Microstructure and infiltration kinetics of Si3N4/Al–Mg composites fabricated by pressureless infiltration
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Si3N4/ Al–Mg composites reinforced by ceramic interpenetrating network structure had been fabricated via pressureless infiltration technology. The matrix and the reinforcement phase, form an interconnected interpenetrating network structure. The Al–Mg/Si3N4 system exhibits an excellent wettability under moderate conditions. The increasing of Mg content (2–10 wt%) resulted in an increased amount of infiltration, once Mg content beyond 10 wt% has an adverse effect. Light chemical reaction occurs in the interface of Al–Mg/Si3N4 system and the reaction productions reduce the surface tension of melt and impulse the advance of infiltration. Infiltration temperature and infiltration time were the key parameters, which turn into the infiltration impetus. The appropriate infiltration temperature is 1050 °C and the corresponding infiltration time is 15 min, prolonging the infiltration time continuously has no significance.
KeywordsContact Angle Wettability Liquid Phase Sinter Light Chemical Reaction Wetting Angle
This work was supported by the Natural Science Foundation of Shandong Province (Y2006F03). Part of this research was done at the Institute of Materials Science Jinan University. The authors are owing a debt of gratitude to the technical staff of institutions for their help.