The role of Cr in the reactive synthesis of porous FeAlCr intermetallic compounds
The role of Cr in the reactive synthesis of porous FeAlCr intermetallic compounds
复制标题
Cr在多孔FeAlCr金属间化合物反应合成中的作用
DOI：
10.1016/j.matchemphys.2020.123013
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发表时间：
2020-07
影响因子：
4.6
通讯作者：
Jiang Yao
中科院分区：
文献类型：
--
作者：
Zhang Huibin;Gao Haiyan;Yu Hang;Wang Longfei;Liu Xinli;Ma Junliang;Zhang Ninghui;He Yuehui;Jiang Yao
采用元素粉末反应合成法制备了一系列Cr含量为5 ~ 20wt%的多孔FeAlCr金属间化合物。这些多孔FeAlCr材料对应于B2结构的FeAl金属间化合物（α2），这使它们区别于传统的FeCrAl固溶体合金（α1）多孔材料。系统研究了多孔FeAlCr材料的放热行为、相特征、孔结构和氧化行为随Cr含量的变化规律。结果表明，随着Cr含量的增加，合成过程中的放热显著降低，而体积膨胀率、孔径和开气孔率均成正比增加。样品尺寸和孔结构的线性变化归因于Al 4Cr相的优先生长。多孔FeAlCr材料在600 °C下的氧化行为符合抛物线-线性规律，其氧化增重速率远低于已报道的Ni基和Fe-Cr合金。本工作在一定程度上证明了高含量的Cr有利于多孔FeAlCr材料的可控合成和高温抗氧化性能。
This work prepared a series of porous FeAlCr intermetallic compounds with the Cr content ranging from 5 wt% to 20 wt% by a reactive synthesis method using element powders. These porous FeAlCr materials correspond to the B2-structured FeAl intermetallic (α2) that distinguishes them from the traditional FeCrAl solid-solution alloy (α1) porous materials. The exothermic behaviors, phase characteristics, pore structures and oxidation behaviors of porous FeAlCr with the variation of Cr content were systematically studied. The results showed that upon increasing the Cr content, the released heat during synthesis process was remarkably reduced, while the volume expansion, pore size and open porosity were increased in direct proportion. The linear changes in sample size and pore structure were ascribed to the preferential growth of Al4Cr phase. The oxidation behaviors of porous FeAlCr materials at 600 °C followed a parabolic-linear law, and their oxidation mass gain rates were much slower than those of other reported Ni-based and Fe–Cr alloys. This work proves that to a certain extent the high content of Cr is conducive to the controllable synthesis and high-temperature oxidation resistance of porous FeAlCr materials.
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