汽车尾气净化催化剂金属载体表面预处理的研究  

Study on Surface Pre-treatment of Metallic Substrate for Auto-catalysts

作　　者：刘煙 [1] 赵云昆 [2] 卢军 [2] 黄荣光 [2] 孙加林 [1] 

机构地区：[1]昆明理工大学,云南,昆明,650093,昆明贵金属研究所,云南,昆明,650221 [2]昆明贵金属研究所,云南,昆明,650221

出　　处：《贵金属》2005年第1期12-16,共5页Precious Metals

基　　金：国家高技术研究发展计划(863计划)资助项目(2001AA643010)

摘　　要：金属载体催化剂在汽车尾气净化领域具有明显应用前景,但金属载体与活性涂层的牢固结合以及金属的高温抗氧化性能是急需解决的问题。本文通过表面预处理在FeCrAl合金箔片表面生成Al2O3过渡层,使γ-Al2O3活性涂层与FeCrAl箔良好结合,并采用SEM、EDS、XPS、XRD、超声振落及热冲击的方法研究了预处理后FeCrAl箔的表面结构、活性涂层的性能及与FeCrAl箔的结合。结果表明,经过预处理的FeCrAl箔对活性涂层的一次负载率>11%;在500℃和900℃下,涂层的比表面积分别为166.0m2/g和71.05m2/g;在59kHz,30min超声波作用下,涂层脱落率为1.5%～2.5%;800℃至室温热冲击涂层损失率为0.1449%。该Al2O3过渡层有可能使金属载体与活性涂层间的结合问题得到解决。Metal-supported platinum group metal catalysts are promising candidate for purification of vehicle exhaust emission, however, the film adhesion ofγ-Al2O3 active coating with the metal support and the oxidation resistance of metals at high temperature are problems needle to solve. In the present paper, an Al2O3 transition layer was formed on the surface of the FeCrAl toil by the surface pre-treatment, and a well-adheredγ-Al2O3 coating was loaded on the FeCrAl foil with Al2O3 layer. SEM, EDS, XPS, XRD, ultrasonic wave and hot shock were used for characterization of the transition layer and for investigation ofγ-Al2O3 coating and adhesion between the coating and the FeCrAl foil. The results indicated that the one time loading rate ofγ-Al2O3>11%; the surface areas of the coating at 500℃ and 900℃ were 166.6m2/g and 71.05m2/g, respectively; the desquamated rate of the coating at 59 kHz for 30min was 1.5%～2.5%; the losing rate of the coating was 0.1449% under hot shock from 800℃ to RT. This Al2O3 transition layer could solve the problem of firm adhesion between the Al2O3 coating and the FeCrAl foil support.

关 键 词：活性涂层 表面预处理 金属载体催化剂 汽车尾气净化催化剂 Γ-AL2O3 比表面积 热冲击 FeCrAl合金 高温抗氧化性能 过渡层 

分 类 号：TG174[金属学及工艺—金属表面处理] TQ426.96[金属学及工艺—金属学]