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  • C.G. Goetzel, J.B. Rittenhouse
    粉体および
    粉末冶金

    1967年 14 巻 5 号 195-202
    発行日: 1967/08/25
    公開日: 2009/12/04
    ジャーナル フリー
    粉末冶金
    の製品は,一般の航空方面への応用とともに,宇宙衛星の部品として利用されるようになった.宇宙衛星の関係部品は,高度に特殊化された目的を満足させるたあに,広範な発展計画を必要とするものである.この報告では,宇宙衛星に対するいくつかの
    粉末冶金
    の応用の紹介と,実際に軌道にのった宇宙衛星に使用された
    粉末冶金
    部品および材料の二,三の例について論ずる,
    粉末冶金
    製品の例として,93日間の飛行に成功したExplorer皿、のテープレコーダー中の焼結ブAンズベアリングがあり,また航空用衛星(その中には7カ月も活動したものもある)内の,自転抑制装置に用いられた焼結マグネットなどがある.化学的浸食熱応九融点近くの表面温度などに対する抵抗が要求されるようないわゆる高温熱流に対しては,Agを溶浸させたWが用いられる.これは
    粉末冶金
    法によってのみ作られるものである.この物質を十分に管理された製造工程のもとで製作するために,複合材料に最適の実用性質を発揮させるような広範な計画が開始された.
    粉末冶金
    法で製造されたBeの利点については,特に目下計画中,あるいは設計中の人間宇宙ステーションの表面材料として,および流星群の遮蔽防御などへの応用に対して検討されている.
  • 加藤 哲男, 倉田 規義, 包 于奮, 草加 勝司
    電気製鋼
    1996年 67 巻 4 号 267-272
    発行日: 2000/03/27
    公開日: 2000/03/27
    ジャーナル フリー
    Influence of the silicon content on the maximum magnetic flux density was studied on the sintered Fe-18Cr-2Mo alloy at applied magnetic field in three Oersted. The highest maximum magnetic flux densities in DC and AC magnetic field were attained at the content of two-percent silicon. The lower magnetic properties was observed for the three-percent silicon or more. The sintered density and the DC maximum magnetic flux density consequently were improved with the rise of sintering temperature. On the other hand the AC maximum magnetic flux density indicated the change of a decrease after an increase. An excess sintering temperature rather causes a lowering of AC maximum magnetic flux density. An increase of the resistivity contributes to an improvement of AC maximum magnetic flux density on the whole, but for the lower sintered density, tends to cause the deteriorating of AC maximum magnetic flux density. The comparison of measured and calculated value for the frequency dependence
  • 上本 圭一
    電気製鋼
    2001年 72 巻 2 号 103-109
    発行日: 2001年
    公開日: 2001/05/15
    ジャーナル フリー
    The consumption of stainless steel powder used for sintered products has increased more remarkably than that of the other powders. This increase is mainly due to the increase of PM stainless steel sensor rings for anti-lock braking systems (ABS) and the expansion of ABS in auto-industries. However ABS market has almost saturated. For the additional increase of stainless steel powder consumption, the development of new markets is critically needed. Stainless steel materials have various advantages, and authors believe they can expand the application through suitable process developments. The advantages of sintered stainless steel are such as corrosion resistance, heat-resistance, magnetic characteristics, and wear resistance with chromium-carbide. This report shows some examples of application development and investigation of possible developments in the future.
  • 小林 慶三, 尾崎 公洋
    表面科学
    2008年 29 巻 10 号 601-606
    発行日: 2008/10/10
    公開日: 2008/10/22
    ジャーナル フリー
    In the Rare Metal Substitute Materials Development Project of the Ministry of Economy, Trade and Industry, dysprosium for a rare-earth magnet, indium for a transparent conducting electrode and tungsten for a cemented carbide tool are taken up, and sustained development of Japanese industry is supported. Tungsten is one of the resources unevenly distributed in China, and has and anxiety of the stable supply in the future. Tungsten is used as cemented carbide for manufacturing tools in our country. To reduce tungsten usage in the carbide tools, we are developing new technology in this project. One is development of a hybrid type-cutting tool, and another one is development of a composite structured hard material tool. In this paper, we introduce the technology for reducing tungsten usage in hard materials.
