• Title, Summary, Keyword: Saffil fiber

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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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Characterization of the Ceramic Reinforced AC4C Matrix Composites Processed by Squeeze Casting (용탕단조법으로 제조된 AC4C 합금기 세라믹강화 복합재료의 특성연구)

  • Kim, Eok-Soo
    • Journal of Korea Foundry Society
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    • v.25 no.2
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    • pp.88-94
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    • 2005
  • The microstructure and mechanical property of the ceramic reinforced AC4C matrix composites processed by squeeze casting were investigated. In this study Kaowool and Saffil fiber which are ceramic reinforcements are used as preform materials. As a matrix material, Al-7wt.%Si-0.3wt.%Mg(AC4C) has been used. In case of Kaowool and Saffil/AC4C composites, 7.5 MPa squeezing pressure and minimum 7.0% binder amount are needed to produce sound composite materials. The tensile strength of Kaowool/ AC4C composite is lower than the matrix metal and this can be explained by the melt unfilling due to formed cluster of Kaowool reinforcements. But the mechanical properties of hardness, wear resistance and thermal expansion are better than the matrix materials due to the strengthening effect of ceramic reinforcements.

Effects of Reinforcements Type on Mechanical Properties of Metal Matrix Composites (보강재의 형태와 종류가 금속복합재료의 기계적 물성에 미치는 영향 연구)

  • 남현욱;조종인;한경섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.79-82
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    • 2001
  • In this research, tile effects of reinforcements type on mechanical properties of MMCs were studied. Six kinds preform were fabricated by using Saffil short fiber, HTZ short fiber, $Al_2O_3$ particle, and SiC particle. MMCs were fabricated by using squeeze casting methods. Various tests were conducted to show the effects of reinforcements type on mechanical properties of MMCs. Tensile and compressive properties of MMCs depend on short fiber, however wear properties depend on particle reinforcement. Generally, properties of fiber/particle hybrid MMCs were excellent than those of MMCs with short fiber.

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On the Wear Properties of the Alumina Short Fiber and Particle Reinforced Aluminium Bronze Alloy Composite (알루미나 단섬유 및 입자강화 알루미늄 청동기지 복합재의 마모특성)

  • 이상로;허무영
    • Tribology and Lubricants
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    • v.10 no.3
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    • pp.39-46
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    • 1994
  • In order to investigate the effect of the ceramic reinforcements on the wear properties of aluminum bronze composites, Cu-8wt%Al aluminum bronze alloys reinforced with the Saffil alumina short fiber were produced by the powder metallurgical method and tested by a pin-ondisc wear testing machine. The wear surfaces of the pin specimens and discs, wear debris, and the cross sections of the wear specimens were observed by SEM. The wear mechanism according to various wear conditions and the change of microstructure in the composites were also discussed. In the results, the reinforcement of the composites with alumina short fiber was very effective at the higher applied load over 10N. The material transportation to the counter disc was observed in the alloy specimens without reinforcements. However, the composites reinforced with ceramic particles and fibers showed the resistance against the material transportation.

A Study on Infiltration Limits in Forming Process of Metal Matrix Composites by Squeeze Casting (용탕단조법에 의한 금속복합재료의 성형공정에 있어서 함침한계성에 관한 연구)

  • Kang, C.C.;Ku, G.S.
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.7
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    • pp.1751-1760
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    • 1993
  • The squeeze casting process is considered as an attractive way to form the primary product of near net shape metal matrix composites for wide use in automobile industry. To understand for infiltration limit in squeeze casting processes, the SAFFIL short fiber preform of volume fraction $10%{\sim}23%$ were fabricated by vaccum pumping and speed control press, and the optimal condition for fiber preform fabrication had been experimentally obtained. The composite materials were fabricated by forced infiltration of molten metals such as Al6061, Al7075, pure Al, AC8A, and Al2024. The infiltration distance and deformation of fiber preform are observed, and tensile strength were measured from at the room temperature.

Preform Deformation and Fiber Heat-Treatment Effect in Squeeze Cast $Al/Al_2O_3$ Metal Matrix Composites (용탕단조한 $Al/Al_2O_3$ 복합재료에서의 예비성형체 변형 및 섬유열처리 영향)

  • Ji, Dong-Chul;Jung, Sung-Sill;Cho, Kyung-Mok;Park, Ik-Min;Kim, Jin
    • Journal of Korea Foundry Society
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    • v.13 no.1
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    • pp.62-70
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    • 1993
  • This study presents the effect of applied pressure on the preform deformation during squeeze casting of $Al_2O_3$ short fiber reinforced aluminum alloy (AC8A) metal matrix composites. A preliminary model based on the general beam theory is suggested for the prediction of the preform deformation. Two different commercially available $Al_2O_3$ short fiber (Saffil, Kaowool) were used to study the influence of the fibers on the microstructure and mechanical properties of the squeeze cast $Al/Al_2O_3$ composites. The composites were fabricated with the applied pressure of 75 MPa which was found to be the optimum condition for the squeeze casting of the composites in this study. For the amorphous Kaowool fiber, hard crystalline Mullite phase was formed with heat treatment. Both of amorphous and the crystallized Kaowool fibers were used to fabricate $Al/Al_2O_3$ composites. Microhardness of crystallized Kaowool fiber revealed higher than that of the amorphous Kaowool fiber in the squeeze cast composites. It was also found that the wear resistance of Kaowool fiber reinforced composites increased with the amount of Mullite.

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Cyclic Deformation and Fatigue Behavior of Short Fiber Reinforced Metal Matrix Composites (단섬유보강 금속복합재료의 반복적 변형 및 피로특성)

  • 양유창;송정일;한경섭
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.6
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    • pp.1422-1430
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    • 1995
  • Al6061 alloy reinforced with 15 volume% of Saffil fibers was fabricated by squeeze infiltration method. Uniform distribution of reinforcements and good bondings between reinforcements and matrix alloy were found in the microstructure of composites. Comparing with A16061 matrix alloy, tensile strength and elastic modulus of $Al_{2}$O$_{3}$/Al composites were increased up to 26% and 31%, respectively. Cyclic deformation and fatigue behavior of $Al_{2}$O$_{3}$/Al metal matrix composites were studied. The specimens were cycled using tension-tension(R=0.1) loading and under load controlled fatigue test. Cyclic stress-displacement curve through fatigue test was obtained. Fatigue strength of $Al_{2}$O$_{3}$/Al composites was about 200 MPa, i.e.0.55 of applied stress level(q). During fatigue test, $Al_{2}$O$_{3}$/Al composites displayed cyclic hardening at all applied stress levels. The most of resultant displacement due to permanent plastic deformation occurred in less than the first 5% of fatigue life. Displacement-to-failure of the fatigue test was smaller than that of the tensile test because of accumulative damage by cumulative plastic deformation.