Abstract
The effect of Mg and Si additon to Al matrix on infiltration kinetics and rates of Al alloys pressureless infiltration into porous SiCp preform was investigated by observing the change of infiltration distance with time as the Al alloys infiltrate into SiCp preforms at different temperatures. The results show that infiltration of SiCp preforms by Al melt is a thermal activation process and there is an incubation period before the infiltration becomes stable. With the increase of Mg content in the Al alloys from 0wt% to 8wt%, the infiltration will become much easier, the incubation period becomes shorter and the infiltration rate is faster, but these effects are not obvious when the Mg content is higher than 8wt%. As for Si addition to the Al alloys, it has no obvious effect on the incubation period, but the infiltration rate increases markedly with the increase of Si content from 0wt% to 12wt% and the rate has no obvious change when the content is bigger than 12wt%. The effect of Mg and Si on the incubation period is related to the infiltration mechanism of Al pressureless infiltration into SiCp preforms and their impact on the infiltration rate is a combined result from viscosity and surface tension of Al melt and SiC-Al wetting ability.
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This work was financially supported by the National Natural Science Foundation of China (No.51004010) and the Research Fund for the Doctoral Program of Higher Education of China (No.20090006120022).
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Ren, Sb., Shen, Xy., Qu, Xh. et al. Effect of Mg and Si on infiltration behavior of Al alloys pressureless infiltration into porous SiCp preforms. Int J Miner Metall Mater 18, 703–708 (2011). https://doi.org/10.1007/s12613-011-0500-3
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DOI: https://doi.org/10.1007/s12613-011-0500-3