EFFECTS OF NANO–CeO2p ON OXIDATION BEHAVIORS OF NiCoCrAlY LASER CLADDING COATINGS ON Ni–BASED SUPERALLOYS

Acta Metall Sin

2009, Vol. 45

Issue (8): 971-977 DOI:

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EFFECTS OF NANO–CeO_2p ON OXIDATION BEHAVIORS OF NiCoCrAlY LASER CLADDING COATINGS ON Ni–BASED SUPERALLOYS

WANG Hongyu ^1;2; ZUO Dunwen ¹; WANG Mingdi ³; SHAO Jianbing ¹

1. Jiangsu Key Laboratory of Precision and Micro–manufacturing Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016
2. School of Mechanical Engineering; Jiangsu University; Zhenjiang 212013
3. College of Mechanical and Electrical Engineering; Soochow University; Suzhou 215021

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WANG Hongyu ZUO Dunwen WANG Mingdi SHAO Jianbing. EFFECTS OF NANO–CeO_2p ON OXIDATION BEHAVIORS OF NiCoCrAlY LASER CLADDING COATINGS ON Ni–BASED SUPERALLOYS. Acta Metall Sin, 2009, 45(8): 971-977.

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Abstract

Nano-CeO_2p, which is most commonly used as a kind of rare earth modified material of alloys, possesses a prominent advantage in improving oxidation resistance. To study how nano-CeO_2pwill affect the oxidation resistance of NiCoCrAlY bondcoat in double--layer thermal barrier coatings, in this work, four kinds of the NiCoCrAlY coatings with different contents of nano-CeO_2p were prepared on the surface of a Ni--based superalloy using laser cladding technology, their isothermal oxidation behaviors in atmosphere under 1050℃ were investigated, and the influence mechanism of nano-CeO_2p on the oxidation resistance of coatings was preliminary discussed. The results show that all these coatings with nano-CeO_2p have better oxidation resistance than those without nano-CeO_2p, among which the coating with 2% (mass fraction) nano-CeO_2p has the best oxidation
resistance. After 100 hours of oxidation, its oxidation mass gain is only 1.56 mg/cm², reducing by more than half compared with the coatings without nano-CeO_2p; meanwhile, it takes extremely short time to enter the steady oxidation stage, only about 1/20 of the coating without nano-CeO_2p. Besides, the oxide layer of the coating is still very dense even after a long time oxidation and only a slight internal oxidation takes place within the coating, however, in that case, the oxide layer of the coatings without nano-CeO_2p is out of operation.

Key words: NiCoCrAlY coatig isothermal oxidation nano–CeO_2p influence mechanism laser cladding Ni–based superalloy

Received: 14 January 2009

ZTFLH:	TG174.4
	TF125.5

Fund:

Supported by Specialized Research Fund for the Doctoral Program of Higher Education (No.20060287019), Opening Research Fund of Jiangsu Key Laboratory of Tribology (No.kjsmcx07001) and Graduate Innovation Foundation of Jiangsu Province (No.CX08B–039Z)

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	YU Hong-Yu
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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I8/971

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