高Alフェライト系耐熱鋼フォイルの高温酸化

概要

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In order to evaluate the oxidation resistance of the very thin materials, cold rolled and bright annealed 50μm thick foils were prepared in three alloys-Alloy A with the basic composition, 19Cr-5Al, Alloy B and Alloy C both bearing a small amount of rare earth elements, 0.015 (Ce+La) and 0.09Y respectively (all in wt%). The results of high-temperature oxidation tests on them in still air at 1050°C through 1200°C for max. 96h are hereunder.(1) At the early and steady stage the weight gain for all three alloys obeyed the parabolic law. Following the breakaway at 1150°C/24h, the plain Alloy A underwent the catastrophic oxidation.(2) Doping with rare earth elements delayed the breakaway for Alloy B to 1200°C/24h and suppressed it for Alloy C up to 1200°C/96h.(3) The prime oxides consisted mainly of α-Al2O3 and those after breakaway were dominated by M2O3 (M:Cr, Fe). Finally the entire body of foils turned into M2O3.(4) The oxidation kinetics and oxide morphologies imply that minor rare earth solutes augment the outward diffusion of Al and consequently improve the stability of surface α-Al2O3 films.
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