| 摘要 |
PURPOSE: To produce an Fe-Cr-Al alloy foil material excellent in high temp. oxidation resistance by subjecting a porous sheet sintered material, containing specific amounts of Cr, Al, and Fe and having specific theoretical density ratio and specific thickness, to rolling and forming to specific theoretical density. CONSTITUTION: An Fe-base alloy, containing, by weight, 15-35% Cr and 7-20% Al, is used. A porous sheet sintered material, having 50-85% theoretical density ratio and 30-500μm thickness, is rolled and formed into an Fe-Cr-Al alloy foil material having >=90% theoretical density ratio. Cr has a function of improving high temp. oxidation resistance, but toughness is deteriorated if Cr is contained in excess. Although Al has a function of improving high temp. oxidation resistance to a greater extent by the coexistence with Cr, a sinterability is lowered if Al is contained in excess. When theoretical density ratio is lower than 50%, strength becomes insufficient, and cracking is brought about at rolling when it exceeds 85%. Sufficient rolling cannot be done when thickness is small, and the cracking is brought about when it is large. When the theoretical density ratio is less than 90%, strength becomes insufficient.
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