Effect of Powder Size on Infiltration Height in Producing MgO Reinforced Al Matrix Composite by Vacuum Infiltration Method

R. Calin and R. Citak, "Effect of Powder Size on Infiltration Height in Producing MgO Reinforced Al Matrix Composite by Vacuum Infiltration Method", Materials Science Forum, Vols. 534-536, pp. 797-800, 2007

Online since:

January 2007

Authors:

Recep Calin, Ramazan Citak

Keywords:

Composite, Infiltration, MgO

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References

[1] Stefanescu, D. M., et al., Met. Trans. V 23 A, p.2326 (1988).

[2] Zhou, W., Hu, W., and Zhang, D., V 39, No 12, p.1743 (1998).

[3] Gedeon, S. A. And Tangerini, I., Mat. Sci. and Eng., A, 144, p.237, Elsevier Sequoia (1991).

[4] Buhrmaster, C. L., Clark, D. E. And Smart, U., J. Of Metals, p.44 (1988).

[5] Martinez,J. A., et al., Materials Letters, 57, p.4332 (2003).

[6] Elwahed, M., Asar, M., J. of Mat. Proc. Tech., 86, p.152 (1999).

[7] Candan, E., Atkinson, H. V. and Jones, H., Mat. Sci. and Eng. V 35, p.4955 (1993).

[8] Stephens, J. J., Lucas, J. P. and Hosking, F. M., Scr. Metal., V 22, p.28 (1988).

[9] Demir, A., Altinkok, N., Composites Science and Technology, 64, p.2067 ([2004) 500 µm 10µm 10µm.

Paper TitlePages

Interactions in Titanium Matrix Composites Reinforced by Titanium Compounds by Conventional PM Route

Authors: F. Romero, Vicente Amigó, M.D. Salvador, A. Vicente

Abstract: Titanium metal matrix composites were produced. The powder metallurgy route applied was a conventional route consisting of blending titanium matrix powder with different percentages of various titanium compounds, as reinforcement particles, followed by cold compaction in a uniaxial press with a floating matrix and a sintering process in a vacuum furnace. This work studied the different interactions between the titanium matrix and the various titanium compounds added. To evaluate these interactions microscopic techniques are used principally, optical and electronic microscopy, with EDX techniques. By microstructural analysis the reactivity between reinforcement and matrix particles was investigated, and any new phases that formed during the sintering process were evaluated. In addition, microhardness test were conducted to study the mechanical properties associated with the new phases, and to evaluate the relative strength or weakness of the interfacial zones.

817

Effects of the Deformed Volume and the Volume Fraction on the Local Deformation Behavior of W/Cu Composites

Authors: Sabbah Ataya, Marcus Korthäuer, Essam El Magd

Abstract: Copper reinforced by tungsten particles has high potential applications in the fields of electronics and electric contacts where high strength accompanied with good electrical conductivity is required. The effects of different scaling parameters (deformed volume, tungsten volume fraction and the tungsten particle size) affect the force needed for the machining of the W/Cu particle reinforced composites. W/Cu composites with different weight percentages of tungsten (80, 70 and 60 wt.%) were tested under compression loading. Different sizes of the compression specimens were tested; the specimen diameter DS was varied to be 1, 2, 4, 6 and 8 mm. The effect of the tungsten particle size was varied to be 10 and 30-m. The compression tests were done at strain rates of 0.1s-1. The experiments were carried out within a temperature range from 20 °C to 800°C. The mechanically tested specimens were metallographically investigated to determine the degree of deformation of the tungsten particles in different specimen geometries. A clear dependence of the flow stress on the volume of the deformed specimens and the tungsten volume fraction was found. This size effects were more obvious with increase of the tungsten volume fraction at lower temperatures. The metallographic investigation was helped to understand the observed size effect of the composites in relation to the volume fraction and the specimen size

1205

Microstructure Development and Properties of HSS-Based Self-Lubrication Composites

Authors: Yan Jun Wang, Bin Wang, Li Ying Yang, Shou Ren Wang

Abstract: High speed steel based ceramic preforms with three-dimensionally interpenetrated micropores were fabricated using the mixture of TiH2, CaCO3 and stearic acid as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preforms with Pb-Sn based solid lubricants to create almost fully dense self-lubrication composites. The microstructure and properties of HSS-based self-lubrication composites were investigated as a function of sintered porosity. A quantitative analysis of microstructure was correlated with crushing strength，microhardness and wear rate to understand the influence of pore size, shape and distribution on mechanical and tribological behavior. Crushing strength and microhardness decreased with an increase in porosity. Meanwhile the decrease in microhardness with increasing porosity was slightly. The friction coefficient of HSS-based self-lubrication composites decreased with increasing the volume fraction of lubricant due to the self-lubrication and unique micropore structure. Within the range of lubricant volume fraction from 0% to 14%, the wear rate of the composites decreased steadily with the increase of lubricant content in the composites. Micropore structure and lubricant volume fraction play an important role in determining wear resistance of the composites whereas the measured bulk properties seem to be of minor importance.

625

In Situ Fabrication and Microstucture of ZrB₂ Particles Reinforced Aluminum Matrix Composites

Authors: Zhu Rui, Yu Tao Zhao, Song Li Zhang, Zhi Hong Jia

Abstract: Abstract：Aluminum matrx composites reinforced by in situ ZrB2 particles are fabricated from A356-AlB-K2ZrF6 system via in-situ melt reaction method, and the morphologies, sizes and distributions of the in situ particles as well as the microstructures, mechanical mechanisms of the composites are investigated by XRD,SEM,TEM and tensile tests. The results indicate that the morphologies of the in situ particles are mainly with ball-shape, the sizes are in nanometer scale and the distributions in the matrix are uniform. The interfaces between the in situ particles and the aluminum matrix are net and no interfacial outgrowth is observed.

122

Effects of Particle Size of Copper on the Electrical Property and Hardness of Copper/Graphite/Carbon Fiber/Phenolic Resin Composites

Authors: Mi Dan Li, Yao Lu, Lu Lu Feng, Huan Niu, Ya Wen Kong

Abstract: Composites made from phenolic resin are filled with conductive filler mixtures containing copper powders, natural graphite powders and carbon fibers. They are fabricated by compression molding technique. The density, electrical conductivity and hardness of composite are analyzed to determine the influence of copper particle size on the physical, electrical and mechanical properties of composite. It is found that there is a marked dependence of the electrical conductivity and hardness on copper particle size. The hardness decreases with the decreasing of copper particle size. However the electrical conductivity increases with the decreasing of copper particle size. The decreasing of copper particle size from 75 µm to 48 µm promotes a considerable increase in electrical conductivity by about 427%. The increased continuous conductive metal networks could be the main reason for the increasing of electrical conductivity as copper particle size decreases. The results also show that composites containing copper particles of different sizes have the nearly same density.

120