講演・口頭発表等 - 井藤　幹夫

Fabrication of diamond particle dispersed metal matrix composites by spark plasma sintering (SPS) for high thermal conductive materials 招待 国際会議

Mikio Ito

The 13th International Conference on Nanostructures, Nanomaterials and Nanoengineering, ICNNN 2024  2024年11月  Science and Engineering Institute

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Diamond particle dispersed metal matrix composites (MMCs) were fabricated by spark plasma sintering (SPS) in order to provide high performance thermal management materials. In the case of Al matrix composites, the samples were consolidated in continuous solid-liquid co-existent state by SPS process from the mixture of diamond powders, pure Al powders and Al-5mass%Si alloy powders. the microstructures and thermal conductivities of the composites obtained were examined. These composites were all well densified by heating at a temperature range between 798K and 876K for 1.56ks during SPS process. No reaction at the interface between the diamond particle and the Al matrix was observed by scanning electron microscopy for the composites fabricated under the sintering condition employed in this study. The relative packing density values of the diamond–Al composites obtained were 99% or higher in a volume fraction range of diamond between 45vol.% and 50cvol.%. Thermal conductivity of the diamond-Al composite containing 50vol.% diamond reached 552 W/mK, approximately 95% of the theoretical thermal conductivity estimated by using Maxwell-Euchen’s equation.

Densification of thermoelectric β-FeSi2 by directly applied current sintering process 招待 国際会議

Mikio Ito

Powder Metallurgy World Congress & Exhibition, World PM 2024  2024年10月  Japan Powder Metallurgy Association, Japan Society of Powder and Powder Metallurgy

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The thermoelectric β-FeSi2 powder, was sintered by modified pulsed electric current sintering (PECS) using graphite punches and an insulating quartz glass die. The sample powders were heated by directly applied current and their sintering behaviors were compared to those of the samples sintered by the conventional PECS (using graphite punches and a graphite die). During the heating in the quartz die, the transformation from mechanically alloyed metallic Fe-Si powder to the semiconductive β-FeSi2 phase occurred at a temperature lower than when sintered by the conventional PECS. After the transformation, the shrinkage of compact became larger than that of the sample sintered by the conventional method. The sample sintered by this modified PECS process showed the thermal conductivity smaller than the sample prepared in the conventional process because of its finer microstructure due to the rapid densification, resulting in lager figure of merit.

SPS装置を用いた直接通電による高効率焼結 招待

井藤幹夫

嶺南材料研究会  2021年12月  福井大学附属国際原子力工学研究所

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SPSを用いた新規な直接通電焼結プロセスを提案，導電性粉末の緻密化促進効果および省電力化効果など，これまでに得られた研究成果について報告した．

Thermoelectric properties of β-FeSi2 prepared by directly applied pulsed electric current sintering 招待 国際会議

Mikio Ito

Asia Pacific Society for Materials Research 2021 Annual Meeting (APSMR 2021 Annual Meeting)  2021年8月  APSMR 2021 Annual Meeting Committee

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As an electrically conductive powder, thermoelectric β-FeSi2 powder, was sintered by modified pulsed electric current sintering (PECS) using graphite punches and an insulating quartz glass die. These powders were heated by directly applied current and their sintering behaviors were compared to those of the samples sintered by the conventional PECS (using graphite punches and a garphite die). During the heating in the quartz die, the transformation from mechanically alloyed metallic Fe-Si powder to the semiconductive β-FeSi2 phase occurred at a temperature lower than when sintered by the conventional PECS. After the transformation, the shrinkage of compact became larger and the density of a sintered body was higher as compared to those of the sample sintered by the conventional method. The sample sintered by this modified PECS process showed the thermal conductivity smaller than the sample prepared in the conventional PECS process because of its finer microstructure due to the rapid densification. On the other hand, the electrical resistivity and the Seebeck coefficient of this sample were slightly reduced and enhanced, respectively, resulting in the significantly lager figure of merit as compared to the conventionally sintered sample.

直接通電焼結プロセスを用いた導電性粉末の高効率焼結

井藤幹夫

第24回通電焼結研究会 

Rapid and energy-saving densification of metallic and semiconducting powders by using directly applied current sintering 国際会議

Mikio Ito

The 4th International Conference on Functional Materials and Metallurgy (ICFMM 2019) 

Rapid densification of electrically conductive powders by Joule heating in directly applied current sintering 国際会議

Mikio Ito

The 8th International Conference on Nanostructures, Nanomaterials and Nanoengineering (ICNNN 2019) 

Preparation of heterogeneous β-FeSi2/Si composites synthesized by eutectoid decomposition and their thermoelectric properties 国際会議

Mikio Ito

International Conference on Material Science and Engineering. (Materials Science- 2019) 

Rapid and energy-saving sintering of electrically conductive powders by directly applied current heating 国際会議

Mikio Ito

2019 4th International Conference on Smart Materials Applications (ICSMA 2019) 

SPS成形したダイヤモンド粒子分散Cu基複合材料の放熱特性に及ぼすB添加の影響

水内　潔，井上漢龍，上利泰幸，田中基博，武内　孝，谷　淳一，川原正和，巻野勇喜雄，井藤幹夫

第23回通電焼結研究会 

Sintering of electrically conductive powders by directly applied current heating 国際会議

Mikio Ito

The International Conference on Nanostructures, Nanomaterials and Nanoengineering (ICNNN 2018) 

Effects of P doping on the thermoelectric performance of heterogeneous β-FeSi2/Si composites 国際会議

Mikio Ito, Fafah Liana, Masatoshi Takeda

The 9th International Conference on PROCESSIMG & MANUFACTURING OF ADVANCED MATERIALS (THERMEC 2018) 

Thermoelectric performance of heterogeneous β-FeSi2/Si composites synthesized by eutectoid decomposition 国際会議

Mikio Ito

The 2018 5th Global Conference on Polymer and Composite Materials (PCM 2018) 

Synthesis of thermoelectric materials by directly applied current sintering process 国際会議

Mikio Ito

The 8th International Conference on Key Engineering Materials (ICKEM 2018) 

共析変態を利用したβ-FeSi2/Siコンポジット材料の合成と熱電特性

井藤幹夫，ファラリアナ，武田雅敏

第22回通電焼結研究会 

Synthesis of thermoelectric β-FeSi2 via directly applied current sintering 国際会議

Mikio Ito

The 6th Global Conference on Materials Science and Engineering (CMSE 2017) 

Densification behavior and thermoelectric properties of β-FeSi2 synthesized by directly applied current sintering 国際会議

Mikio Ito

International Conference on Frontiers in Materials Processing Applications, Research and Technology, FiMPART’2017 

直接通電による高効率焼結プロセスの開発と熱電変換材料合成への応用

井藤幹夫

同志社大学先端複合材料研究センターコロキウム講演 

SPSを用いた直接通電による導電性粉末焼結体の合成

井藤幹夫

フォーラム「Manufacturing & Creative Knowledge Integration Yard (MACKIY)」 

直接通電焼結におけるβ-FeSi2粉末の焼結挙動

井藤幹夫

第21回通電焼結研究会