• Title/Summary/Keyword: low pressure infiltration

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Fabrication and Wear Property Evaluation for FeCrSi/AC8A Composite by Low-pressure Infiltration (저압함침법에 의한 FeCrSi/AC8A 복합재료의 제조와 마모특성 평가)

  • Song, Tae-Hoon;Lee, Hyun-Jun;Choi, Yong-Bum;Kim, Sung-Jin;Park, Won-Jo
    • Journal of Ocean Engineering and Technology
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    • v.22 no.5
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    • pp.106-111
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    • 2008
  • In this paper, study about property evaluation for the metal matrix composites fabricated by low pressure infiltration process. Aluminum alloy composite which is reinforced by Metal fiber preform was fabricated by low pressure casting process. Infiltration condition was changed the pressure infiltration time of 1 sec, 2 sec and 5 sec under a constant pressure of 0.4 MPa. The molten alloy completely infiltrated the FeCrSi metal perform regardless of the increase in the pressure acceleration time. The the porosity in the FeCrSi/AC8A composite was investigated. The porosity was reduced as the pressure acceleration time as shorter. The FeCrSi/AC8A composite was investigated the wear test for to know the relationship between Porosity and wear resistance. FeCrSi/AC8A composite at pressure acceleration time of 1sec is shown excellent wear resistance.

A STUDY ON THE TRIBOLOGICAL CHARACTERISTICS OF FeCrSi/A366.0 ALLOY COMPOSITES

  • Song, Tae-Hoon;Choi, Yong-Bum;Park, Sung-Ho;Huh, Sun-Chul;Park, Won-Jo
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.262-267
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    • 2007
  • In this paper, we study about wear properties for the metal matrix composites fabricated by low pressure infiltration process. Metal fiber preform reinforced aluminum alloy composite were fabricated by low pressure casting process under 0.4MPa. Infiltration condition was changed the pressure infiltration time of 1 s, 2 s and 5 s under a constant pressure of 0.4MPa. The molten alloy completely infiltrated the FeCrSi metal perform regardless of the increase in the pressure acceleration time. However, the infiltration time at the pressure acceleration time of 1s was shorter than at the pressure acceleration time of 2s or 5s. The FeCrSi/A366.0 composite was investigated the porosity. The porosity is reducing as the pressure acceleration time compared with the pressure acceleration time of 2s and 5s. The FeCrSi/A366.0 composites were investigated the wear resistance. FeCrSi/A366.0 composite at pressure acceleration time of 1s has excellent wear resistance.

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Fabrication Process and Characterization of High Thermal Conductivity-Low CTE SiCp/Al Metal Matrix Composites by Pressure Infiltration Casting Process (가압함침법에 의한 고열전도도-저열팽창계수 SiCp/Al 금속복합재료의 제조공정 및 특성평가)

  • 이효수;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 1999.11a
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    • pp.83-87
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    • 1999
  • The fabrication process and thermal properties of 50~71vol% SiCp/Al metal matrix composites (MMCs) were investigated. The 50~71vol% SiCp/Al MMCs fabricated by pressure infiltration casting process showed that thermal conductivities were 118~170W/mK and coefficient of thermal expansion (CTE) were 9.5~$6.5{\times}10^{-6}/K$. Specially, the thermal conductivity and CTE of 71vol%SiCp/Al MMCs were 115~156W/mK and 6~$7{\times}10^{-6}/K$. respectively, which showed a improved themal properties than the conventional electronic packaging materials such as ceramics and metals.

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Effect of Processing Parameters on the Densification of Carbon/Carbon Composite by Isothermal Low-Pressure Chemical Vapor Infiltration (등온 저압화학기상침투법에 의한 탄소/탄소 복합재료의 치밀화에 대한 제조공정변수의 영향)

  • Park, H.D.;Ahn, C.W.;Cho, K.;Yoon, B.Y.;Kim, K.S.
    • Korean Journal of Materials Research
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    • v.4 no.3
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    • pp.259-267
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    • 1994
  • The effect of processing parameters, temperature, gas concentration, gas flow rate and pressure, were studied on the densification of carbon/carbon composites using a Robust design method in isothermal low-pressure chemical vapor infiltration with a gas system of $C_3H_8-N_2$ After one time of isothermal low-pressure chemical vapor infiltrat.ion, the bulk density of carbon/carbon composites in creased up to 1-9% and apparent porosity of the composites decreased down to 20-50%. ANOVA analysis of the experiment.al data revealed that the important parameters of isothermal lowpressure chemical vapor infiltration were temperature, gas concentration and gas flnw rate. 'There was almost no ~ f f e c t on densification by pressure and interaction between each parameters. In t, he present experimental conditions, the highest bulk density was obtained at $1100^{\circ}C$ temperature, 100% $C_3H_8$, concentration, 100 SCCM flow rate and 5 torr pressure.

