Fabrication of Cr2AlC powder by molten salt electrolysis at 850 degrees C with good oxidation resistance
Fabrication of Cr2AlC powder by molten salt electrolysis at 850 degrees C with good oxidation resistance
复制标题
850℃熔盐电解制备Cr2AlC粉末具有良好的抗氧化性能
DOI：
10.1016/j.jallcom.2020.154003
复制
发表时间：
2020
影响因子：
6.2
通讯作者：
Hu Meilong
中科院分区：
文献类型：
--
作者：
Liu Pengjie;Hu Mengjun;Hu Liwen;Yin Mingzhu;Wu Hongfei;Hu Meilong
Cr2AlC是一种典型的三元金属间化合物，具有良好的耐高温氧性、优异的机械强度等独特性能，是在相对严格的条件下应用的潜在陶瓷候选材料。本文提出了一种简单、廉价的方法，即在850℃下电化学还原Cr2O3/Al2O3/C混合粉末，合成高质量、均匀的微米级Cr2AlC。结果表明，Cr2AlC是通过以下三个步骤形成的。首先，将cr2o3还原为金属Cr，与碳反应生成CrnCm。生成的crncm与还原氧化铝反应生成Cr2AlC。SEM-EDS图像证实了Cr、Al和C在微米级Cr2AlC粉末中的均匀分布。TEM和TG进一步证明了Cr2AlC粉末具有优异的层状结构和良好的抗氧化性。这项工作实现并提供了一种低成本和可扩展的低温技术来制备均匀的MAX相粉末用于商业应用。
The Cr2AlC is a typical ternary intermetallic who possesses unique properties such as good high temperature oxygen resistance, excellent mechanical strength, and so on, making it a potential ceramic candidate to be utilized under a relatively strict circumstance. In this paper, a straightforward and cheaper process was proposed to synthesize high quality and uniform micron-size Cr2AlC, via electrochemical reduction of Cr2O3/Al2O3/C mixed powder at only 850 °C. It is demonstrated that Cr2AlC was formed by the following three steps. Firstly, Cr2O3was reduced to metallic Cr and react with carbon to form CrnCm. Then formed CrnCmwill react with reduced alumina to form Cr2AlC. The SEM-EDS images confirmed the homogeneous distribution of Cr, Al and C in micron-size Cr2AlC powder. And the TEM and TG results further demonstrate the excellent layered structure and good oxidation resistance of Cr2AlC powder. This work realizes and provides a low-cost and scalable low temperature technique to prepare homogeneous MAX phase powders for commercial applications.