Nanoporous NiAl Matrix Fabricated through Directional Solidification and Pulsed Electrochemical Dissolution
Nanoporous NiAl Matrix Fabricated through Directional Solidification and Pulsed Electrochemical Dissolution
复制标题
通过定向凝固和脉冲电化学溶解制备纳米多孔 NiAl 基体
DOI：
10.1149/2.0291709jes
复制
发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Cui, Kai
中科院分区：
文献类型：
--
作者：
Gao, Jianjun;Zhao, Zhilong;Cui, Kai
采用三电极脉冲电化学系统对定向凝固的NiAl-W伪二元共晶合金进行选择性腐蚀，去除W纤维相，得到纳米多孔NiAl基体。实验结果表明，醋酸铵溶液对钨相的溶解效果优于Na_2HPO_4-C_6H_8O_7缓冲溶液。在相同的溶解时间内，0.5V脉冲电位下的溶解速率远高于1.0V脉冲电位下的溶解速率。对于在0.5 V的脉冲电位下的极化，孔径是0.22 μ m的常数，并且溶解深度在溶解持续时间期间增加。脉冲电位为1.0V时，NiAl基体发生过溶解，导致孔隙增大。在8 ~ 15 μ m/s的凝固速度范围内，试样中连通孔的数量随凝固速度的增加而明显增加。(C)2017年电化学学会。All rights reserved.
Directionally solidified NiAl-W pseudobinary eutectic alloys were selectively etched using an electrochemical system of three electrodes with pulsed potentials to remove the W fibrous phase, and nanoporous NiAl matrix was obtained. Experimental results demonstrated that the ammonium acetate solution has better dissolving efficiency than Na2HPO4-C6H8O7 buffer solution in selectively dissolving the W phases. The dissolving rate at the pulsed potential of 0.5 V is much higher than that of 1.0 V in the same dissolving duration. For polarization at the pulsed potential of 0.5 V, the pore diameter is a constant of 0.22 mu m and the dissolving depth increases during the dissolving duration. Over-dissolving occurred at the pulsed potential of 1.0 V, led to the enlargement of the pores on the NiAl matrix. The number of connecting pores in the sample evidently increased with solidification speed from 8 mu m/s to 15 mu m/s. (C) 2017 The Electrochemical Society. All rights reserved.