Synthesis method for amorphous metallic foam
Synthesis method for amorphous metallic foam
复制标题
非晶态金属泡沫的合成方法
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
W. Johnson
中科院分区：
文献类型：
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作者：
J. Schroers;Chris Veazey;M. Demetriou;W. Johnson
介绍了一种制备非晶态泡沫金属的合成方法。该方法利用过冷液态的热力学稳定性和热塑性可成形性来生产尺寸不限于临界铸造厚度的低密度无定形金属泡沫。该方法由三个阶段组成：预发泡阶段，其中在压力下在平衡液体中产生大量小气泡;骤冷阶段，其中将液体预发泡体骤冷至其无定形状态;泡沫膨胀阶段，其中将无定形预发泡体再加热至过冷液体区域，并在显著低于预发泡步骤中施加的压力的压力下进行处理。从一个动态模型的结果表明，泡沫膨胀过程是可行的，因为在过冷液体区域的气泡膨胀动力学比结晶动力学快。在所提出的合成方法，散装无定形泡沫产品，其特征在于高达85%的气泡体积分数成功地生产。
A synthesis method for the production of amorphous metallic foam is introduced. This method utilizes the thermodynamic stability and thermoplastic formability of the supercooled liquid state to produce low-density amorphous metallic foams in dimensions that are not limited to the critical casting thickness. The method consists of three stages: the prefoaming stage, in which a large number of small bubbles are created in the equilibrium liquid under pressure; the quenching stage, in which the liquid prefoam is quenched to its amorphous state; the foam expansion stage, in which the amorphous prefoam is reheated to the supercooled liquid region and is processed under pressures substantially lower than those applied in the prefoaming step. Results from a dynamic model suggest that the foam expansion process is feasible, as the kinetics of bubble expansion in the supercooled liquid region are faster than the kinetics of crystallization. Within the proposed synthesis method, bulk amorphous foam products characterized by bubble volume fractions of as high as 85% are successfully produced.