Wang Zhe, Gao Jintao, Chang Kuan, Meng Long, Zhang Ning, Guo Zhancheng
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing Beijing 100083 China
RSC Adv. 2018 Apr 30;8(29):15933-15939. doi: 10.1039/c7ra13689g. eCollection 2018 Apr 27.
Replicated open-cell aluminum foams were produced by infiltration casting in super-gravity fields. Infiltration of preforms packed by NaCl particles with different sizes was conducted to demonstrate the technical feasibility of this method. The relative densities between 0.25 and 0.34 of the aluminum foams were obtained by varying the NaCl particle size of the preform from 600 to 200 μm. Increasing the gravity coefficient () increased the centrifugal pressure ( ) and correspondingly improved the relative densities and structural integrity of the resulting foams. As increased, the aluminum foam exhibited a transition from a structure of smooth struts to a relatively complex structure where many protrusions extended inside the pores from the surface of the struts. Also, the specific relationship between the minimum centrifugal pressures necessary to produce self-standing aluminum foams and the NaCl particle size of the preform was established. The minimum centrifugal pressures of 32, 49 and 83 kPa were required for aluminum foams with pore sizes of 600, 400 and 200 μm, respectively. Preliminary results show that super-gravity infiltration is promising to be a practical manufacture process for replicated open-cell aluminum foams.
通过在超重力场中进行浸渗铸造制备了复制型开孔泡沫铝。对由不同尺寸氯化钠颗粒填充的预制件进行浸渗，以证明该方法的技术可行性。通过将预制件的氯化钠颗粒尺寸从600μm变化到200μm，获得了相对密度在0.25至0.34之间的泡沫铝。重力系数（）的增加会提高离心压力（），相应地提高了所得泡沫的相对密度和结构完整性。随着的增加，泡沫铝呈现出从光滑支柱结构向相对复杂结构的转变，在这种复杂结构中，许多突出物从支柱表面向孔内延伸。此外，还建立了制备自立式泡沫铝所需的最小离心压力与预制件氯化钠颗粒尺寸之间的具体关系。对于孔径为600、400和200μm的泡沫铝，所需的最小离心压力分别为32、49和83kPa。初步结果表明，超重力浸渗有望成为复制型开孔泡沫铝的一种实用制造工艺。
