巻号一覧
58 巻, 6 号
June
選択された号の論文の17件中1～17を表示しています
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2011 年 58 巻 6 号 p. 311-316
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (3688K) -
2011 年 58 巻 6 号 p. 317-322
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (275K)
研究
研究
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岩岡 拓, 中村 満2011 年 58 巻 6 号 p. 327-333
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスWarm compaction is known as an efficient way to increase green density, which contributes to increase strength after sintering. In this study, the application of a warm compaction method to the pure magnesium powder was investigated. The compressibility and compaction behavior of pure magnesium powder compacted at various temperatures and pressures were measured. The porosity and ejection stress of the pure magnesium green compacts processed at 373 K under a pressure of 489 MPa were about 0.5 % and 1.4 MPa, respectively. It was found that sintered transverse rupture strength of the warm compacted specimens is higher than that of the cold compacted specimens. The difference in strength between cold and warm compacted specimens increased with increasing sintering temperature. The maximum difference was about 40 MPa. The increase of the sintered strength is considered to be due to the increase in contacting area among the powder particles promoted by the warm compaction. In conclusion, the experimental results showed that the warm compaction method is an effective method to compact a pure magnesium powder into near full density and therefore to increase the sintered strength.抄録全体を表示PDF形式でダウンロード (1480K) -
平塚 信之, 神野 恭平, 神島 謙二, 柿崎 浩一, 石丸 雄大, 酒井 政道2011 年 58 巻 6 号 p. 334-339
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスNano-crystalline NiFe2O4 (NF) powder was prepared by a sol-gel auto-combustion method. Its crystal structure, morphology, particle size and magnetic properties were investigated and the formation process of nano-crystalline NF was elucidated. The as-dried Ni-Fe precursor (Ni/Fe=0.5) was calcined in air at 200-800°C for 4 hours. γ-Fe2O3 powder was formed at about 210°C by the self-combustion of the gel, and was maintained at 200-400°C. Single-phase NF sample was obtained by being calcined at 600-800°C. The NF particles were of nano-crystalline with crystallite diameters of 68.2-94.3 nm which were determined by the use of Scherrer equation for XRD peak broadening and the observation of TEM images. The sample calcined at 200°C had a magnetization value of 44 emu/g, which was lower than that of bulk γ-Fe2O3 (70 emu/g) because of a lot of vacancies at octahedral sites. Magnetization was increased gradually with increasing calcination temperature, and reached to the maximum value of 46 emu/g for the samples calcined at 700 and 800°C, which was in agreement with the magnetization of the bulk NF sample. Coercivity was decreased with increasing calcination temperature.抄録全体を表示PDF形式でダウンロード (1048K)
特集：高性能・高機能型焼結材料の自動車部品への応用
総報
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石井 啓2011 年 58 巻 6 号 p. 342
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (134K)
研究
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三宅 賢武, 松本 伸彦, 近藤 幹夫, 安藤 公彦2011 年 58 巻 6 号 p. 343-349
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスFe-Cu-C sintered steels are widely used for automobile parts. In case of reusing these sintered steels as the raw materials of wrought steels, it becomes to be a problem that Cu contamination deteriorates hot workability of wrought steels. In order to recycle the scrapped sintered steels, Cu free sintered steels are strongly required. We developed new Fe-Mn-Si-C sintered steel as a candidate material to the conventional Fe-Cu-C sintered steels. The developed sintered steel shows superior mechanical properties compared with the conventional sintered steels by adding Mn and Si elements to the Fe-Mn-Si ternary master alloy (FeMS) powder.
