粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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57 巻, 6 号
June
選択された号の論文の22件中1～22を表示しています
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研究
研究速報
  • Cr-Cu-Te三元化合物の機械的特性
    菊池 茂, 中村 清美, 馬場 昇
    2010 年 57 巻 6 号 p. 383-386
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.383
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    Cr-Cu sintered electric-contacts for vacuum insulated switch need to be separated easily when they were welded together by Joule heat. Therefore, the Cr-Cu sintered materials need to be low strength. We have already reported that Te addition was effective in strength reduction and it was affected by Cr-Cu-Te ternary compounds between Cr particles and Cu matrix. In this work, we tried to prepare the ternary compound and evaluated its mechanical properties.
    Cr2CuTe4 compound was prepared from 48.2mass%Cu2Te-51.8mass%Cr2Te3 compact by PM method and SPS (Spark Plasma Sintering) method. Fracture toughness (KIC) of this compound measured by IM (Indentation Microfracture) method was 76 MPa·m1/2, which showed the brittleness of this compound compared with Cr. The reduction in destruction energy of Cr-Cu-Te sintered material is considered to be caused by this brittle ternary compound.
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研究
  • 射出成形による鉄系軟磁性粉末の高密度化(第2報)
    長田 稔子, 田中 良知, 三浦 秀士, 徳岡 輝和, 西岡 隆夫
    2010 年 57 巻 6 号 p. 387-391
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.387
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    Ferrous soft magnetic materials are required several efforts to realize high performance magnetic properties. In powder metallurgy processing, both high density and high purity are necessary to obtain the excellent soft magnetic properties. Metal injection molding (MIM) process is hoped to be an effective technique to produce the high density and more complex shaped parts from Fe-Si hard metal powders. In this study, Fe-6.5Si sintered compacts were produced by MIM process using elemental powders and their magnetic properties were investigated. The oxygen contents of sintered compacts were strongly influenced by the original powder, and the lower oxygen content powder showed high density and good soft magnetic properties.
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特集：自動車用磁性材料の進歩
総報
総説
  • Nd-Fe-B系焼結磁石における省Dy技術の研究動向
    杉本 諭
    2010 年 57 巻 6 号 p. 395-400
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.395
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    Nd-Fe-B sintered magnets are widely used in many applications and the motor for hybrid electric vehicles (HEV) becomes one of the promising applications for the magnets. However, as the operating temperature of the magnets becomes over 200°C in the application, a room temperature coercivity around μ0HcJ=3 T is needed. To meet this requirement, currently shipped Nd-Fe-B magnets contain a huge amount of Dy. But, this method has a crucial disadvantage. That is, an estimated short supply of Dy owing to its low natural abundance as compared with that of Nd. In order to realize a high μ0HcJ in Nd-Fe-B magnets without Dy or with a much-reduced Dy content, and to secure a stable future supply of these high-performance magnets, a five year national project has started in Japan. This paper introduces unique researches in the project toward Dy-free or Dy-lean Nd-Fe-B sintered magnets.
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研究
  • MA-SPSプロセスによる磁性アルミニウム複合材料の創製
    青木 翔, 久保田 正広
    2010 年 57 巻 6 号 p. 401-406
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.401
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    In order to fabricate the Al-based composite materials possessing magnetic properties, air-atomized pure aluminium powder together with Ni-Cu-Zn Ferrite (FR) powder was mechanically alloyed (MAed) using a vibrational ball mill, and the MAed composite powders were consolidated into bulk materials by spark plasma sintering (SPS). Changes in constituent phases, particle size, hardness and soft magnetic properties of both the MAed powders and SPS materials were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), hardness measurements and vibrating sample magnetometry (VSM), respectively.
    No solid-state reactions could be detected by XRD in the MAed powders. The Vickers microhardness of the MAed powders increased by increase in MA time. The saturation magnetic flux density for the MAed powders were found to depend only upon the amount of the FR powder present. Ni-Cu-Zn Ferrite was decomposed to form ZnO when the MAed powder was sintered at 673 K and 773 K by SPS, whereas Al13Fe4 and Al4C3 were detected when the MAed powder was sintered at 873 K. The highest saturation magnetic flux density was obtained when the MAed powder were consolidated at 773 K.
