Effect of trace Ce on high-temperature oxidation behavior of an Al-Si-coated Ni-based single crystal superalloy

Xiao-juan Pang; Shu-suo Li; Lu Qin; Yan-ling Pei; Sheng-kai Gong

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Effect of trace Ce on high-temperature oxidation behavior of an Al-Si-coated Ni-based single crystal superalloy

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Ni-based single crystal superalloy IC21 with different Ce contents was prepared by screw selection method,and A1-Si coatings were prepared by pack cementation.Cyclic oxidation and transient oxidation were carried out at 1150 ℃ to investigate the effect of Ce on the high-temperature oxidation behavior of A1-Si coatings.After cyclic oxidation at 1150 ℃,the addition of trace Ce decreased the mass gain of the Al-Si-coated samples and effectively improved oxidation performance and spallation resistance.In specimens without Ce doping,microstructure examination revealed that bulky γ'-Ni3A1 precipitated in oxidized coating because of high A1 consumption,and this finding suggests that Ce inhibits the consumption of Al in the coating during oxidation.Ce slows down the transformation of θ-Al2O3 to α-Al2O3 and improves the adhesion of the oxide scale.

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《钢铁研究学报（英文版）》 |2019年第1期|78-83|共6页
作者
Xiao-juan Pang; Shu-suo Li; Lu Qin; Yan-ling Pei; Sheng-kai Gong;
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School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

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Effect of trace Ce on high-temperature oxidation behavior of an Al-Si-coated Ni-based single crystal superalloy

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