Reactive synthesis and assessment of porous Fe-20.5Al-18Cr intermetallic material: A comparative study with porous FeCrAl material produced from prealloyed powders
Reactive synthesis and assessment of porous Fe-20.5Al-18Cr intermetallic material: A comparative study with porous FeCrAl material produced from prealloyed powders
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多孔 Fe-20.5Al-18Cr 金属间材料的反应合成和评估：与预合金粉末制备的多孔 FeCrAl 材料的比较研究
DOI：
10.1016/j.seppur.2019.03.054
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发表时间：
2019
影响因子：
8.6
通讯作者：
Zheng Guoqu
中科院分区：
文献类型：
--
作者：
Zhang Huibin;Gao Haiyan;Liu Xinli;Yu Hang;Wang Longfei;Jiang Yao;Gao Lin;Yu Linping;He Yuehui;Chen Xiaoming;Zhang Lei;Zheng Guoqu
B2结构Fe-20.5Al-18 Cr（wt.%）以Fe/Al/Cr混合粉末为原料，采用反应合成法制备了高温煤气净化用金属间化合物过滤材料。该方法解决了高铝含量多孔Fe-Al-Cr材料制备中存在的问题，使生产更加方便、灵活和可控。系统研究了反应合成多孔Fe-20.5Al-18 Cr过程中的放热效应、体积膨胀、孔隙形成和扩散反应。同时与用预合金粉末制备的多孔Fe 20 Cr 7Al材料进行了对比研究。结果表明，Fe-20. 5Al-18 Cr压坯在烧结过程中表现出有限的放热行为和明显的体积膨胀，最终烧结后，通过Fe/Al/Cr粉末间的相互作用可以获得丰富的孔隙和成分均匀化。与烧结Fe-20.5Al-18 Cr多孔材料相比，多孔Fe-20.5Al-18 Cr材料具有更大的渗透系数和更低的氧化和硫化速率。中试过滤试验表明，Fe-20. 5Al-18 Cr过滤材料能够在含H2S和碱金属氧化物的高温煤气中稳定运行1000 h。
B2-structured Fe-20.5Al-18Cr (wt.%) intermetallic filter material developed for high-temperature coal-gas purification was fabricated by reactive synthesis using blended Fe/Al/Cr powders. This method addresses the problems presented in the manufacture of porous Fe-Al-Cr materials with high content of Al, making the production more convenient, flexible and controllable. The exothermic effect, volume swelling, pore formation and diffusion reactions during the reactive synthesis of porous Fe-20.5Al-18Cr were investigated systematically. A comparative study with porous Fe20Cr7Al material produced from prealloyed powders was carried out synchronously. The results show that during sintering the Fe-20.5Al-18Cr compact presents limited exothermic behavior and obvious volume expansion, and that the abundant pores and compositional homogenization can be obtained through the interactions of Fe/Al/Cr powders after final sintering. As compared with sintered Fe20Cr7Al porous material, porous Fe-20.5Al-18Cr possesses bigger permeability constants and lower oxidation and sulfidation rates. Pilot-scale filtration tests reveal that Fe-20.5Al-18Cr filter material can robustly serve in the corrosive H2S-contained and alkali-metals-oxides-loaded high-temperature coal gas during a period of 1000 h.