• Title/Summary/Keyword: Composite Casting

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Characterization of TiC/Mg Composites Fabricated by in-situ Self-propagating High-temperature Synthesis followed by Stir Casting Process (자전연소합성법 및 교반주조 공정으로 제조된 TiC/Mg 금속복합재료의 특성연구)

  • Lee, Eunkyung;Jo, Ilguk
    • Composites Research
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    • v.33 no.5
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    • pp.256-261
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    • 2020
  • In this study, the ignition temperature of the Al-Ti-C reaction system, the microstructure and the mechanical properties of the TiC/Mg composite which produced by the self-propagating high-temperature synthesis (SHS) followed by stir casting process were investigated. Mg based composite with uniformly dispersed 0, 10, 20, and 30 vol.% TiC were fabricated, and higher volume fraction of TiC reinforced composite showed superior compressive strength and wear resistance as compared with Mg matrix. It is attributed to the less contamination, defects, impurities in TiC/Mg composite by the in-situ SHS yield effective load transfer from the matrix to the reinforcement.

Preparation and characterization of PVDF/TiO2 composite ultrafiltration membranes using mixed solvents

  • Tavakolmoghadam, Maryam;Mohammadi, Toraj;Hemmati, Mahmood
    • Membrane and Water Treatment
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    • v.7 no.5
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    • pp.377-401
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    • 2016
  • To study the effect of titanium dioxide ($TiO_2$) nanoparticles on membrane performance and structure and to explore possible improvement of using mixed solvents in the casting solution, composite polyvinylidene fluoride (PVDF) ultrafiltration membranes were prepared via immersion precipitation method using a mixture of two solvents triethyl phosphate (TEP) and dimethylacetamide (DMAc) and addition of $TiO_2$ nanoparticles. Properties of the neat and composite membranes were characterized using scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), Atomic force microscopy (AFM) and contact angle and membrane porosity measurements. The neat and composite membranes were further investigated in terms of BSA rejection and flux decline in cross flow filtration experiments. Following hydrophilicity improvement of the PVDF membrane by addition of 0.25 wt.% $TiO_2$, (from $70.53^{\circ}$ to $60.5^{\circ}$) degree of flux decline due to irreversible fouling resistance of the composite membrane reduced significantly and the flux recovery ratio (FRR) of 96.85% was obtained. The results showed that using mixed solvents (DMAc/TEP) with lower content of $TiO_2$ nanoparticles (0.25 wt.%) affected the sedimentation rate of nanoparticles and consequently the distribution of nanoparticles in the casting solution and membrane formation which influenced the properties of the ultimate composite membranes.

Interfacial and Tensile Properties of TiNi Shape Memory Alloy reinforced 6061 Al Smart Composites by vacuum casting (진공주조법에 의한 TiNi 형상기억합금 강화 6061Al 지적 복합재료의 계면 및 인장 특성)

  • Park, Gwang-Hun;Park, Seong-Gi;Sin, Sun-Gi;Park, Yeong-Cheol;Lee, Gyu-Chang;Lee, Jun-Hui
    • Korean Journal of Materials Research
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    • v.11 no.12
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    • pp.1057-1062
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    • 2001
  • We investigated the change of mechanical properties for TiNi shape memory alloy by heat treatment. 6061Al matrix composites with TiNi shape memory alloy as reinforcement were fabricated by vacuum casting. TiNi alloy has the maximum tensile strength at 673K treated and there is no change of tensile strength and hardness at 448K treated. The composites, prepared by vacuum casting, showed good interface bonding by vacuum casting. It was about 3$\mu\textrm{m}$ of thickness of the diffusion layer. Tensile strength of the composite was in higher than that of 6061Al alloy as increased value of about 70MPa at room temperature and about 110MPa at 363K. We thought that the increase of the tensile strength at 363K was due to reverse transformation of the TiNi shape memory alloy.

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Properties Evaluation on Aluminum for Die-casting(ADC 12) to Packing Case of Composite Sensor (복합센서 케이스용 알루미늄 다이캐스팅(ADC 12) 합금의 특성평가)

  • Son, Jae-Hwan;Oh, Sang-Kyun;Kim, Dong-Bae;Han, Chang-Woo
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.2
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    • pp.141-145
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    • 2006
  • In case of sense case manufactured by method of outage capacity, sensitivity is declined by outside effect and method of the photo electricity has a problem in transmission. therefore, packing case of composite sense should be developed to improve such a problem about influence of outside environment and its property evaluation has been performed. Mechanical property and result of analysis & test evaluation of Mat'l on aluminum die-casting(ADC 12type) Mat'l developed are as following. Tensile test piece, No. 4 of KS B 0801, has been applied to mechanical property test of Mat'l and It has been tested by method of metal mat'l tensile test(KS B 0802 : 2003). It can be found that physical property to KS(Korea Standard) is excellent. and homogeneous mechanical property appears. Test of Mat'l analysis has been performed by using OE Spectrometer, according to ASTM E 1251 : 1994 regulation. Consequently, good and homogeneous component contents classified by element to standard, except for Fe, have been obtained with coordination of Fe content as below 1.3% from composition standard of Aluminum Die-casting.

