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, 10 号
October
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
  • 比透磁率が圧粉磁心の直流重畳特性へ及ぼす影響とそのモデル化
    繁田 進, 大島 泰雄, 赤岩 功太
    2010 年 57 巻 10 号 p. 647-653
    発行日: 2010年
    公開日: 2010/11/19
    DOIhttps://doi.org/10.2497/jjspm.57.647
    ジャーナル オープンアクセス
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    DC biased magnetic properties of Fe-3 mass % Si powder cores have been measured and compared with calculated values using a nonmagnetic grain boundary (NMGB) model. Aluminum oxide fine powder was added into magnetic powder in order to change permeability and the amount of the powder was 0, 0.25, 0.4, 0.7, 1.0 mass %. DC initial B-H loops were measured and differential permeability was calculated at each magnetic force H. The values were compared with calculated one using the NMGB model which was taken account of gap width distribution. Best agreement of relative inaccuracy was additive amount 0.4 mass %. In that case relative inaccuracy of the powder core was from -0.4 % to 8.4 % with non gap distribution and from -3.00 to 4.00 % with gap distribution. The most improved case was additive amount 0 %. Relative inaccuracy was from -6.0 % to 22.8 % with non gap distribution and from -4.40 to 9.20 % with gap distribution.
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  • Sintering and Mechanical Properties of Fly-ash/NiCr Compacts Prepared by Spark Plasma Sintering
    Mamoru Daio, Kazuhiro Hasezaki, Mariko Hosogi, Ichiro Yoshioka
    2010 年 57 巻 10 号 p. 654-659
    発行日: 2010年
    公開日: 2010/11/19
    DOIhttps://doi.org/10.2497/jjspm.57.654
    ジャーナル オープンアクセス
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    Fly-ash/NiCr-alloy functionally graded materials (FGMs) plates were prepared by spark plasma sintering (SPS); the plates were 100 mm in diameter and layer thicknesses of 0.6 mm and 1 mm. The plates consisted of stacked layers; the layers had volume ratio compositions of fly-ash/NiCr = (100/0 (A), 60/40 (B), 40/60 (C), 60/40 (B), 100/0 (A)). Two sorts of FGMs specimens with three layers prepared by machined from the FGMs plates with A/B/C/B/A five layers were investigated using a three-point flexural test. One sort of specimens had the normal stacking structure A/B/C, and the other had the reverse structure C/B/A, for the loading nose. After investigating the strengths of these two stacking structures, the fracture origins were observed at the surface of the extending C layer of the A/B/C structures, and of the A layer surface of the C/B/A structures. The deformation mechanism, average strength, and Weibull modulus were ductile, 12.0 MPa, and 5.5, respectively, for the normal A/B/C structure, and brittle, 46.7 MPa, and 13.1, respectively, for the C/B/A reverse structure. The different strengths of the two structures were explained on the basis of the strength of the extending surface layer, A or C, and the residual stress caused by the difference in thermal expansion coefficients of the stacking layers in the two structures. It was concluded that the fracture strengths of stacked FGMs materials were dominated by the stress field between the constituent layers and by the loading direction.
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  • Ti/SiC/C/TiC混合粉末圧粉体の常圧焼結によるTi3SiC2の合成
    橋本 等, 孫 正明, 中谷 泰宏, 青木 伸哉
    2010 年 57 巻 10 号 p. 660-664
    発行日: 2010年
    公開日: 2010/11/19
    DOIhttps://doi.org/10.2497/jjspm.57.660
    ジャーナル オープンアクセス
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    Titanium silicon carbide Ti3SiC2, a member of MAX-phase ternary compound ceramics, is expected as a new resistance heating element substituting for conventional ones including rare metals because of its excellent high-temperature oxidation resistance, metal-like electrical conductivity, good machinability and ubiquitous constituent elements. The authors tried to synthesize a large bulk Ti3SiC2 by pressureless sintering of a compacted powder blend of Ti, SiC and C, while the powder compact collapsed during sintering. Causes of the collapse were investigated and based on the investigation results a solution for the problem was found out. The large bulk Ti3SiC2 was synthesized successfully without collapse by the replacement of a part of Ti and C in the starting powders with TiC.
