Effect of Mg and Si on infiltration behavior of Al alloys pressureless infiltration into porous SiCp preforms |
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Authors: | Shu-bin Ren Xiao-yu Shen Xuan-hui Qu Xin-bo He |
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Institution: | (1) School of Advanced Materials Engineering, Kookmin University, Seoul, 136-702, Korea; |
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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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Keywords: | |
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