In this study, the influence of sintering temperature and also particle size of FeMS powders on the mechanical properties of the new Fe-Mn-Si-C sintered steels were investigated. The tensile strength is improved by not only rising sintering temperature and also adding the fine FeMS powder. In particular, this improvement is considered to be resulted from the microstructural changes as follows. The addition of the fine FeMS powder works to increase amount of the fine pearlite phase in whole of the microstructure and also inhibit the precipitation of the martensite phase at the Mn and Si enriched regions.抄録全体を表示PDF形式でダウンロード (2151K) -
徳岡 輝和, 山本 龍, 工藤 健太郎, 津守 不二夫, 三浦 秀士, 西岡 隆夫2011 年 58 巻 6 号 p. 350-354
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスThis study aims at reducing costs of high load gear manufacturing, and substituting P/M gears for conventional wrought steel gears. In order to improve the fatigue strength of P/M gears, we focused on the rolling and the high performance sintered and heat treated 4600 series alloy steels with mezzo-heterogeneous microstructure which were made from the mixed elemental powders. The fatigue strength was determined by single tooth root bending fatigue test machine, and the effect of mezzo-heterogeneous microstructure and rolling on the fatigue strength was mainly investigated. The endurance limit at N=3.0×106 of the 500 μm rolled 6 % Ni alloy steel gear compact showed 950 MPa which value is about 2/3 of the case hardened wrought steel (SCM415) gears. However, the endurance limit of rolled and heat treated gear compact showed lower value (630 MPa) as compared to as-rolled gear compact. This seems to be due to the decreasing the compressive residual stress by heat treatment and unfavorable mezzo-heterogeneous microstructures.抄録全体を表示PDF形式でダウンロード (1426K) -
野田 宗巨, 長田 稔子, 津守 不二夫, 三浦 秀士2011 年 58 巻 6 号 p. 355-360
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスTitanium and its alloy have many advantages such as high specific strength, excellent corrosion resistance and biocompatibility. However, it is not easy to fabricate the complex shaped parts using titanium alloy because of their poor machinability and workability. Metal injection molding (MIM) process is hoped to be a suitable technique to fabricate three dimensional complicated parts of titanium and its alloy. Although the static mechanical properties of injection molded titanium alloy compacts have been studied, there are few reports regarding the dynamic fracture characteristics. In this study, pure titanium and Ti-6Al-4V alloy compacts are fabricated by MIM process and the effects of sintering conditions on the fatigue properties are mainly investigated. By optimum sintering conditions, over 95 % of sintered densities were obtained and the fatigue endurance was 164 MPa for pure titanium and 230 MPa for Ti-6Al-4V alloy, respectively.抄録全体を表示PDF形式でダウンロード (1609K) -
相良 堅作, 西田 稔, 姜 賢求, 津守 不二夫, 三浦 秀士, 中山 英樹2011 年 58 巻 6 号 p. 361-366
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスTitanium alloys have been used especially as aerospace, medical and dental materials because of their excellent attributes of high corrosion resistance and high specific strength. A Ti-10V-2Fe-3Al is one of β-titanium alloy and it shows super-elasticity. In this study, the fabrication of super-elastic Ti-10V-2Fe-3Al alloy compacts by metal injection molding which is one of near net shape forming of powders was investigated using mixed elemental and alloy powders. Under the optimized MIM process condition, nearly full density (97∼98 %) was obtained and the tensile properties of strength and elongation were 1000∼1050 MPa and around 5 %, respectively. Moreover, after solution treatment and aging, the compacts with alloy powder showed clearly super-elasticity.抄録全体を表示PDF形式でダウンロード (1976K)
総説
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神戸 満, 地主 孝広, 石島 善三2011 年 58 巻 6 号 p. 367-373