  • 加藤 哲男, 草加 勝司
    電気製鋼
    1977年 48 巻 2 号 137-143
    発行日: 1977/04/15
    公開日: 2009/05/25
    ジャーナル フリー
    The mechanical properties of sintered ferritic stainless steels were studied powdermetallurgically.
    The results were summarized as follows:
    (1) The tensile strength got higher with an increase of Cr wholly, while the resultant ductility was better for 18% or less of Cr because of good sinterability.
    (2) The tensile strength got higher, without loss of ductility in 2% or less of Si and Mo addition to 12∼18% Cr-regions.
    (3) The porosity-sensitive toughness was appreciably improved at higher sintering temperature due to spherodization of residual pores.
    (4) External notch (Kt∼4) in tensile test gave the loss of 20% or less to original tensile strength almost independent of porosity.
  • Baolong Shen, Akihisa Inoue
    粉体および
    粉末冶金

    2011年 58 巻 6 号 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 ).
  • 武谷 良明, 早坂 忠郎
    電気製鋼
    1977年 48 巻 2 号 119-121
    発行日: 1977/04/15
    公開日: 2009/05/25
    ジャーナル フリー
    An investigation was made about mechanical properties of 3 kind's sintered stainless steel of SUS410L, 316L and 304L after sintering in vacuum and in reducing atmosphere.
    As the result, it was observed that the elongation of those sintered in reducing atmosphere is smaller than those sintered in vacuum.
    Hereunder have been described about some product examples to which the results are practically applied.
  • 山口 喬
    材料
    1965年 14 巻 144 号 741-745
    発行日: 1965/09/15
    公開日: 2009/07/09
    ジャーナル フリー
    The effect of calcination and ball-milling on the properties of Ni·Zn-and Mn·Zn-ferrite powders was studied and the results are discussed on the basis of theoretical considerations on tap density. It is shown that the ball-milling has two different effects on the powder properties depending on whether the temperature of calcination is above or below the recrystallization temperature. It is found that striking correlations exist among these properties, and that the tap density is one of the most useful and convenient parameters not only for the evaluation of powder history but also for the prediction of sintering performance.
  • 三浦 秀士
    電気製鋼
    1994年 65 巻 2 号 91-97
    発行日: 1994/04/20
    公開日: 2009/05/25
    ジャーナル フリー
    Metal Injection Molding (MIM) is becoming a cost-effective production route for relatively small, complex and high performance metal components. This process also alleviates the need for secondary working operations because of providing net shape components. This is hoped to be a suitable production route for hard materials such as high speed steels. The purpose of this work is to test the feasibility of using the MIM approach to attain the same performance properties as those of the high speed steels produced by conventional P/M processes.
    In this work, the debinding and sintering parameters were optimized in terms of carbon content, density and microstructure for water and gas atomized powders with different powder characteristics. Subsequently, the effect of heat treatment on the mechanical properties of those fully dense materials was investigated with the microstructure analysis. Finally, high performance properties such as a transverse ruputure strength over 3GPa and a hardness of 70HRC were obtained with full density and fine scale microstructures through the optimum heat treatments by using water atomized powder.
  • 石井 啓, 筒井 唯之, 山西 祐司
    電気製鋼
    2003年 74 巻 4 号 247-258
    発行日: 2003/10/15
    公開日: 2010/03/23
    ジャーナル フリー
    Technology trends in sintered structural parts that account for 90% of all the powder metallurgical products produced by Hitachi Powdered Metals are introduced, focusing on materials and manufacturing technologies. The development of new sintered materials to meet the market's needs for higher strength, higher accuracy, cost reduction and manufacturing technologies such as warm compaction, die wall lubrication, multi-stepped compacting and sinter diffusion bonding that provide high density and complex shapes are outlined.
  • 黒田 義和, 泉 久司, 砂田 久吉, 深浦 健三
    材料
    1989年 38 巻 430 号 771-776
    発行日: 1989/07/15
    公開日: 2009/06/03
    ジャーナル フリー
    The injection moulding for sintered products has recently attracted a great deal of interest because the moulding method has a relative freedom to shape intricate geometries. The purpose of this investigation was to clarify the effects of Mn/Si ratio and sintering temperature on the mechanical properties of sintered stainless steel. The materials used were two kinds of stainless steel powder having an approximately equal particle size and a similar chemical composition except Mn.