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Mechanical and wear properties evaluation of Al/Al2O3 composites fabricated by combined compo-casting and WARB process

  • Vini, Mohamad Heydari;Daneshmand, Saeed
    • Advances in Computational Design
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    • v.7 no.2
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    • pp.129-137
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    • 2022
  • Compo-casting method is one of the popular technique to produce metal based matrix composites. But, one of the main challenges in this process is un-uniform spreading of reinforced subdivisions (particles) inside the metallic matrix and the lack of desirable mechanical properties of the final produced composites due to the low bonding strength among the metal matrix and reinforcement particles. To remove these difficulties and to promote the mechanical properties of these kind of composites, the WARM ARB technique was utilized as supplementary technique to heighten the mechanical and microstructural evolution of the casted Al/Al2O3 composite strips. The microstructure evolution and mechanical properties of these composites have been considered versus different WARM ARB cycles by tensile test, average Vickers micro hardness test, wear test and scanning electron microscopy (SEM). The SEM results revealed that during the higher warm- ARB cycles, big alumina clusters are broken and make a uniform distribution of alumina particles. It was shown that cumulating the forming cycles improved the mechanical properties of composites. In general, combined compo-casting and ARB process would consent making Al/Al2O3 composites with high consistency, good microstructural and mechanical properties.

Fabrication and Analytical Characterization of 2-D Braided Textile Metal Matrix Composites (2-D Braided Textile 금속복합재료의 성형과 특성 해석)

  • 이상관;김효준;변준형;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.38-41
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    • 2001
  • A new 2-D braided textile metal matrix composite was developed and characterized. The constituent materials consist of PAN type carbon fiber as reinforcements and pure aluminum as matrices. The braided preforms of different braider yarn angles were fabricated. For a fixed bundle size of 12K, three braider yarn angles was selected: $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$. The braided preforms were infiltrated with pure Al by vacuum assisted squeeze casting. Through the investigation of melt pressing methods and the effects of process parameters such as applied pressure, and pouring temperature, the optimal process conditions were identified as follows: applied pressure of 60MPa, pouring temperature of $800^{\circ}C$. Using the measured geometric parameters, 3-D engineering constants of metal matrix composites have been determined from the elastic model, which utilizes the coordinate transformation and the averaging of stiffened and compliance constants based upon the volume of each reinforcement and matrix material.

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Fatigue Strength Characteristic of Metal Matrix Composite Material in $9Al_2\;.\;2B_2O_4$/ AC4CH ($9Al_2\;.\;2B_2O_4$/ AC4CH 금속기 복합재료의 피로강도 특성)

  • Park, Won-Jo;Lee, Kwang-Young;Huh, Sun-Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.10
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    • pp.1583-1589
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    • 2001
  • Metal matrix composites with whisker reinforcements have significant potentials for demanding mechanical applications including defense, aerospace, and automotive industries. Especially metal matrix composites, which are reinforced with aluminum borate whisker, have been used leer the part of piston head in automobile because of good specific strength and wear resistance. In this study, AC4CH-based metal matrix composites with $Al_{18}$B$_{4}$ $O_{33}$ reinforcement have been produced using squeeze casting method, after T6 heat treatment, we evaluated fatigue life property of matrix and MMC composite and investigated fracture mechanism.m.

Effect of Silicon Nitride Whisker Content on the Flexural Strength of Silicon Nitride-Boron Nitride-Silicon Carbide Multi-Layer Composites

  • Park, Dong-Soo;Cho, Byung-Wook
    • Journal of the Korean Ceramic Society
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    • v.40 no.9
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    • pp.832-836
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    • 2003
  • Multi-layer ceramic composites were prepared by tape casting followed by hot pressing using silicon nitride layer with silicon nitride whiskers, silicon nitride layer with silicon carbide particles and boron nitride-alumina layer. The whiskers were aligned during the casting. As the whisker content of the silicon nitride layer was increased up to 10 wt%, the flexural strength of the multi-layer composite was increased. However, further increase of the whisker content in the layer resulted in a rapid decrease of the strength of the composite. The results suggest that the strength of multi-layer ceramic composite showing non-catastrophic failure behavior can be significantly improved by incorporating the aligned whiskers in the layers.

Interface slip of post-tensioned concrete beams with stage construction: Experimental and FE study

  • Low, Hin Foo;Kong, Sih Ying;Kong, Daniel;Paul, Suvash Chandra
    • Computers and Concrete
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    • v.24 no.2
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    • pp.173-183
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    • 2019
  • This study presents experimental and numerical results of prestressed concrete composite beams with different casting and stressing sequence. The beams were tested under three-point bending and it was found that prestressed concrete composite beams could not achieve monolith behavior due to interface slippage between two layers. The initial stress distribution due to different construction sequence has little effect on the maximum load of composite beams. The multi-step FE analyses could simulate different casting and stressing sequence thus correctly capturing the initial stress distribution induced by staged construction. Three contact algorithms were considered for interaction between concrete layers in the FE models namely tie constraint, cohesive contact and surface-to-surface contact. It was found that both cohesive contact and surface-to-surface contact could simulate the interface slip even though each algorithm considers different shear transfer mechanism. The use of surface-to-surface contact for beams with more than 2 layers of concrete is not recommended as it underestimates the maximum load in this study.

Preparation and Characterization of Flexible Optical Composite Films Based on Bragg-Structured Interferometer

  • Um, Sungyong;Sohn, Honglae
    • Journal of Integrative Natural Science
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    • v.6 no.4
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    • pp.244-250
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    • 2013
  • Three types of functionalized flexible optical composite films based on Bragg structure porous silicon interferometer have been successfully fabricated by casting a toluene solution of polystyrene onto the free-standing porous silicon. The optical properties of composite films are measured. Surface functionalization of porous silicon is determined by FT-IR measurement. Reflectance and transparence properties of composite films are measured for the possible application of tunable optical filter and indicate that the transmission peak occurred at the identical location where the reflection peak appeared.