• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.617-618
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• 2005

The main purpose of this study is to investigate the effect of gas pressure infiltration on microstructure. Continuous fiber reinforced Al matrix composite wire is produced by gas pressure infiltration process. With the increase of gas pressure, porosity and wettabillity was improved. No chemical reaction product was detected at the interface of $Al_2O_3$ and Al.

• Textile Coloration and Finishing
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• v.23 no.3
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• pp.195-200
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• 2011

Silicone-coated fabric were treated by oxygen low temperature plasma to improve the adhesion. The surface of silicone-coated fabric was modified with gaseous plasma of several discharge power in the presence of oxygen gas at 1Torr pressure. Oxygen plasma treatment introduces oxygen-containing functional groups and micro-pittings on the silicone-coated fabric surface. The treated fabrics with oxygen low temperature plasma were measured by contact angle analyzer and XPS(X-ray photoelectron spectroscopy), and interfacial adhesion was measured by T-peel test. The surface of fabric was investigated by SEM photographs. The chemical and physical modification of the surface wettabillity by plasma treatment can increase the adhesion.

• Journal of Korea Foundry Society
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• v.14 no.5
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• pp.455-463
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• 1994

Aluminum matrix composites reinforced by fine steel wires were fabricated by squeeze casting process. Preforms made of fine steel wires were prepared with different surface conditions, namely uncoated(TN), carbo-nitriding treated(TT), and brass coated(TA). Squeeze casting were performed under the pressure of $1500kg/cm^2$ for 3min. during solidification, and pouring temp. of the melt being $750^{\circ}C$ and the steel mold being preheated at $250^{\circ}C$. Microstructural characteristics were evaluated, particularly concerned with the effect of the surface conditions of the preforms. The results obtained from this study are like these. TN specimens show partially non-wetted regions, due to easy formation of oxides on the surface of the fine steel wires. TT specimens show no interfacial reaction between the steel wires and the aluminum alloy matrix, possibly due to the formation of carbo-nitrided zone on the surface of the steel wires. TA specimens show excellent wettabillity between the reinforced steel wires and the aluminum alloy matrix and very thin interfacial zone is formed between them. During the solution hardening treatment of TA specimens, thickness of the interfacial reaction zones were increased with the solution treating time. TA specimens show typical ductile fracture in tensile test, but TT specimens show brittle fracture possibly due to the formation of the brittle hard surface on the steel wires during carbo-nitriding treatments. TA specimens which were reinforced with 40 vol.% of the fine steel wires exhibit high tensile strength of $77.1kgf/mm^2$ and impact value of $8.1kgf-m/cm^2$.