著者

荒木 健一 小澤 正邦

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.69, no.7, pp.532-537, 2020-07-15 (Released:2020-07-20)

参考文献数

36

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Effect of La2O3-Y2O3 additives on coating and thermal stability of alumina layer on FeCrAl-alloy substrate was investigated. The stable alumina catalytic coat layer is required and its processing parameters are important in practical technology to fabricate automotive honeycomb-type catalytic converters. The two-step modification in La2O3-Y2O3-modified Al2O3 induced better slurry regarding with surface charge as colloid dispersion and rheological properties with lower viscosity and low stress under moderate shear rate condition. Surface Y2O3 controls zeta potential to high pH region so that alkaline solution can be applied to metal and alloy substrates. The newly modified Al2O3 coat layer can react with alumina interlayer grown on FeCrAl alloy surface. In conclusion, the optimal coating stability was attained with present La2O3-Y2O3 co-doped Al2O3.