Melt infiltration of SiCp reinforced Al matrix composite by newly designed pressure infiltration technique

作者：Nicom Nakornriab^*; Nomura Hiroyuki

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2006, 441(1-2): 97-105.

DOI：10.1016/j.msea.2006.08.100

• metal matrix composite
• semi-solid processing
• permeability
• melt infiltration
• wear rate
• hardness

Newly designed pressure infiltration technique was developed to clarify the molten metal flow through solid network, aiming to obtain property materials and, simultaneously, the purified matrix as a filtrated metal. An experimental apparatus was constructed to control the rnicrostructure morphology for varied fraction of solid and applied pressure. A sample, Al-7 wt.% Si-20 vol.% SiCp was squeezed on the double layers of semisolid aluminum alloy cake and alumina porous medium by using argon gas pressure. Permeability values were estimated by Darcy's law in order to know the molten metal flow characteristics through solid network in the semi-solid range. It was found that the permeability suddenly decreased with increasing fraction of solid, and filtration mechanism was changed between depth and cake filtration near fraction of solid 0.25 due to much difference of the flow resistance between the two. Increasing applied pressure decreased the permeability due to the consolidation of solid grains. For pressurized sample on the filter and filtrated metal, SiCp content became to as high as 38 and less than 0.4 in volume percentage depending on fraction of solid, respectively. The pressurized samples with high SiCp content showed low wear rate and high hardness, when compared with original composite sample.

• 出版日期2006-12-15