CYCLIC OXIDATION BEHAVIOR OF THERMAL BARRIERCOATINGS ON SINGLE CRYSTAL SUPERALLOYS

J Chin Soc Corr Pro

2002, Vol. 22

Issue (2): 111-114 DOI:

Research Report

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CYCLIC OXIDATION BEHAVIOR OF THERMAL BARRIERCOATINGS ON SINGLE CRYSTAL SUPERALLOYS

Zhongyuan Zhang;Meiheng Li;Xiaofeng Sun

中科院金属所

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Abstract The thermal barrier coatings (TBC),which Ni30C r12Al0.3Y bond coating was deposited by magnetron sputtering and ZrO2 ceramic top coating was deposited by electron beam-physical vapor deposition (EB-PVD),wa s produced on Ni-base superalloy.The bond coatings,which the mean grain size was less than 100 nm,were nanostructured coatings,and had good oxidation-resist ance.The ceramic topcoats,which were columnar structure,permitted larger strain in the coatings.The as-deposited ceramic coatings consisted of large quantity no nequilibrium tetragonal (t′),a small amount cubic (c) and monoclinic ( m) phases.The t′ phases,which had important role to the stabilization o f zirconia at high temperature,can not directly transform into m phase during co oli ng.During cyclic oxidation at 1050℃,the scale of the cast alloy had spalled aft er two cycles.After 100 cycles,the surface scale of single-crystal superalloy wa s mainly composed of NiO、Cr2O3,a little Al2O3 and pores by the Kirkenda ll effect.However,the ceramic coatings,which had microcrack,have not spalled and the thermally grown oxide (TGO) was Al2O3.There were some microcrack betwee n TGO and bond coating after 300 cycles.

Key words: thermal barrier coating cyclic oxidation

Received: 03 December 2001

ZTFLH:

TG174.451

Corresponding Authors: Zhongyuan Zhang

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Zhongyuan Zhang; Meiheng Li; Xiaofeng Sun. CYCLIC OXIDATION BEHAVIOR OF THERMAL BARRIERCOATINGS ON SINGLE CRYSTAL SUPERALLOYS. J Chin Soc Corr Pro, 2002, 22(2): 111-114 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I2/111

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