粉体機能
総報
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仙名 保2010 年 57 巻 2 号 p. 86
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスPDF形式でダウンロード (146K)
受賞記念講演
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原田 幸明2010 年 57 巻 2 号 p. 87-95
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスContributions of the technology of engineering materials especially powdermetallurgy are reviewed. A historical consideration from the proposal of ecomaterial suggests the rapid change of requirements for materials from the viewpoint of global environmental issue from both sides of quality and quantity, namely "consideration" at the early stage, running through "effect", and "achievement" at the current stage. Six items for environment are "greener resource", "greener production", "higher material efficiency", "environment remediation properties", "hazardous substance free" and "higher recyclability". Especially the role of "higher material efficiency" is magnifying to achieve the goal of the reduction of green house gas of Cool Earth 50. The technologies of fabrication and processing will contribute in wide area of the development of new green energy technology. On the other hand, the development of new green energy materials arise the considerable growth of demand of rare metals. The improvement of resource productivity is necessary to avoid the resource risk. Powdermetallury has the wide application possibility to improve the resource productivity of engineering materials.抄録全体を表示PDF形式でダウンロード (3021K)
研究
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Kalathur S. Narasimhan, Bruce Lindsley, Peter Sokolowski, Tony Nishida2010 年 57 巻 2 号 p. 96-105
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスFluctuating raw material prices requires a judicious selection of materials and processing to optimize economic benefits in making powder metallurgical parts. Molybdenum is a powerful alloying element in powder metallurgy. 0.85 % and 1.5 % Molybdenum prealloyed powder has been used successfully for number of higher performance applications where hardenability is an important factor. A 0.3 % Mo prealloyed powder introduced recently offers even better choice when part sizes used in PM industry is considered. For example 0.3 % Mo prealloyed powder (Ancorsteel 30HP) in heat-treated condition can match the performance of 0.85 % Mo prealloyed (Ancorsteel 85HP) powder.
For a higher hardenability requirements a prealloyed material Fe-0.9Mo-0.5Ni-0.4Mn developed offer good opportunity to develop correct microstructure for the desired application. This material can be used in sinterhardened or heat-treated applications.抄録全体を表示PDF形式でダウンロード (1958K) -
松岡 翔, 加藤 将樹, 廣田 健, 塚越 一彦2010 年 57 巻 2 号 p. 106-111
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスHomogeneous ZnO powders with antibacterial activity have been synthesized by hydrothermal treatment at 160∼190°C under 1.01∼1.09 MPa for 10∼50 h using Zn(NO3)2·6H2O, hexamethylenetetramine ((CH2)6N4) and ethanol. Their particle morphology and specific surface areas have been characterized in relation with the synthesis conditions. A luminol chemiluminescence (CL) measurement has been applied to evaluate their antibacterial activity under dark conditions. Experimental results revealed that the ZnO nanorod powders (a length ≤ 500 nm and a diameter ≤ 100 nm), prepared under the conditions of 160°C/20h/1.09MPa, showed the highest photon counts of 3.75×105, which value was ten times higher than that (3.59×104 counts) of conventional ZnO powders commercially available.抄録全体を表示PDF形式でダウンロード (1415K) -
高岡 勝哉, 村瀬 康, 加藤 将樹, 廣田 健2010 年 57 巻 2 号 p. 112-117
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスSynthesis of dense composite materials with the compositions of Al2O3/Mo2N=100/0∼40/60 vol% has been attempted directly from Al2O3/Mo mixed raw powder compacts using capsule-free N2 hot isostatic pressing (HIP). During HIPing [1500°C/(16∼20-200MPa)/1h], solid/gas reaction between Mo and N2 was introduced to form Mo2N. The most of sintered composites consisting of only Al2O3 and Mo2N phases reached to a higher relative density than 98.0 % with closed pores nevertheless capsule-free HIPing. Dispersion of Mo2N particles just formed suppressed the grain growth of Al2O3 during sintering. Mechanical properties, such as bending strength (σb), Vickers hardness (HV), fracture toughness (K1C), and other properties have been evaluated as a function of their compositions. The best mechanical values of σb (∼573 MPa), HV (∼20.3 GPa) and K1C (∼5.00 MPa·m1/2) were attained at the composition of Al2O3/Mo2N=90/10 vol%, due to a high density (98.6 %) and small grain size of Al2O3 matrix (Gs∼4.70 μm). Further addition of Mo2N reduced the sinterability of matrix grains, resulting in low densities of around 90 % at the 40/60 vol% composition.抄録全体を表示PDF形式でダウンロード (1316K) -
中村 英文, 佐藤 嘉, 千葉 晶彦, 村上 まどか, 野村 直之, 塙 隆夫, 阿部 孝悦2010 年 57 巻 2 号 p. 118-125
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスThe main objective of the present work is to evaluate the effects of the addition of zirconium on the mechanical properties of Co-29Cr-6Mo sintered parts produced by metal injection molding process using water atomized powder as raw materials. The results are summarized as follows;
1) The sintering density of Co-29Cr-6Mo alloy powder was increased by the addition of zirconium in both sintering atmosphere of argon and nitrogen.
2) Mechanical properties were also improved by the addition of zirconium in both sintering atmosphere of argon and nitrogen. By using MIM process, the products having better mechanical properties compared with casting method were obtained.
3) HIP treatment of sintering products increased the relative density by about 4 % caused by diminishing pores. This densification produced the increase of tensile strength and 0.2 % proof stress by about 100 MPa.抄録全体を表示PDF形式でダウンロード (1105K) -
中村 英文, 豊島 寿隆, 千葉 晶彦, 阿部 孝悦2010 年 57 巻 2 号 p. 126-133
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスThe main objective of the present work is to evaluate the effects of Zr addition on various properties of SUS316L stainless steel powders produced by water-atomization of liquid metals. The results are summarized as follows;
1) The sintering density of SUS316L stainless steel powders pre-alloyed with 0.05 mass% of Zr was about 2 percent higher than that of the powder containing no Zr. However, in the powder pre-mixed with 0.05 mass% of Zr, no effect of Zr addition was observed.
2) Mechanical properties were improved by pre-alloying with Zr, but impaired by pre-alloying with Zr.
3) In pre-alloyed powder with 0.05 mass% of Zr, the increase of sintering density to start from 1073 K was observed. The micro-structural observation showed that the neck formation between particles started at 1073 K. The temperature is lower by about 100 K compared with the powder containing no Zr.抄録全体を表示PDF形式でダウンロード (1434K)
新技術・新製品
新技術・新製品
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浦井 智明, 本田 知広, 蔵田 克彰, 高見 明秀, 滝田 祐作2010 年 57 巻 2 号 p. 137-139
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスPDF形式でダウンロード (1531K) -
宇波 繁, 尾崎 由紀子, 尾野 友重2010 年 57 巻 2 号 p. 140-142
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスPDF形式でダウンロード (618K)
本会記事
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2010 年 57 巻 2 号 p. Pref2_1
発行日: 2010年
公開日: 2010/04/16
ジャーナル オープンアクセスPDF形式でダウンロード (84K)
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