文献类型：期刊文献

英文题名：High-loading washcoat of γ-alumina on FeCrAlloy mesh with acid-free slurry

作者：Chen, Feng[1];Ding, Qiang[1];Wang, Xingwei[1];Wang, Hongtao[2];Zhang, Li[1]

机构：[1]East China Univ Sci & Technol, Shanghai 200237, Peoples R China;[2]China Petr & Chem Corp Dalian Petrochem Res Inst, Dalian 113001, Peoples R China

年份：2020

卷号：403

外文期刊名：SURFACE & COATINGS TECHNOLOGY

收录：;EI(收录号：20203809183906);WOS:【SCI-EXPANDED(收录号:WOS:000590180600051)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 51776074) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Slurry method; Acid-free system; Additives; Washcoat loading; Adhesive strength

摘要：Acid slurry for washcoating tends to cause acid pollution on substrate and active components and even reduces the loading capacity. To solve the problems, washcoat of gamma-Al2O3 on FeCrAl mesh was prepared with acid-free slurry in this study. Effects of additives on loading and adhesive property were investigated. The macromorphology, microstructure, phase constituents, pore characteristics and adhesive strength of the washcoat were analyzed with scanning electron microscopy, X-ray diffraction, nitrogen physical adsorption and ultrasonic oscillation tests. Experimental results indicated that adding 0.7 wt% hydroxyethyl methyl cellulose (HEMC) to the slurry could improve the loading capacity and adhesive property of washcoats. With the same additive added, washcoats prepared by neutral slurry demonstrated the highest adhesive strength, with its bonding strength sharply reduced under strong acidic or alkaline conditions. More importantly, the washcoat prepared with acidfree slurry could disperse homogeneously on the structured substrate, which could enhance the mechanical properties of the washcoat. There was no blockage of the coated meshes. The maximum washcoat loading was 24.52% and the average mass loss after ultrasonic oscillation was 1.66%, showing a high loading capacity and excellent adhesive strength.