The threshold pressure of infiltration into fibrous preforms normal to the fibers’ axes

Infiltration characteristics of liquid AZ91D alloy into short carbon fiber preform

“…Visualization is frequently used to study the flow nature of fluid in porous preform at macro and micro levels [15,20] which bridges the gap between physical modeling and real flow phenomena. For this purpose, a measuring device for vacuum assistant pressure infiltration monitored by data acquisition system was designed.…”

“…In this method, series of experiments under different pressure need to be conducted in which the position of infiltration front can be obtained to relate the infiltration front with process parameters. The second method is that the infiltration depth can be indicated by pre-placed thermocouples in the preform through their rapid thermal response to the variation of ambient temperature, which was used to monitor the flow behavior of liquid alloy in the preform [15]. Another method used by Mortensen et al [24] is that a sensor was developed to measure the position of the liquid metal in the fibrous preform during the infiltration process.…”

“…A more quantitative understanding of the infiltration behavior would enable better selection of infiltration materials, surface preparation, and processing parameters so that processing practice may be optimized [14]. For different liquid infiltration process, much research work had also been conducted on the calculation of the threshold pressure for initiation of infiltration [15,16], modeling of the infiltration processes [17,18], flow behavior of melt in the fiber preform [19,20] and multiscale simulation of unsaturated flows [21]. However, these theoretical results are different for different experimental conditions and also do not match with experimental results quantitatively.…”

A pore-scale, two-phase numerical model for describing the infiltration behaviour of SiC p /Al composites

“…According to the context of different applications, many methods for describing infiltration behaviour in porous media have been derived from those models. Furthermore, they have been applied to determine and optimize other parameters [25,27,28], such as threshold pressure, imposed external pressure, the relation between mean length of infiltration and time, and threshold contact angle of spontaneous infiltration, which are important in the infiltration processes of such composites. Generally speaking, the methods based on capillarity and wetting conditions are relatively simple, and their analytical solutions can be obtained without using numerical techniques.…”

“…Over past decades, many methods and models for describing the infiltration behaviour of melt liquid through porous media reported in the literature have been developed extensively from both numerical [12,14,[20][21][22][23] and analytical [22,24,25] viewpoints. To the best of our knowledge, those methods describing the infiltration behaviour of liquid melt through porous media are discussed from simple to complex in this section.…”