• Title, Summary, Keyword: pressure infiltration casting process

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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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    • 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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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.

Effect of the Holding Temperature and Vacuum Pressure for the Open Cell Mg Alloy Foams

  • Yue, Xue-Zheng;Hur, Bo-Young
    • Korean Journal of Materials Research
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    • v.22 no.6
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    • pp.309-315
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    • 2012
  • Metal foam has many excellent properties, such as light weight, incombustibility, good thermal insulation, sound absorption, energy absorption, and environmental friendliness. It has two types of macrostructure, a closed-cell foam with sealed pores and an open-cell foam with open pores. The open-cell foam has a complex macrostructure consisting of an interconnected network. It can be exploited as a degradable biomaterial and a heat exchanger material. In this paper, open cell Mg alloy foams have been produced by infiltrating molten Mg alloy into porous pre-forms, where granules facilitate porous material. The granules have suitable strength and excellent thermal stability. They are also inexpensive and easily move out from open-cell foamed Mg-Al alloy materials. When the melt casting process used an inert gas, the molten magnesium igniting is resolved easily. The effects of the preheating temperature of the filler particle mould, negative pressure, and granule size on the fluidity of the open cell Mg alloy foam were investigated. With the increased infiltration pressure, preheat temperature and granule sizes during casting process, the molten AZ31 alloy was high fluidity. The optimum casting temperature, preheating temperature of the filler particle mould, and negative pressure were $750^{\circ}C$, $400-500^{\circ}C$, and 5000-6000 Pa, respectively, At these conditions the AZ31 alloy had good fluidity and castability with the longest infiltration length, fewer defects, and a uniform pore structure.

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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    • 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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Fabrication Process and Analysis of Thermal Properties of High Volume Fraction SiCpi/Al Metal Matrix Composites for Heatsink Materials (반도체 heatsink용 고부피분율 SiCp/Al 금속복합재료의 제조공정 및 열적특성분석)

  • 이효수;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.58-62
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    • 2000
  • The fabrication process and analysis of thermal properties of 50~76vo1% SiCp/Al metal matrix composites(MMCs) for heatsink materials in electronic packaging 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 10~6ppm1k. Specially, the thermal conductivity and CTE of 71vo1%SiCp/Al MMCs were ranged 115~156W/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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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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    • 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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Analysis of the Formation of Porosity and Segregation in $Al_2O_3/Al$ Composites by Squeeze Infiltration Method (가압함침법에 의한 $Al_2O_3/Al$ 복합재료의 기공 및 편석의 발생에 대한 분석연구)

  • Seo, Young-Ho;Lee, Hyoung-Kook
    • Journal of Korea Foundry Society
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    • v.21 no.3
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    • pp.163-178
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    • 2001
  • The squeeze infiltration process is potentially of considerable industrial importance. The performance enhancements resulting from incorporation of short alumina fiber into aluminum are well documented. These are particularly significant for certain automobile components. Aluminum matrix composite automotive parts, such as diesel engine pistons or engine blocks are produced using squeeze casting apparatus or pressure die-casting apparatus. But the solidification process gets complicated with manufacturing parameters and the factors for porosity formation have not fully understood yet. In this study the formation of porosity during squeeze infiltration has been studied experimentally to achieve an improved understanding of the squeeze infiltration process for manufacture of short-fiber-reinforced components, particularly the mechanism of porosity formation. Al-based MMCs produced under a range of conditions were examined metallographically and the porosity characterised;a kind of matrix, an initial temperature of melt, and a volume fraction of reinforcement. The densimetry and the microscopic image analysis were done to measure the amount of porosity. A correlation between manufacturing parameters and defects was investigated through these.

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Centrifugal Infiltration Process of Fibrous Tubular Preform by Al-Cu Alloy

  • Li, Yanhong;Wang, Kai;Su, Yongkang;Hu, Guoxin
    • Advanced Composite Materials
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    • v.18 no.4
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    • pp.381-394
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    • 2009
  • The kinetics of centrifugal infiltration of fibrous tubular preform is built theoretically, and simulations are conducted to study the effects of various casting conditions on infiltration kinetics and macrosegregation by combining with the energy, mass and kinetic equations. A similarity way is used to simplify the one-dimensional model and the parameter is ascertained by an iterative method. The results indicate that the increase of superheat, initial preform temperature, porosity tends to enlarge the remelting region and decrease copper solute concentration at the infiltration front. Higher angular velocity leads to smaller remelting region and solute concentration at the tip. The pressure in the infiltrated region increase significantly when the angular velocity is much higher, which requires a stronger preform. It is observed that the pressure distribution is mainly determined by the angular velocity, and the macrosegregation in the centrifugal casting is greatly dependent on the superheat of inlet metal matrix, initial temperature and porosity of the preform, and the angular velocity.

Fabrication and Characterization of Al Matrix Composites Reinforced with 3-D Orthogonal Carbon Textile Preforms (3차원 직조형 금속복합재료의 제조와 특성분석)

  • 이상관;변준형;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.188-191
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    • 2002
  • 3-D orthogonal woven carbon/Al composites were fabricated using a pressure infiltration casting method. Especially, to minimize geometrical deformation of fiber pattern and $Al_4C_3$ formation, the process parameters of the minimum pressurizing force, melting temperature, delay and holding time of molten aluminum pressurizing was optimized through the PC-controlled monitoring system. Resonant ultrasound spectroscopy (RUS) was utilized to measure the effective elastic constants of 3-D orthogonal woven carbon/Al composites. The CTE measurement was conducted using strain gages in a heating oven.

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