• Title/Summary/Keyword: powder composite

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Fabrication and Investigation of Composite Made of Graphite, SiC, Mullite and Aluminum

  • Motaman, A.;Amin, S.A.;Jahangir, A.
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1071-1074
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    • 2006
  • Fabrication and investigation of composite made of graphite, SiC, mullite and aluminum as the additive are the aim of this project. Aluminum acts as an anti-oxidant. SiC is a non-metallic anti-oxidant that increases composite strength. Different compositions with influent percents of aluminum have been selected to determine product specifications by XRD, SEM and STA methods. Results show that the composition of 40wt% graphite-20% SiC- 20% mullite-20% aluminum is a more robust and occurs at elevated temperatures than other graphite combustion composites.

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High-strength Soft Magnetic Composite with Self-lubricating Resin

  • Miyahara, Masahisa;Tanaka, Yoshihiro;Igarashi, Kazunori;Morimoto, Koichiro
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1173-1174
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    • 2006
  • Improvement of the strength is one of the most important subjects on soft magnetic composite (SMC) to increase the applica ble items. In this study, lubricants for inner lubricating SMC, which can be produced in lower cost than die wall-lubricatin g SMC, varied to investigate their effect on the strength. The newly developed SMC with self-lubricating resin shows high st rength equivalent to that of SMC obtained by die wall lubrication.

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A Study of Cooking Properties of the Noodle Made of Composite Flour with Green Tea Powder (녹차분말을 첨가한 국수의 조리 특성에 관한 연구)

  • 현영희;황윤경;이윤신
    • Journal of the East Asian Society of Dietary Life
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    • v.11 no.4
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    • pp.295-304
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    • 2001
  • This study was conducted to investigate the cooking properties of noodles made from composite flour blended with green tea powder. As the ratio of green tea powder increased, development time was longer than that of the control. The stability of dough showed higher value than the control except 2% addition group. The highest viscosity was at the 4% addition group. but 2% addition group showed the lowest viscosity. As the additional ratio of green tea powder was increased. the volume expansion ratio was increased, but water soluble solid matters contents in all addition groups had a lower level than that of the control. Also, the yellowness level of noodle was increased, but the brightness, redness and color and flavor acceptability was decreased, as the additional ratio was increased. However. 2~4% addition group of green tea powder had a similar acceptability profile to that of the control group.

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Composite copper powder from Kelex 100 (Kelex100로부터 구리입자 분말 합성)

  • ;P.R Taylor
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.8 no.1
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    • pp.131-137
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    • 1998
  • A composite copper coated powder was generated by pressure hydrogen stripping copper from Kelex 100 solvent extractant in the presence of silica powder. Within the limitation of solvent extraction under constant conditions, both loading level and stripping rate were reproducible. The stripping copper kinetics are reduced from a divalent state to a metallic state and then deposited on the surface of the silica powder. Copper nucleates heterogeneously on the seed particles. They are giving an agglomerated and non - uniform powder.

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Effect of ECAP on Microstructure of SiCw/6061Al Composites Produced by Powder Metallurgy (분말야금공정으로 제조한 SiCw/6061Al 복합재료의 미세조직에 미치는 ECAP가공의 영향)

  • Chang, Si-Young
    • Journal of Powder Materials
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    • v.9 no.1
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    • pp.11-18
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    • 2002
  • The 6061 Al alloy based composites reinforced with 10 vol% SiC whiskers were prepared by powder metallurgy with the powders having the different sizes, i.e. < $30{\mu}m$ and > $30{\mu}m$ The composites were subjected to equal channel angular pressing (ECAP) at various conditions and the microstructural changes during ECAP were examined In the composites SiC whiskers were clustered and randomly aligned. The clusters were relatively well distributed in the composite with the smaller initial powder size. After ECAP, the clusters were aligned parallel to flow direction and became smaller. In addition, the shape of clusters was changed from irregular to round. The microstructure of the ECAPed samples were compared with those of the conventionally hot-extruded composites. The uniform microstructure and enhanced microhardness could be obtained by using the powders having the smaller size, decreasing ECAP temperature and repeating ECAP.

Effect of Powder Synthesis Processing on the Microstructure and Electrical Conductivity of Sintered $CNTs/Fe/Al_2O_3$ Nanocomposites

  • Choa, Yong-Ho;Yoo, Seung-Hwa;Yang, Jae-Kyo;Park, Jin-Woo;Oh, Sung-Tag;Kang, Kae-Myung;Kang, Sung-Goon
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1087-1088
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    • 2006
  • The microstructure and electrical conductivity of CNTs dispersed $Al_2O_3$ nanocomposites depending on the powder processing and CNTs content were demonstrated. The composite powders with homogeneous dispersion of CNTs could be synthesized by a catalytic route for direct formation of CNTs on nano-sized Fe dispersed $Al_2O_3$ powders. The sintered nanocomposite using the composite powder with directly synthesized CNTs showed homogeneous microstructure and enhanced elelctrical conductivity. The influence of powder processing on the properties of sintered nanocomposites was discussed by the observed microstructural features.

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