HIGH TEMPERATURE OXIDATION BEHAVIOR OF LOW PRESSURE GAS PHASE DEPOSITED ALUMINIDE COATINGS ON Co-BASE SUPERALLOY DZ40m

J Chin Soc Corr Pro

1999, Vol. 19

Issue (3): 144-150 DOI:

Research Report

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HIGH TEMPERATURE OXIDATION BEHAVIOR OF LOW PRESSURE GAS PHASE DEPOSITED ALUMINIDE COATINGS ON Co-BASE SUPERALLOY DZ40m

Peisheng Liu

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Abstract High temperature oxidation behavior of aluminide coatings obtained by low pressure gas phase deposition under 0～0.014MPa at 1080℃ for 4 hours on Co-base superalloy DZ40M has been primarily investigated.The results indicated that isothermal oxidation process of the coatings in air at 900～1100℃ showed three stages,including the initial,the stable and the accelerative.During the initial stage the coating oxidation controlled by interface reaction developed rapidly.The stable stage was controlled by diffusion within oxide film and proceeded very slowly.Because the degeneration of the coatings obsturcted the formation of the protective oxide scale,the samples were oxidized stronhly during the accelerative stage.The addition of Ti during deposition and increase in temperature accelerated the oxidation and degeneration of the coating, and transfered the stable oxidation stage into the accelerative.Due to the formation of θ-Al2O3 the oxidation weight gains of the coatings at lower temperature were more than that at higher temperature,thus decreased in the order:at 900℃,1000℃ and 1050℃.At 1050℃,only α-Al2O3 appeared.

Key words: Co-base superalloy DZ40M Aluminide coating High temperature oxidation

Received: 22 July 2005

Corresponding Authors: Peishen Liu

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Peisheng Liu. HIGH TEMPERATURE OXIDATION BEHAVIOR OF LOW PRESSURE GAS PHASE DEPOSITED ALUMINIDE COATINGS ON Co-BASE SUPERALLOY DZ40m. J Chin Soc Corr Pro, 1999, 19(3): 144-150 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1999/V19/I3/144

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