摘要
为制备性能优良的Al_(2)O_(3)/FeCrNi复合蜂窝载体材料,通过混料-炼料-挤压成型法,以FeCrNi合金粉末、Fe_(2)O_(3)粉末、Al粉末为原料制备了整体蜂窝材料,并将该材料于氩气保护下在1200℃原位反应烧结2 h获得了Al_(2)O_(3)/FeCrNi复合蜂窝载体材料。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、力学性能测试机对Al_(2)O_(3)/FeCrNi复合蜂窝载体材料的微观组织、相结构及力学性能进行分析。结果表明:经烧结后Al_(2)O_(3)/FeCrNi蜂窝基体组织为γ-Fe(NiCr),原位反应生成的Al_(2)O_(3)一部分以团聚的形态分布在基体晶粒间隙处,一部分以颗粒状弥散分布在基体中;当Al_(2)O_(3)的质量分数低于1.5%,Al_(2)O_(3)/FeCrNi复合蜂窝载体抗压强度能保持在30 MPa以上;但当Al_(2)O_(3)质量分数的超过1.5%,随着Al_(2)O_(3)含量的升高,蜂窝载体抗压强度快速下降;随着Al_(2)O_(3)质量分数的增加,Al_(2)O_(3)/FeCrNi复合蜂窝载体表面催化活性涂层负载率增大,表面附着性能提高;当Al_(2)O_(3)的质量分数为1.5%、烧结温度为1200℃时,Al_(2)O_(3)/FeCrNi复合蜂窝载体的抗压强度高达31.5 MPa,表面附着性强,与催化活性涂层结合牢固,综合性能优良。
In order to prepare the Al_(2)O_(3)/FeCrNi composite honeycomb carrier materials with excellent performance,FeCrNi alloy powder,Fe_(2)O_(3) powder,Al powder were used as raw materials,the monolithic honeycomb structure was formed by mixing powder,kneading and extruding,then in-situ reaction sintered at 1200℃for 2 h under the protection of argon gas,and Al_(2)O_(3)/FeCrNi composite honeycomb carrier materials was fabricated.With SEM,XRD and universal testing machine,the structure and mechanical property of Al_(2)O_(3)/FeCrNi composite honeycomb carrier materials were studied.The results show that the matrix of Al_(2)O_(3)/FeCrNi composite honeycomb isγ-Fe(NiCr)after sintering,the Al_(2)O_(3) formed by the in-situ reaction is distributed partly in the grain boundary of the matrix in the form of agglomeration,and partly in the matrix in a circular granular manner;while the mass fraction of Al_(2)O_(3) is lower than 1.5%,the compressive strength of Al_(2)O_(3)/FeCrNi composite honeycomb carrier is maintained above 30 MPa;while the mass fraction of Al_(2)O_(3) is higher than 1.5%,the compressive strength of honeycomb carrier decreases rapidly with the increase of Al_(2)O_(3) content;with the mass fraction of Al_(2)O_(3) increasing,the load rate of catalytic active coating on the surface of Al_(2)O_(3)/FeCrNi composite honeycomb carrier increases,and the performance of surface load is improved;while the mass fraction of Al_(2)O_(3) is 1.5%and the sintering temperature is at 1200℃,the compressive strength of Al_(2)O_(3)/FeCrNi composite honeycomb carrier is as high as 31.5 MPa,and it has strong surface adhesion,solid combination with catalytic active coating,and excellent comprehensive performance.
作者
郭建新
周芸
汪天尧
闫敬明
郭路
左孝青
GUO Jianxin;ZHOU Yun;WAMG Tianyao;YAN Jingming;GUO Lu;ZUO Xiaoqing(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第9期160-165,共6页
Materials Reports
基金
国家自然科学基金(51861020,51264024)。
