OXIDATION BEHAVIOR OF SIMPLE AND Pt-MODIFIED ALUMINIDE COATINGS ON IN738 AT 1100°C

Cor Sci Pro Tech

2000, Vol. 12

Issue (2): 63-67 DOI:

Research Report

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OXIDATION BEHAVIOR OF SIMPLE AND Pt-MODIFIED ALUMINIDE COATINGS ON IN738 AT 1100°C

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Abstract The oxidation of both Iw and high-activity simple and Pt-modified aluminide coatings on nickel base superalloy IN738 has been studied in static air at llOOOC up to 1000 h. For all coatings oxidation followed a parabolic law up to 400 h. The M Pt-modified castings shaved better protectiveness with lower mass gains and snaller rate constants, especially for a long ten. The presence of Pt significantly improved the resistance to y'Ni,Al formation, pranoted selective oxidation of aluminum by preventing the transport of other elements outwards to A1,Q scale and resulted in the formation of purer, slaver-grawing and more adherent A1203 scales, delaying the onset of scale spalling for m types of coatings and of oxide nodules growth for the high aluminum activity coating.

Key words: platinum aluminide coatings oxidation

Received: 01 January 1900

TG172.82

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. OXIDATION BEHAVIOR OF SIMPLE AND Pt-MODIFIED ALUMINIDE COATINGS ON IN738 AT 1100°C. Cor Sci Pro Tech, 2000, 12(2): 63-67 .

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https://www.cspt.org.cn/EN/ OR https://www.cspt.org.cn/EN/Y2000/V12/I2/63

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