1995 Volume 81 Issue 8 Pages 851-856
High-temperature oxidation behavior of γ-Al2O3 slurry coated Fe-20Cr-5Al based thin foil (50μm in thickness) for a catalytic converter has been investigated. An anomalous foil expansion during high-temperature oxidation was observed in a case that the γ-Al2O3 slurry contains Ce3+ or La3+ or Y3+. The expansion was accelerated by minor additives to the stainless steel foil such as Nb, Ti, Ta, or Mo. On the other hand, the expansion was effectively suppressed by a small addition of rare-earth elements or yttrium to the stainless steel foil. It has been concluded that the foil expansion was resulted from a creep deformation by a compressive stress which is accumulated in the course of lateral growth of α-Al2O3 scale formed between the foil and the coated layer.