    The results obtained are as follows;
    (1) The tensile strength of the sintered stainless steels was 540MPa regardless of the Mn/Si ratio and was almost equivalent to that of the conventional SUS304. In addition, it was found that the logarithm of the tensile strength was proportional to the volume fraction of pores.
    (2) The fatigue limit of the specimen having a relatively low Mn/Si ratio was 328MPa, while the specimen having a high Mn/Si ratio exhibited a significantly low fatigue limit, that is, 265MPa.
    (3) It became clear from these results that the fatigue properties varied considerably with the Mn/Si ratio. The ratio affected the volume fraction, the composition and the shape of the oxides. The high Mn/Si ratio seemed to produce sharp pores from which the fatigue cracks initiated easily.
  • 加藤 哲男, 手塚 広吉, 草加 勝司, 鈴木 喜代志
    電気製鋼
    1975年 46 巻 1 号 4-10
    発行日: 1975/01/31
    公開日: 2009/05/25
    ジャーナル フリー
    The recent powder metallurgy, especially the demand for sintered products of iron and alloy steels is rapidly increasing and it has also been magnified into the field of high alloy steels together with the tendency of higher density and bigger size.
    In order to cope with such situation we decided to push the mass production of powder of raw material and a study was made about powder manufacturing conditions such as water jetting, atomizing of melt etc. after trial installation of powder manufacturing apparatus by means of atomizing method.
    Furthermore, researching was done about the influence of atomizing conditions upon characteristics especially about stainless steel powder among high alloy steels. After the results we finally could establish a industrial technique by which we are able to manufacture stainless steel powders for sintered products with stability.
  • *内藤 禎人, 浜田 賢一, 市川 哲雄, 浅岡 憲三
    日本歯科理工学会学術講演会要旨集
    2007年 2007s 巻 P-005
    発行日: 2007年
    公開日: 2008/03/05
    会議録・要旨集 フリー
    生体親和性に優れるチタンの医用材料としての研究が盛んに行われており,チタン粉末を用いた
    粉末冶金
    による成形が考えられている.本研究では従来の
    粉末冶金
    法の最大の欠点である成形性の問題を改善すべく,チタン粉末とワックスを混練したチタン・ワックス混合体を創製した.その後バインダーの焼却,チタン粉末の焼結を経て所望の焼結体を得る.本研究では,その概要と焼結体の機械的特性,生物学的特性について検討した.
  • 小松 幹也, 池沢 健治
    電気製鋼
    1983年 54 巻 3 号 187-195
    発行日: 1983/07/31
    公開日: 2009/05/25
    ジャーナル フリー
    Today's trends of powder metallurgy in automotive materials are mainly on high strenght P/M materials, cost effective way and special use P/M materials.
    In this paper, we would like to show the technical topics of these trends;
    (1) P/M forgings for high strength structural P/M materials.
    (2) Utilization of cast iron swarf as lower cost powder.
    (3) Cold P/M forging technique.
    (4) Trends of aluminum P/M.
    (5) Super wear resistant materials for engine.
  • 伊藤 孝至, 草加 勝司
    電気製鋼
    2001年 72 巻 2 号 71-75
    発行日: 2001年
    公開日: 2001/05/15
    ジャーナル フリー
    Soft magnetic materials are microstructure-sensitive. The performance of porous magnetic materials manufactured by the P/M method, thus, is dependent upon the morphology of the residual pores, which makes differences in demagnetization, etc. The present study aims at examining the possibility for improvement in magnetism by the morphological control of the pores in powder metallurgy of magnetic materials. The morphological characteristics of the pores have been evaluated by the size-shape dispersion diagram proposed by the authors, and related quantitatively to the specific magnetic properties.
  • 沖本 邦郎, 岩本 和久, 加藤 欽之
    材料
    2004年 53 巻 9 号 938-943
    発行日: 2004/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    Granulated powder produced from fine powder for the MIM (metal powder injection molding) process was used to fabricate a composite part consisting of Fe-47Ni permalloy and SUS410L ferritic stainless steel. Green compacts of disk and ring shapes were separately fabricated and assembled into a unit. The Unit was sintered at 985°C-1255°C for 1h in vacuum. The use of the granulated powder increased the joint strength. In case of fine powder, cracking was observed frequently in the outer ring after sintering, but the generation of cracks did not occur in the granulated powder. The joint strength was discussed in terms of the inner disk and outer ring materials and the clearance between them. The joint strength of the composite prepared with a combination of an inner disk of SUS410L stainless steel and an outer ring of Fe-47Ni permalloy (B type) was superior to that of the composite fabricated with the opposite combination (A type). This is reverse to the result in using the fine powder for the MIM. It is due to the fact that difference (Δεθ) in the change in diameter between the outer ring and the inner disk of the granulated powder compacts by sintering is smaller than that of the fine powder compact. It can be concluded that, in the granulated powder, the effect of diffusion during sintering shrinkage on the joint strength is relatively lowered compared to the fine powder for MIM and the effect of thermal expansion of the inner disk is enlarged on the contrary.
