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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Melt infiltration of SiCp reinforced Al matrix composite by newly designed pressure infiltration technique
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Melt infiltration of SiCp reinforced Al matrix composite by newly designed pressure infiltration technique

机译：新设计的压力浸渗技术熔渗SiCp增强Al基复合材料

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摘要

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 microstructure 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 semi-solid 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.
机译：开发了新设计的压力渗透技术，以澄清熔融金属在固体网络中的流动，目的是获得特性材料，同时获得纯化的基质作为过滤金属。构造了一种实验装置，以控制固相和施加压力的变化部分的微观结构形态。通过使用氩气压力将样品Al-7重量％的Si-20体积％的SiCp挤压在半固态铝合金饼和氧化铝多孔介质的双层上。渗透率值由达西定律估算，以便了解熔融金属在半固态范围内通过固态网络的流动特性。发现渗透率随固体分数的增加而突然降低，并且由于两者之间的流动阻力的很大差异，深度和饼状过滤之间的过滤机理在固体分数为0.25附近发生了变化。由于固体颗粒的固结，施加压力的增加降低了渗透性。对于过滤器上的加压样品和过滤后的金属，SiCp含量分别高达38％和小于0.4％（取决于固体含量）。与原始复合材料样品相比，具有较高SiCp含量的加压样品显示出较低的磨损率和较高的硬度。

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