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企画セッション：高機能電子部品材料プロセスとその応用
総報
総説
  • フェライトの発明と成長の80年
    岡本 明
    2010 年 57 巻 10 号 p. 667-671
    発行日: 2010年
    公開日: 2010/11/19
    DOIhttps://doi.org/10.2497/jjspm.57.667
    ジャーナル オープンアクセス
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    Dr. Takeshi Takei, the professor at Tokyo Institute of Technology, discovered that oxides containing zinc and iron have distinguished magnetic properties. In 1930, Prof. Kato and Prof. Takei applied a patent for their discovery, which was granted in 1932 in Japan.
    Tokyo Denki Kagaku Kogyo (now TDK Corporation) was founded in 1935 to commercialize this newly invented ferrite cores as a venture company originated from the university patent of ferrite
    TDK started mass production of ferrite cores in 1937. Most of the shipped products were used in the local oscillators, mixers, and intermediate frequency transformers of military radios. These are the world first usage of ferrite to radio communication equipments. Ferrite largely contributed to reduce volume and weight of radio receiver compared with air coil.
    Until the end of the World War II, TDK was the only company in the world who could supply ferrite cores. TDK shipped a cumulative total of nearly 5 million pieces of ferrite cores by 1945.
    Many people have believed that Philips invented ferrites and they applied them to radio. But their first patent was applied in 1941 in Netherlands after they examined ferrite samples from TDK. This paper also explains about the patent dispute between Philips and TDK after the World War II which caused such misunderstanding.
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研究
  • Mgフェライト/パーマロイ・磁性ナノコンポジットの作製
    小幡 元基, 加藤 将樹, 廣田 健
    2010 年 57 巻 10 号 p. 672-677
    発行日: 2010年
    公開日: 2010/11/19
    DOIhttps://doi.org/10.2497/jjspm.57.672
    ジャーナル オープンアクセス
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    Dense {Mg(Fe1-xMnx)2O4/53Fe-47Ni permalloy (0≤x≤0.4)} magnetic nano-composites consisting of spinel and alloy phases have been fabricated from N2-atomized metal particles and fine-powder mixtures of MgO/α-Fe2O3/MnO using a combination of pulsed electric current pressure sintering (PECPS) and hot isostatic pressing (HIP). Fe-Ni permalloy particles were coated with the mixed metal oxide powders homogeneously by passing these mixtures through a narrow gap (1 mm) under high shear compression in Ar. Mixed powder compacts of permalloy with the fine metal oxides were densified into the green bodies having relative densities of 83-85 % under isostatic high pressure of 1 GPa at room temperature. Then green powder compacts were pre-sintered at 823 K for 3 min under a uniaxial pressure of 100 MPa in Ar using a PECPS. The pre-sintered bodies composed of spinel ferrite and permalloy revealed the relative densities of 94-96 %; the mixed metal oxides changed into magnesium spinel ferrites Mg(Fe1-xMnx)2O4 during a short heating time. Then hot isostatic pressing (HIP: (1123 K/6 h/200 MPa-Ar)) was adopted to sinter the pre-sintered bodies into a near full density without an encapsulation, however, a sintering atmosphere control was performed using a ferrite muffle in order to maintain the both phase. Sintered nano-composites with the relative density more than 99.5 % have a saturation magnetization density ≥1 T and moderate permeability values of 30-35 at 10 MHz, which values have been expected from a material design.
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受賞記念講演
総説
  • 電子材料部品における知的財産戦略—IP based Consortiumの活用—
    大嶋 洋一
    2010 年 57 巻 10 号 p. 683-688
    発行日: 2010年
    公開日: 2010/11/19
    DOIhttps://doi.org/10.2497/jjspm.57.683
    ジャーナル オープンアクセス
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    The number of patent for fine particle, one of the hottest topics of electrical materials and components, indicates the steady increase. Although Japanese patent still remains the same number as last decade in this field, Chinese patent has been increased rapidly in recent years.
    IP strategy for electrical materials and components fields is facing the new stages. Advanced IP strategy is tend to cooperative rather than competitive, because recent green related technologies, including new electrical materials and components, put emphasize on sustainable system which require the maximization of the benefit for all participant.
    This article proposed the new IP usage, IP based consortium, which can avoid the patent infringement case among the consortium members. In addition, IP based consortium can be functioned as the neutral and fairness organization to pool members fee and to distribute dividend to the contributors.
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本会記事
エラータ (Vol.57, No.8)
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