Effect of Multiple Addition of Y, La and Ce on Oxidation Behavior of Ni-10Cr-5Al Alloy at 1000 ℃ in Air

doi:10.11902/1005.4537.2016.129

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 489-496 DOI: 10.11902/1005.4537.2016.129

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Effect of Multiple Addition of Y, La and Ce on Oxidation Behavior of Ni-10Cr-5Al Alloy at 1000 ℃ in Air

Jiapeng HUANG¹,Bin YANG²,Hang WANG²(

)

1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2. Institute of Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

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Abstract

Ni-10Cr-5Al alloys with addition of 1%(mass fraction) of Y, La, Ce, Y+La, Y+Ce and La+Ce respectively, were prepared by vacuum induction melting. Then their oxidation behavior in air at 1000 ℃ was studied by means of thermogravimetric analysis, X-ray diffraction and scanning electron microscope with energy dispersive spectroscope. The results indicated that the oxidation kinetics of the alloys with addition of different rare earth elements at 1000 ℃ obeyed the parabolic law; however only the single addition of Y could decrease the oxidation rate of Ni-10Cr-5Al alloy, but the addition of all others increased the oxidation rate of the alloys. The multiple additions of rare earth elements could promote the internal oxidation of the alloys along grain boundaries. Besides, the transformation of θ-Al₂O₃ to α-Al₂O₃ of the formed oxide scales is suppressed in alloys containing rare earths, which will beneficial to improve the adhesion of the oxide scale.

Key words: NiCrAl alloy rare earth element reactive element effect high temperature oxidation

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	Jiapeng HUANG
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Jiapeng HUANG,Bin YANG,Hang WANG. Effect of Multiple Addition of Y, La and Ce on Oxidation Behavior of Ni-10Cr-5Al Alloy at 1000 ℃ in Air. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 489-496.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.129 OR https://www.jcscp.org/EN/Y2016/V36/I5/489

Fig.1 Mass gains of all (a) and five (b) of Ni-10Cr-5Al sample with RE additions during oxidation at 1000 ℃ in air

Table 1 Values of oxidation rate coefficient k_p obtained by fitting the data in Fig.2

Fig.2 Squares of mass gains of all (a) and five (b) of Ni-10Cr-5Al alloys with RE vs time during oxidation at 1000 ℃

Fig.3 XRD patterns of the oxidescalesformed on various alloys after oxidation at 1000 ℃ for 200 h

Fig.4 Surface morphologies of Ni-10Cr-5Al alloy added with different rare earth elements after oxidation at 1000 ℃ in air for 200 h: (a,b) NiCrAl; (c, d) NiCrAl+Y; (e,f) NiCrAl+La; (g, h) NiCrAl+Ce; (i, j) NiCrAl+(Y+La); (k, l) NiCrAl+(Y+Ce); (m, n) NiCrAl+(La+Ce)

Table 2 Phase constitutions of oxide scales formed on various samples after oxidation at 1000 ℃ for 200 h

Fig.5 Cross-section morphologies of Ni-10Cr-5Al alloy added with different rare earth elements after oxidation at 1000 ℃ in air for 200 h: (a) NiCrAl; (b) NiCrAl+Y; (c) NiCrAl + La; (d) NiCrAl+Ce; (e) NiCrAl+(Y+La); (f) NiCrAl + (Y+Ce); (g) NiCrAl +(La+Ce)

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