  • 加藤 哲男, 草加 勝司
    電気製鋼
    1975年 46 巻 1 号 11-21
    発行日: 1975/01/31
    公開日: 2009/05/25
    ジャーナル フリー
    On the stainless steel powder produced by water-atomization by the determination of its composition balance was considered to be an important task. An investigation was made about water-atomized SUS316 stainless steel powders containing different amount of Si, Mn and C.
    The obtained results are as follows:
    (1) The powder is inclined to become irregular with the increase of Si composition. When Mn composition is much, the powder is inclined to spheroidize and more surface oxidation is found. As the result, apparent density decreases with the increase of Si composition and increase when Mn composition is much.
    (2) Green compact becomes hard to be broken when Si composition is much. Green strength value become almost fixed when Si is over 0.7% and gets weakened with the increase of Mn. C composition has strengthening effect on compact.
    (3) The compressability is found best when Si is about 1% or a bit less and Mn is less than 0.3%. It gradually decrease when Mn and C composition are increased.
    (4) The sintered density becomes highest around 1% of Si in vacuum sintering at 1, 180°C. The sintering properties at higher temperature is improved when Si composition is much.
  • 沖本 邦郎
    塑性と加工
    2011年 52 巻 600 号 70-74
    発行日: 2011年
    公開日: 2015/07/18
    ジャーナル 認証あり
  • 中川 威雄
    電気製鋼
    1987年 58 巻 4 号 260-270
    発行日: 1987/11/25
    公開日: 2009/05/25
    ジャーナル フリー
    Various kinds of advanced high technology materials are going to be produced from metal and ceramics powder materials. In order to give the shape to the powder, the powder compaction process is one of the most important key technologies in the consolidation of powder material.
    The authors have being investigated to develop new powder compaction and consolidation processes in the past 15 years. Sixteen new technologies which had been tried in the Nakagawa Laboratory of Institute of Industrial Science, University of Tokyo are briefly reviewed in this paper.
  • 電気製鋼
    2002年 73 巻 4 号 249-254
    発行日: 2002年
    公開日: 2003/02/21
    ジャーナル フリー
    Recently, the number of the car increases as the automotive industry develops. Therefore, the reduction of the environmental pollutant exhausted by the cars becomes a serious problem. Especially, the pollutant exhausted by the diesel engine such as NOx and particulate matter (PM) gives the life environment big damages. The generation of these environmental pollutants can be controlled by using magnetostrictive alloy for the control mechanism of the fuel injection system. Technical equipment is necessary for the industrial manufacturing though the single crystal of giant magnetostrictive alloy obtains large magnetostriction. Moreover, it is difficult for the single crystal to fabricate a compact with a complex shape. To obtain the compact of the polycrystal, the new process that mechanical alloying (MA) was combined with a pulsed current sintering(PCS) is reported to be effective. In this study, the effect of chromium addition on the magnetostriction and compressive strength of the (Tb0.5Dy0.5)(Fe1-xCrx)1.8 (x=0-0.2) compacts have been investigated. The powders of (Tb0.5Dy0.5)(Fe1-xCrx)1.8 (x=0-0.2) were synthesized by an MA of the elemental Tb, Dy, Fe and Cr powders using a planetary ball milling for 360 ks, and they were consolidated at 1273 K by PCS. The Cr addition has been very effective to improve compressive strength of the sintered alloys, which is attributed to the formation of ductile Fe-Cr phase. On the other hand, the Cr addition of x=0.2 decreased magnetostriction of the alloys due to an excess amount of Fe-Cr phase. As a result, it has been found that the optimum Cr content is x=0.05 for achieving large magnetostriction and high compressive strength simultaneously.
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