瓦楞形复层结构多孔铝过滤材料的制备、界面结构与性能  

Fabrication,interface structure and properties of porous aluminum filter material with dual-corrugated structure

作　　者：史金宏 郭建新 黄蓓 左孝青[1] 周芸[1] SHI Jinhong;GUO Jianxin;HUANG Bei;ZUO Xiaoqing;ZHOU Yun(Faculty of Materials Science and Engineering, Kunming University ofScience and Technology, Kunming 650093, China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《功能材料》2022年第6期6137-6144,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(51861020,51741103);云南省重大科技专项项目(2018ZE005-6)。

摘　　要：为实现常高温(200~250℃)工业烟气中微细固态颗粒的过滤,采用粉末增塑温压、伪半固态热压方法,制备了瓦楞形复层结构多孔铝过滤材料,并对其界面结构、性能(力学、过滤、常高温抗氧化)进行了研究。结果表明,瓦楞形复层结构的过滤层、支撑层孔径分别为20~25μm、40~45μm(A),以及1~10μm、19~48μm(B),孔隙率为50%~55%,层间微观形貌无明显分界,过滤层和支撑层实现了无缝连接,与胶合双层多孔铝平板相比,复层结构多孔铝平板屈服强度提高了31.58%。压差1.0~1.5 kPa时,两种瓦楞形复层结构多孔铝过滤材料的透气系数及过滤效率分别为(1.14~1.23)m^(3)/(h·kPa·m^(2))、86%,以及(0.95~1.13)m^(3)/(h·kPa·m^(2))、90%。瓦楞形复层结构多孔铝过滤材料250℃下的氧化速率为0.00735 mg/(cm^(2)·h),氧化64 h后氧化膜停止生长,生成的Al_(2)O_(3)增大了孔壁、孔径由20~25μm缩小到8~14μm,有利于进一步提升过滤效率与过滤精度。通过以上研究,获得了一种层间无缝连接、强度高、过滤性能与塑烧板相当、常高温抗氧化性能优良的瓦楞形复层结构多孔铝过滤材料。In order to control the emission of fine solid particles in the industrial flue gas at normal high temperature(200-250℃),a porous aluminum filter material with dual-corrugated structure was prepared by powder plasticizing warm pressing and pseudo-semi-solid hot pressing.The interface structure and properties(mechanics,filtration and normal high temperature oxidation resistance)were studied.The results show that the dual-corrugated structure is composed of the filter layer and support layer with a porosity of 50%-55%,a pore size of 20-25μm,40-45μm(A)and 1-10μm,19-48μm(B),respectively.The air permeability and filtration efficiency of the porous aluminum filter materials with dual-corrugated structure are(1.14-1.23)m^(3)/(h·kPa·m^(2)),86%,and(0.95-1.13)m^(3)/(h·kPa·m^(2)),90%respectively,when the pressure difference is 1.0-1.5 kPa.There is no obvious boundary between the layers,which are seamlessly connected.Compared with the glue bonded double-layer porous aluminum plate,the yield strength is increased by 31.58%.The oxidation rate at 250℃is 0.00735 mg/(cm^(2)·h).After 64 h of oxidation,the oxide film stopped growing,and the generated Al_(2)O_(3) during the oxidation process increases the pore wall thickness and pore size reduce from 20-25μm to 8-14μm,which is beneficial to further improve the filtration efficiency and filtration accuracy.Through the above research,the dual-corrugated structure porous aluminum filter material with seamless connection between layers,high strength,filtering performance equivalent to that of sinter-plate filter,and superior oxidation resistance at normal high temperature is obtained.

关 键 词：微米孔径铝基过滤材料 瓦楞形复层结构 力学性能 过滤性能 抗氧化性能 

分 类 号：TB31[一般工业技术—材料科学与工程]