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスAn encapsulated thermoelectric (TE) module consists of a vacuum tight stainless steel container of 55×50×11 mm in which a SiGe or BiTe TE module is encapsulated. This situation enables maximum performance and durability because (1) the thermal expansion mismatch between the hot and cold sides of the container can be accommodated by a sliding sheet in the container, (2) the TE module inside is always kept in a vacuum environment, therefore no oxidation can occur, and (3) the difference in pressure between the inside and outside of the container reduces thermal contact resistance inside the container. The encapsulated module could be applied to various environments and features maximum TE power with minimum installation cost. An attempt has been made to adopt the encapsulated TE modules to make use of waste heat of the powder metallurgy furnace. Heat transfer analysis and cost evaluation of the system have been made. Demonstration of the encapsulated TE module performance at the powder metallurgy furnace has been conducted and proven 3000 hr operation.抄録全体を表示PDF形式でダウンロード (1740K)
研究
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大場 彩加, 神島 謙二, 柿崎 浩一, 石丸 雄大, 酒井 政道, 平塚 信之2011 年 58 巻 6 号 p. 374-379
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスSr2FeMo1-xVxO6 (x=0-1.0), Sr2-yBayFeMo0.8V0.2O6 (y=0-1.0) and Sr1.4Ba0.6Fe1-zMnzMo0.8V0.2O6 (z=0-1.0) samples were prepared by using a conventional ceramic method. The crystal structure, bulk density and resistivity of the samples were investigated. The thermoelectric properties of Sr2-yBayFe1-zMnzMo0.8V0.2O6 were examined. In the X-ray diffraction patterns of the samples sintered at 1200°C, the double perovskite phase was confirmed. Sr1.4Ba0.6FeMo0.8V0.2O6 sample had the highest conductivity in Sr2-yBayFe1-zMnzMo0.8V0.2O6 samples. The Seebeck coefficients S of Sr2-yBayFe1-zMnzMo0.8V0.2O6 are negative for 100°C < T < 700°C so that these samples are n-type semiconductors. In particular, the power factor S2σ of Sr2-yBayFe1-zMnzMo0.8V0.2O6 samples increased with increasing Ba and Mn doping up to y=0.6 and z=0.2. The power factor S2σ of Sr1.4Ba0.6Fe0.8Mn0.2Mo0.8V0.2O6 showed the largest value of 83.2 mW/K2m.抄録全体を表示PDF形式でダウンロード (615K)
本会記事
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2011 年 58 巻 6 号 p. Pref6_1
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (412K) -
2010 年 58 巻 6 号 p. Mtg6_2-Mtg6_5
発行日: 2010年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (309K) -
2011 年 58 巻 6 号 p. 323
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (247K) -
2011 年 58 巻 6 号 p. 380-401
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (460K) -
2011 年 58 巻 6 号 p. 402
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセスPDF形式でダウンロード (76K)
掲載論文の取り消しについて
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掲載論文の取り消しについて:Fe-Based Glassy Magnetic Cores Prepared by Spark Plasma Sintering Glassy Alloy PowdersBaolong Shen, Akihisa Inoue2011 年 58 巻 6 号 p. 403
発行日: 2011年
公開日: 2011/07/15
ジャーナル オープンアクセス掲載論文の取り消しについて
「粉体および粉末冶金」編集委員会, 委員長 吉村 一良
「粉体および粉末冶金」Vol.50, No.9に掲載の下記論文1について，先に投稿された下記論文2の内容と著しく重複していることが判明しました．
「粉体および粉末冶金」編集委員会では，本件に関し，粉体および粉末冶金投稿規程及び研究倫理上の理由によって，当該論文の掲載を取り消すことにいたしました．
この処置は，論文1が論文2の審査中に投稿されたものであり，また論文1中に論文2の引用もなかったため，論文内容の重複について審査段階で認識することができなかったための処置であります．
○論文1：Fe-Based Glassy Magnetic Cores Prepared by Spark Plasma Sintering Glassy Alloy Powders, Baolong Shen and Akihisa Inoue,粉体および粉末冶金, Vol.50, No.9 (2003) 680-686. ( Received May 2, 2003 )
○論文2：Fabrication of large-size Fe-based glassy cores with good soft magnetic properties by spark plasma sintering, Baolong Shen and A. Inoue, Journal of Materials Research, Vol.18, No.9 (2003) 2115-2121. ( Received 27 April, 2003, accepted 10 June, 2003 ).抄録全体を表示PDF形式でダウンロード (32K)
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