Effect of Pre-oxidation Temperature on High-Temperature Cyclic Oxidation Resistance of Ni-20Cr-5Al-0.2Y<sub>2</sub>O<sub>3</sub> Alloy

SUN Duan-jun; LIANG Chun-yuan; SHANG Jin-long; SONG Ya-ru; YIN Ji-hui; ZHANG Xiu-hai

doi:10.11973/jxgccl201704009

Materials and Mechanical Engineering > 2017 > 41(4): 39-43. > DOI: 10.11973/jxgccl201704009

SUN Duan-jun, LIANG Chun-yuan, SHANG Jin-long, SONG Ya-ru, YIN Ji-hui, ZHANG Xiu-hai. Effect of Pre-oxidation Temperature on High-Temperature Cyclic Oxidation Resistance of Ni-20Cr-5Al-0.2Y₂O₃ Alloy[J]. Materials and Mechanical Engineering, 2017, 41(4): 39-43. DOI: 10.11973/jxgccl201704009

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Effect of Pre-oxidation Temperature on High-Temperature Cyclic Oxidation Resistance of Ni-20Cr-5Al-0.2Y₂O₃ Alloy

Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education, Guangxi University, Nanning 530004, China

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Received Date: February 21, 2016
Revised Date: February 25, 2017

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Abstract

Ni-20Cr-5Al and Ni-20Cr-5Al-0.2Y₂O₃ (mass fraction/%) alloys were prepared by powder metallurgic technology. The Ni-20Cr-5Al-0.2Y₂O₃ alloy was first pre-oxidized at different temperatures from 500 ℃ to 1 100 ℃, and then the un-oxidized and pre-oxidized alloys were cyclic oxidized at 1 150 ℃ for 15 h. The effects of Y₂O₃ and pre-oxidation temperature on the high-temperature cyclic oxidation resistance of the alloys were studied. The results show that the high-temperature cyclic oxidation resistance of Ni-20Cr-5Al alloy was improved with the addition of 0.2wt% Y₂O₃. The pre-oxidation can improve the high-temperature oxidation resistance of Ni-20Cr-5Al-0.2Y₂O₃ alloy effectively. Furthermore, when the pre-oxidation temperature was 700 ℃, the alloy achieved the best high-temperature cyclic oxidation resistance. The reason is that a dense protective oxide scale was formed on the surface of the alloy after pre-oxidation, which prevented the alloy from the further oxidation.
- pre-oxidation,
- high temperature cyclic oxidation,
- Y₂O₃,
- Ni-20Cr-5Al alloy

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Effect of Pre-oxidation Temperature on High-Temperature Cyclic Oxidation Resistance of Ni-20Cr-5Al-0.2Y2O3 Alloy

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Effect of Pre-oxidation Temperature on High-Temperature Cyclic Oxidation Resistance of Ni-20Cr-5Al-0.2Y₂O₃ Alloy