Experimental determination of threshold pressure and permeability based on equation-solving method for liquid metal infiltration processes

基于方程求解法确定液态金属浸渗工艺的临界浸渗压力与渗透性（英文）

A new method for determining two key parameters(threshold pressure and permeability)for fabricating metal matrix composites was proposed based on the equation-solving method.An infiltration experimental device was devised to measure the infiltration behavior precisely with controllable infiltration velocity.Two experiments with alloy Pb-Sn infiltrating into Al2O3 preform were conducted independently under two different pressures so as to get two different infiltration curves.Two sets of coefficients which are functions of threshold pressure and permeability can be obtained through curve fitting method.By solving the two-variable equation set,two unknown variables were determined.It is shown that the determined threshold pressure and permeability are very close to the calculated ones and are also verified by another independent infiltration experiment.The proposed method is also feasible to determine the key infiltration parameters for other metal matrix composite systems.

基于方程求解的原理提出确定金属基复合材料制备过程中2个关键参数(临界浸渗压力和渗透性)的新方法。设计浸渗速度可控的浸渗实验装置,用于准确测量合金液在多孔预制体中的浸渗行为,并以Pb-Sn合金在Al2O3预制体中的浸渗为例,在2组不同压力下进行浸渗实验测试,获得2组浸渗深度与浸渗时间的关系曲线,通过曲线拟合方式得到2组拟合参数,根据达西定律求解得到未知参数。结果表明,利用方程求解方法获得的临界浸渗压力和渗透性参数与理论报道值非常相近。此外,利用获得的参数预测其他压力作用下Pb-Sn合金在Al2O3预制体中的渗流行为,与实验结果吻合良好,由此验证该方法的可行性。该方法也可用于其他金属基复合材料系统临界浸渗压力与渗透性参数的测定。