• Title, Summary, Keyword: SiCp/Al MMCs

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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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    • 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 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 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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Wear Behavior of Saffil/SiCp reinforced Metal Matrix Composites at the room temperature (Saffil/SiCp을 이용한 금속 복합재료의 상온 마모 거동)

  • 조종인;한경섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.46-49
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    • 2003
  • Aluminum based metal matrix composites(MMCs) are well known for their high specific strength, stiffness and hardness. They are gaining further importance because of their high wear resistance. In this study, Al/Saffil-20%, Al/Saffil-5%/Al2O3(particle type)-15% and Al/Saffil-5%/SiC(particle type)-15% hybird MMCs' wear behavior were characterized by the pin-on-disk test under various normal load The superior wear resistance was exhibited at Al/Saffil-5%/SiC(particle type)-15% MMCs. And this MMCs' predominant wear mechanism is subsurface cracking in the low load wear regime. Others(Al/Saffil-20%, Al/Saffil-5%/Al2O3(particle type)-15%) showed the similar wear resistance with each other at the same test condition. In the low load & room temperature condition, the wear resistance was improved due to the high hardness of the ceramic reinforcements. As the test load increased, the wear properties were governed by the wear properties of matrix.

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Heat and Wear Resistance Characterization of SiCp Reinforced Al Matrix Composites (SiCp입자강화 Al 복합재료의 내열 및 마모특성)

  • Kim, Sug-Won;Kim, Wan-Ki;Woo, Kee-Do;Ahn, Haeng-Keun
    • Journal of Korea Foundry Society
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    • v.20 no.6
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    • pp.377-385
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    • 2000
  • Al matrix composites as the most promising MMCs can be expected to be excellent engineering materials in the nearest future. So as to improve material properties of composite, many manufacturing processes have been developed. Among them, squeeze casting process which offers fine microstructure and near-net-shape is one of the most successful MMCs manufacturing processes. But, in case of with subsieve size particles (under 44 ${\mu}m$), it is very difficult to homogeneously distribute particles in matrix of Al matrix composite by various casting processes, including squeeze casting used so far. Duplex process which was developed in previous study was used to distribute the particle of subsieve size more homogeneously in matrix of Al matrix composite. Microstructures, wear and heat resistance characterization of Al-Si-Cu-Mg-(Ni)/SiCp manufactured by duplex process were examined to clarify the effect of manufacturing conditions, particle size of reinforcement and alloying elements. Al matrix composites reinforced with SiCp(10 ${\mu}m$) have the lowest wear amount among composites reinforced with 3 ${\mu}m$, 5 ${\mu}m$ and 10 ${\mu}m$ SiCp. The wear amount of Al matrix composites with 10 wt.% SiCp(3, 5, 10 ${\mu}m$) was decreased according to the increase of the sliding speed because abrasive wear takes place at high sliding speed of 4m/s and worn debris with block type occurs at low sliding speed of 1m/s. As for heat resistance, it is made clear that remarkable heat resistance property can be obtained by addition of Ni element in Al matrix composites.

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A Study on the Microstructures and Properties of $Al-SiC)_p$ Metal Matrix Composites Fabricated by Spray Forming Process (분무성형법에 의해 제조된 $Al-SiC)_p$ 금속기 복합재료의 미세조직과 성질에 관한 연구)

  • 김춘근
    • Journal of Korean Powder Metallurgy Institute
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    • v.1 no.1
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    • pp.42-51
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    • 1994
  • 6061Al-SiCP metal matrix composite materials(MMCs) were fabricated by injecting SiCP particles directly into the atomized spray. The main attraction of this technique is the rapid fabrication of semi-finished, composite products in a combined atomization, particulate injection(10 $\mu\textrm{m}$, 40 $\mu\textrm{m}$, SiCP) and deposition operation. Conclusions obtained are as follows; The microstructure of the unreinforced spray formed 6061Al alloy consisted of relatively fine(50 $\mu\textrm{m}$) equiaxed grains. By comparision, the microstructure of the I/M materials was segregated and consisted of relatively coarse(150 $\mu\textrm{m}$) grains. The probability of clustering of SiCP particles in co-sprayed metal matrix composites increased it ceramic particle size(SiCP) was reduced and the volume fraction was held constant. Analysis of overspray powders collected from the spray atomization and deposition experiments indicated that morphology of powders were nearly spherical and degree of powders sphercity was deviated due to composite with SiCp particles. Interfacial bonding between matrix and ceramics was improved by heat treatment and addition of alloying elements(Mg). Maximum hardness values [Hv: 165 kg/mm2 for Al-10 $\mu\textrm{m}$ SiCp Hv--159 kg/mm2 for Al-40 $\mu\textrm{m}$SiCp] were obtained through the solution heat treatment at $530^{\circ}C$ for 2 hrs and aging at $178^{\circ}C$, and there by the resistance were improved.