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特集：自動車用焼結材料の新たな展開
総報
研究
  • 高密度焼結鋼の疲労強度に及ぼすミクロ組織の影響
    松本 伸彦, 三宅 賢武, 近藤 幹夫, 安藤 公彦
    2010 年 57 巻 6 号 p. 409-413
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.409
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    We have already reported that die wall lubricated warm compaction followed by high temperature sintering enabled the high sintered density above 7.7 Mg/m3 and the excellent tensile strength of 2200 MPa.
    In order to improve the mechanical property of highly densified sintered steel, we have tried to control the microstructure by the combination of fine and coarse powders of different chemistry, and production of composite structure of ductile martensite as a matrix and hard martensite in the sinter-neck regions proved to be an effective method to increase the tensile strength.
    In this paper, the effect of the microstructure on the rotating bending fatigue strength of the highly densified sintered steel was investigated. In case of bright quenching and tempering, the endurance limit of the composite structure was 580 MPa which was the same as the single-phase structure. The crack origin was the large residual pore which consisted of some adjacent residual pores. In case of carburized quenching and tempering, the endurance limit of the composite structure was 615 MPa less than the fatigue strength of wrought steel at 107 cycles, and the crack origin was the grain boundary near the specimen surface.
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  • 環境調和型Cuフリー焼結鋼
    三宅 賢武, 松本 伸彦, 近藤 幹夫, 竹本 恵英, 安藤 公彦
    2010 年 57 巻 6 号 p. 414-418
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.414
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    Fe-Cu-C sintered steels are widely used for automobile parts. However, low-cost Cu free general-purpose sintered steels are also required from the viewpoint of recycling because Cu in steels deteriorates their properties. In this study, Mn and Si were selected as new strengthening elements to replace Cu and the effects of additive method and amount of Mn and Si on the strength were investigated by Fe-Mn-Si-C steels sintered in a nitrogen atmosphere with low-oxygen partial pressure. It was shown that the Fe-Mn-Si ternary master alloys were desirable as the additive method, the addition of 1-2 % Fe-Mn-Si master alloys whose Mn/Si ratio (in mass%) was more than 1 showed mechanical properties superior to the Fe-Cu-C sintered steels.
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  • 4600系焼結合金鋼の面圧疲労強度に及ぼす原料粉末の影響
    三浦 秀士, 津守 不二夫, 中原 好友, 徳岡 輝和, 西岡 隆夫
    2010 年 57 巻 6 号 p. 419-423
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.419
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    This study aims cost reduction of high load gear manufacturing, and attempts to substitute P/M gears for conventional wrought steel gears. In order to improve the fatigue strength of the P/M gears, we focused attention on the high performance 4600 sintered alloy steels with heterogeneous microstructure which were made from the mixed elemental powder in comparison with homogeneous microstructure from the prealloyed powders. The fatigue strength was measured by a two cylinder type rolling contact fatigue testing machine, and the effect of the different microstructure on the fatigue strength was mainly investigated. As the result, the endurance limit at N=1.0×107 of the mixed elemental powder compacts showed 1.45 GPa, which was slightly higher than that of the prealloyed powder compacts (1.32 GPa). Also, their values are about 75 % of the endurance limit of wrought steels (SCM415 case-hardened).
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  • 1.5Cr-0.2Mo焼結合金鋼ローラの表面転造特性と面圧疲労強度
    竹増 光家, 小出 隆夫, 武田 義信, 新仏 利仲, 上村 大輔, 齋藤 一樹, 中村 章二
    2010 年 57 巻 6 号 p. 424-429
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.424
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    Fundamental surface rolling experiments were carried out using rollers of 1.5Cr-0.2Mo alloyed sintered steel having the density of 7.00∼7.55 g/cm3. A high precision CNC form rolling machine of 2-roller dies transverse type was employed. Pore distributions and endurance limits in rolling contact fatigue were investigated. After rolling, casehardening was conducted. The surface densification of this P/M material with the initial density of 7.25 g/cm3 or more has possibilities to make the part surface to a depth fully dense by optimizing the rolling condition. The surface fatigue durability of rolled P/M rollers with the initial density of 7.55 g/cm3 almost matches that of case carburized wrought alloyed steel rollers.
