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| HIGH TEMERATURE OXIDATION BEHAVIOR OF (Ni,Pd) Al COATION |
| Mengjin Meng;Xiaofeng Sun;Hengrong Guan;Xiaoxia Jiang |
| 中国科学院金属研究所 |
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Abstract (Ni,Pd)Al coating prepared by low pressure pack cem entation on the nickel-based superalloy M38 predeposited Pd-20mass%Ni alloy,is c omposed by β-(Ni,Pd)Al phase,and the earlier stage isothermal oxidation beh avior is investigated by TGA、SEM at 800℃-1100℃.It is found that oxidation ki netics accord preferably with parabolic law at 800℃，900℃and 1100℃,but not at 1000℃.θ-Al2O3 and α-Al2O3 are mainly the oxidation product a nd γ-Al2O3 is very little at 800℃～900℃,θ-Al2O3 and α-A l2O3 at 1000℃,and only α-Al2O3 at 1100℃.In addition,a little of T iO2 exists on the coating surface,and the content of TiO2 is increases with rising of the temperature.
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Received: 03 June 2002
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Corresponding Authors:
Mengjin Meng
E-mail: mjli@imr.ac.cn
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