Fe 3 Al?4Cr  합금의 고온산화

김기영; 이동복; Gi-Young Kim; Dong-Bok Lee

Korean Journal of Materials Research, Vol.11, No.1, 34-38, January, 2001

Export Citation

Fe 3 Al?4Cr 합금의 고온산화

High Temperature Oxidation of Fe 3 Al?4Cr Alloys

김기영, 이동복

성균관대학교 플라즈마 응용 표면기술 연구 센터

Gi-Young Kim, and Dong-Bok Lee

Center for Advanced Plasma Surface Technology, Sungkyunkwan University, Suwon 440-746, Korea

초록

Fe-28%Al( Fe 3 Al )과 Fe-28%Al-4%Cr( Fe 3 Al?4Cr ) 금속간화합물을 대기중 1073, 1273, 1473k의 온도에서 최고 17일까지 장시간 산화시켰다. Fe 3 Al?4Cr 의 산화저항은 근본적으로 Fe 3 Al 과 거의 비슷하거나, 약간 우수하였다. Fe 3 Al 위에 형성된 산화물은 거의 순수한 α?AL 2 O 3 로만 구성되어 있었으며, Fe 3 Al?4Cr 위에 형성된 산화물은 약간의 Fe와 Cr 이온이 고용된 α?AL 2 O 3 로 구성되어 있었다. 외부산화막을 형성하기 위해 모재원소의 외부확산에 의해 산화물-모재 계면에는 Kirkendall 기공이 존재하였다. Fe 3 Al(?4Cr) 표면에 형성된 산화막은 1273k가지는 비교적 얇고 치밀하였으나, 1473k에서 산화막의 박리와 함께 상대적으로 큰 무게증가가 발생하였다.

Intermetallics of Fe-28%Al( Fe 3 Al ) and Fe-28%Al-4%Cr( Fe 3 Al?4Cr ) were oxidized at 1073, 1273 and 1473k in air for up to 17 days. The oxidation resistance of Fe 3 Al?4Cr was basically similar to or better than that of Fe 3 Al . The oxide scales formed on Fe 3 Al consisted essentially of pure α?AL 2 O 3 , while those formed on Fe 3 Al?4Cr consisted of α?AL 2 O 3 having dissolved iron and chromium ions. The preferential outward diffusion of substrate elements to form the outer oxide layer led to the formation of Kirkendall voids at the oxide-matrix interface. The scales formed on Fe 3 Al(?4Cr) were thin and dense up to 1273K, but they spalled easily at 1473K, accompanied by more weight gains.

Keywords:Intermetallics;Iron-aluminide;Chromium;Oxidation;Scale

[References]

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[1] Liu CT, Kumar KS, JOM, 45(5), 38 (1993)

[2] 박종우, 대한금속학회 회보, 5, 35 (1992)

[3] McKamey CG, DeVan JH, Tortorelli PI, Sikka VK, J. Mater. Res., 6, 1779 (1991)

[4] Sikka VK, Processing, Properties and Application of Iron Aluminides, eds. Schneibel JH, Crimp MA, TMS, Warrendale, PA, p. 3 (1994) (1994)

[5] Knibole JR, Wright RN, Mater. Sci. Eng. A, 153, 382 (1992)

[6] McKamey CG, Horton JA, Liu CT, Scrip. Metall., 22, 1679 (1988)

[7] 최한철, 최답천, 김관휴, 대한금속학회지, 33, 1677 (1995)

[8] DeVan JH, Oxidation of High-Temperature Intermetallics, eds. Grobstein T, Doychak J, TMS, Warrendale, PA, p. 107 (1989) (1989)

[9] Tortorelli PF, DeVan JH, Mat. Sci. Eng. A, 153, 573 (1992)

[10] Tortorelli PF, DeVan JH, Processing, Properties and Application of Iron Aluminides, eds Schneibel JH, Crimp MA, TMS, Warrendale, PA, p. 257 (1994) (1994)

[11] Rabin BH, Wright RN, Knibloe JR, Raman RV, Rale SV, Mat. Sci. Eng. A, 153, 706 (1992)

[12] Hagel WC, Corros., 21, 316 (1965)

[13] Bunting EN, Bur. Standards J. Research, 6, 948 (1931)

[14] Prescott R, Graham MJ, Oxid. Met., 38, 233 (1992)

[15] Kuenzly JD, Douglass DL, Oxid. Met., 8, 139 (1974)

[16] Stott FH, Mast. Sci. Tech., 4, 431 (1988)

[17] Meier GH, Oxidation of Intermetallics, eds. Grabke HJ, Schuze M, Wiley-VCH, New York, p. 15 (1997) (1997)

[18] Rommerskirchen I, Eltester B, Grabke HJ, Oxidation of Intermetallics, eds, Grabke HJ, Schutze M, Wiley-VCH, New York, p. 175 (1997) (1997)