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  • 鉄系焼結合金ローラの転造による面圧疲労強度の向上－第２報－
    三浦 秀士, 津守 不二夫, 浜本 昭太, 河本 浩介, 宇波 繁
    2010 年 57 巻 6 号 p. 430-434
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.430
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    Due to the continual improvements of powder metallurgy techniques, it is possible for sintered materials to compete the wrought materials even in some of the most demanding applications. However, strength of sintered materials was normally inadequacy, because they have a lot of pores. This paper describes a study on the effects of the amount of rolling and effective hardened depth by case hardening on the contact fatigue strength of sintered ferrous alloy compacts and the contact fatigue damage mechanisms. Porosity at the vicinity of the surfaces of rolled compacts was decreased with increasing the amount of radial feed, from which the contact fatigue strength of rolled compacts was improved. Furthermore rolling contact fatigue strength of rolled and case hardened compacts was more improved.
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  • 鉄系焼結合金歯車の転造による高精度化・高強度化　－第３報－
    修整歯形工具による鉄系焼結合金歯車の歯元曲げ疲労強度向上
    三浦 秀士, 津守 不二夫, 竹増 光家, 河本 浩介, 浜本 昭太, 宇波 繁
    2010 年 57 巻 6 号 p. 435-441
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.435
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    Surface finish rolling experiments were carried out using P/M spur gears of 0.6Mo-0.2Mn pre-alloyed sintered steel and of 0.8Mo-0.2Mn partially alloyed sintered steel with the density of 7.10 Mg/m3. A CNC form rolling machine of axis intersection type was employed, and a modified screw-shaped rolling tool was prepared: the modified concave tooth profile optimized by numerical tooth profile analysis for simultaneous rolling of tooth and fillet surface. Then, porosity distributions in the surface layer of rolled gear teeth were determined and the effects of the amount of tool radial feed R0 on the selective surface densification behaviors were evaluated. Besides, single tooth bending fatigue test was conducted. Gears with good tooth profiles were obtained by using the modified tools. As a result, the porosities in both the tooth flank and the fillet at the root were reduced to the target level at R0=600 μm in simultaneous rolling process. Furthermore, the single tooth bending fatigue durability was much improved to about 60 % of the case hardened wrought steel gears of SCM415.
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  • 自動車トランスミッション用1.5Cr-0.2Mo焼結合金鋼歯車の表面転造特性と荷重負荷能力
    竹増 光家, 小出 隆夫, 石丸 良平, 武田 義信, 新仏 利仲, 上村 大輔, 齋藤 一樹, 中村 章二
    2010 年 57 巻 6 号 p. 442-448
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.442
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    A spur gear of the 1.5Cr-0.2Mo sintered alloy steel having a density of 7.55 g/cm3 was surface rolled using a high precision CNC form rolling machine of two-roller dies transverse type. The rolling process was designed to get good surface densification and tight tolerances on the gear tooth profile. After rolling, carburized and quenching treatment were conducted. Pore distribution of the rolled gear tooth was investigated. Running tests were carried out to determine a failure mode and load bearing capacity of this P/M gears. The test results show that the feasibility of using transverse form rolling for this high density Cr-Mo P/M material to obtain high precision gears with enough durability to replace case-carburized wrought steel gears made of typical Cr-Mo alloyed steel.
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  • 自動車トランスミッション用1.5Cr-0.2Mo焼結合金鋼歯車の曲げ疲労強度と衝撃強度
    竹増 光家, 小出 隆夫, 石丸 良平, 武田 義信, 新仏 利仲, 上村 大輔, 齋藤 一樹, 中村 章二
    2010 年 57 巻 6 号 p. 449-454
    発行日: 2010年
    公開日: 2010/08/10
    DOIhttps://doi.org/10.2497/jjspm.57.449
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    Single tooth bending fatigue tests were carried out using spur gears of 1.5Cr-0.2Mo sintered steel having a density of 7.55 g/cm3 and the effects of surface rolled or shot peening (WPC) on bending fatigue strength were examined. P/M gears were case-carburized. The bending fatigue durability of this P/M gears not surface densified is equal to that of case-carburized wrought alloyed steel gears of SCM415. The bending fatigue limit of the P/M gear was much improved by WPC. The impact strength of P/M gear tooth was investigated using an impact testing machine for gears. The mean value of peak impact damage torque of the surface rolled P/M gears almost matches that of wrought steel gears of SCM415. Both test results indicate the feasibility of this high density Cr-Mo P/M gears to replace case-carburized wrought steel gears made of typical Cr-Mo alloyed steel.
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