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Fabrication Process and Characterization of High Thermal Conductivity-Low CTE SiCp/Al Metal Matrix Composites for Electronic Packaging Applications (전자패키징용 고열전도도-저열팽창계수 SiCp/Al 금속복합재료의 제조공정 및 특성평가)

  • 이효수;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.04a
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    • pp.190-194
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    • 2000
  • The fabrication process and thermal properties of 50∼76vo1% SiCp/Al metal matrix composites (MMCs) were investigated. The 50∼76vo1% SiCp/Al MMCs fabricated by pressure infiltration casting process showed that thermal conductivities were 85∼170W/mK and coefficient of thermal expansion (CTE) were ranged 10∼6ppm/K. Specially, the thermal conductivity and CTE of 71vo1%SiCp/Al MMCs were ranged l15∼156W/mK and 6∼7ppm/K, respectively, which showed a improved thermal properties than the conventional electronic packaging materials such as ceramics and metals.

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Development of Carbon Nanofiber Reinforced Cu Matrix Composites Using Liquid Pressing Process (액상 성형 가압법을 이용한 탄소나노섬유 강화 Cu 기지 나노 복합재료 개발)

  • 이상관;김두현;엄문광;하동호;김상식
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.10a
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    • pp.50-53
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    • 2003
  • Carbon nannofiber reinforced Cu matrix composite has potential applications for electrically conducting materials having high strength and electrical conductivity. In this study, we have developed fabrication technology of the nanocomposites using a liquid pressing process. The process is to use the low pressure for infiltration of Cu melt into carbon nanofiber mat as the Cu melt is pressurized directly. The minimum pressure required for infiltration was calculated from force balance equation, permeability measurement and compaction behavior of carbon nanofiber. Also, the melting temperature and the holding time have been optimized.

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Thin Plate Fabrication and Characterization of Plain Woven Carbon / 6061 Al Composites (Plain woven carbon/6061Al 금속복합재료의 제조와 특성분석)

  • Chang Jae-Jun;Ha Dong-Ho;Eom Mun-Gwang;Lee Sang-kwan
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.250-253
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    • 2004
  • Emphasis has been placed on thin plate fabrication of plain woven carbon fabric reinforced Al matrix composites using liquid pressing process. The composite has potential applications for PDP rear plate. The process is to use the low pressure for infiltration of Al melt into plain woven carbon fabric as the Al melt is pressurized directly. The minimum pressure required for the infiltration was calculated from force balance equation, permeability measurements and compaction behavior of carbon fiber. Also, the melting temperature and the holding time have been optimized. In order to measure coefficient of thermal expansion (CTE) of the composites, the thermal strain measurement using strain gage was performed and the thermal conductivity of the composites was measured using laser flash method. The constituent materials of the composite are PAN type carbon fibers as reinforcements and 6061 Al alloys as matrices.

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Impact of Physical, Chemical and Biological Factors on Lily (Lilium longiflorum cv. Georgia) Pollen Growth and GUS Expression Via Agro-infiltration (물리적, 화학적, 생물적 요인에 의한 백합 (Lilium longiflorum cv. Georgia) 화분의 생장 및 Agro-Infiltration을 이용한 GUS 발현)

  • Park, Hee-Sung
    • Journal of Plant Biotechnology
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    • v.31 no.4
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    • pp.279-283
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    • 2004
  • To lily (Lilium longflorum cv. Georgia) pollen, impacts by some physical, chemical and biological factors were examined in respects of its growth and transient gene expression via agro-infiltration. Rolling movement in liquid medium or vacuum pressure during Agro-infiltration was regarded as a impact that should be minimized for normal pollen growth. Pollen growth was maintained well in relatively broad range of temperature (19 to 27$^{\circ}C$) or pH (5.0 to 8.0). Chemical factors such as cefotaxime (up to 300mg/L), acetosyringone (up to 800 $\mu$M) and syringealdehyde (up to 800 $\mu$M) did not show any harmful effects but kanamycin severely did even at concentration as low as 25mg/L in some cases. For GUS gene expression, acetosyringone at 200 to 400 $\mu$M slightly improved the efficiency while syringealdehyde did not. Brief agro-infiltration followed by 18 hr of co-incubation of pollen along with Agrobacterium was suggested as a condition basically required for the transient expression system using lily pollen regardless of the presence of acetosyringone.

Evaluation of Carbon Fiber distribution in Unidirectional CF/Al Composites by Two-Dimensional Spatial Distribution Method

  • Lee, Moonhee;Kim, Sungwon;Lee, Jongho;Hwang, SeungKuk;Lee, Sangpill;Sugio, Kenjiro;Sasaki, Gen
    • Journal of the Korean Society of Industry Convergence
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    • v.21 no.1
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    • pp.29-36
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    • 2018
  • Low pressure casting process for unidirectional carbon fiber reinforced aluminum (UD-CF/Al) composites which is an infiltration route of molten Al into porous UD-CF preform has been a cost-effective way to obtain metal matrix composites (MMCs) but, easy to cause non-uniform fiber distribution as CF clustering. Such clustered CFs have been a problem to decrease the density and thermal conductivity (TC) of composites, due to the existence of pores in the clustered area. To obtain high thermal performance composites for heat-sink application, the relationship between fiber distribution and porosity has to be clearly investigated. In this study, the CF distribution was evaluated with quantification approach by using two-dimensional spatial distribution method as local number 2-dimension (LN2D) analysis. Note that the CFs distribution in composites sensitively changed by sizes of Cu bridging particles between the CFs added in the UD-CF preform fabrication stage, and influenced on only $LN2D_{var}$ values.