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Fabrication of SiCp/Al Alloy Composites by In-situ Vacuum Hot Press Process (In-situ Vacuum Hot Press 공정을 이용한 SiCp/Al 복합재료의 제조)

  • Choe, Se-Won;Hong, Seong-Gil;Kim, Yeong-Man;Jang, Si-Yeong;Gang, Chang-Seok
    • Korean Journal of Materials Research
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    • v.11 no.7
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    • pp.590-598
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    • 2001
  • SiCp/pure Al and SiCp/2024Al MMCs were fabricated by in-situ VHP process designed specially just in this study which is composed of the vacuum hot press at range from R.T. to $500^{\circ}C$ and the continuous extrusion without canning process at $520^{\circ}C$. It was investigated the effect of SiC particle size, volume fraction and extrusion ratio on the tensile properties and micro structure in auf composites. In case of the 10:1 extrusion ratio, but SiCp/pure Al and SiCp/2024Al composites were shown a sound appearance and a good micro structure without crack of SiCp as well as uniform distribution of SiCp. However, in case of the 16:1 extrusion ratio, the number of cracked SiC particles more than increased in a higher volume fraction composite and 2024Al matrix composite compared with pure Al matrix one. The tensile strength of the composites reinforced smaller SiCp was higher than that of the bigger SiCp reinforced in same volume fraction and extrusion ratio.

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A Study on Ageing Characteristics and Alloy Elements of SiCp Reinforced Al Matrix Composites (SiCp입자강화 Al 복합재료에 대한 합금원소의 영향과 시효특성에 관한 연구)

  • Kim, Sug-Won;Lee, Ui-Jong;Woo, Kee-Do;Kim, Dong-Keun
    • Journal of Korea Foundry Society
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    • v.21 no.1
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    • pp.7-14
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    • 2001
  • The research on new DRA(discontinuous reinforced alloy) and CRA(continous reinforced alloy) composites has been carried out to improve the properties of ceramic fiber and particle reinforced metal matrix composites(MMCs). Effects of alloying elements and aging conditions on the microstructures and aging behavior of Al-Si-Cu-Mg-(Ni)-SiCp composite have been examined. The specimens used in this study were manufactured by duplex process. The first squeeze casting is the process to make precomposite and the second squeeze casting is the process to make final composite. The hardening behavior was accelerated with decreasing the size of SiCp particle in the composites. It is considered that the dislocation density increased with increasing SiCp size, due to the different thermal deformation between Al matrix and SiCp during quenching after the solution treatment. Peak aging time to obtain the maximum hardness in 3 ${\mu}m$ SiCp reinforced Al composite was reduced than that in large size(5, 10 ${\mu}m$) of SiCp because of difference in dislocation density. Aging hardening responce(${\Delta}H$ = $H_{Max}.-H_{S.T}$) of composites was greater than that of unreinforced Al alloy because of higher density of second phases in matrix.

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The Effect of SiCp Size on the Mechanical Preperties of ($\textrm{Al}_2\textrm{O}_3$+SiCp)/AZ91 Hybrid Mg Composites (($\textrm{Al}_2\textrm{O}_3$+SiCp)/AZ91 하이브리드 Mg 복합재료의 기계적 특성에 미치는 SiCp크기의 영향)

  • 하창식;김봉룡;조경목;박익민;최일동
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.29-33
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    • 2001
  • In the present study, AZ91Mg/$\textrm{Al}_2\textrm{O}_3$ short fiber+SiC particulates hybrid metal matrix composites(MMCs) were fabricated by squeeze casting method. Different particulate sizes of 45, 29 and $9\mu\textrm{m}$ were hybridized with 5% volume fraction to investigate the effect of SiC particulates size on microstructure, mechanical and thermal properties such as hardness, flexural strength, wear resistance and thermal expansion. Results show that the microstructure of the hybrid composites were quite satisfactory, namely revealing relatively uniform distribution of reinforcements. Some aggregation of SiC particulates caused by particle pushing was observed especially in the hybrid composites containing in fine particulates($9\mu\textrm{m}$). The hardness and flexural strength were improved by decreasing particulates size, whereas wear resistance improved by increasing particulates size because of large particulates restricting matrix wear from contacted stress. Regardless of particulates size, thermal expansion of composites was the same. This may be because the content of particulates was in all cases 5 volume fraction.1

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Evaluation of Dry Tribological Characteristics of Hybrid Metal Matrix Composites with Temperature Rising (온도 상승에 따른 혼합금속복합재료의 건식 마찰특성 평가)

  • Wang, Yi-Qi;Afsar, Ali-Md.;Song, Jung-Il
    • Composites Research
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    • v.23 no.2
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    • pp.10-16
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    • 2010
  • $Al_2O_3$ fiber and SiC particle hybrid metal matrix composites (MMCs) were manufactured by squeeze casting method investigated for their tribological properties. The pin specimens had different ratios of fiber to particle content but their total weight fraction was constant at 20 wt. %. Tribological tests were performed with a pin-on-disk friction and wear tester. The investigation of the dry tribological characteristics of hybrid MMCs were carried out at room temperature and elevated temperature of$100^{\circ}C$ and$150^{\circ}C$. The morphologies of worn surfaces were examined by scanning electron microscope (SEM) to observe tribological characteristics and investigate wear behavior. The results revealed that the wear resistance improved with the content of SiCp increased of the planar random (PR) MMCs at room temperature. At the elevated temperature, it revealed that the wear resistance of normal (N) MMCs was superior to that of the PR-MMCs due to PR-fibers were easily pulled out holistically from the worn surface. Meanwhile, the coefficient of friction decreased with the temperature increasing.