Study on the Oxidation Behavior of High-Temperature Alloys in Rotary Calciners for Nuclear Waste Treatment

WANG Qin, WANG Chengxu, LIU Zhongli

doi:10.16577/j.issn.1001-1560.2025.0013

Materials Protection >

2025 , Vol. 58 >Issue 1: 109 - 115

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0013

Study on the Oxidation Behavior of High-Temperature Alloys in Rotary Calciners for Nuclear Waste Treatment

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(1.School of Mechanical and Electrical Engineering， Henan Mechanical and Electrical Vocational College， Zhengzhou 451191， China；2.School of Nuclear Equipment and Engineering， Yantai University， Yantai 264005， China)

LIU Zhongli(1973－)， Ph.D.， Professor， Research Focus: High-End Equipment Materials and Process， Tel.:13573577615， E-mail: liuzhongli＠ytu.edu.cn

Received date: 2024-07-22

Revised date: 2024-09-25

Accepted date: 2024-09-27

Online published: 2025-02-28

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Abstract

The two-step cold crucible glass vitrification technology is currently the international mainstream high-level radioactive waste treatment method， and the high-temperature oxidation problem of the structural material of the rotary calcination furnace， as a key equipment， is related to the industrial application of this technology and has important research significance.High-temperature alloy exhibit good high-temperature strength.However， whether it can be used as structural components for the rotary calciner remains to be verified.In this study， high-temperature oxidation tests were conducted on four high-temperature alloys: 316H stainless steel， nickel-based alloy 690， Hastelloy N， and nickel-based alloy 625.The weight gain of the samples was measured， and oxidation kinetics curves were plotted.The phase composition， morphology and composition of the oxide scales were analyzed using X-ray diffraction (XRD)， scanning electron microscopy (SEM) and energydispersive spectroscopy (EDS).The oxidation mechanisms of the four high-temperature alloy were analyzed.The results showed that all four samples exhibited good oxidation resistance at 600 ℃， with relatively small weight gains.At 800 ℃， Hastelloy N and 316H stainless steel showed poor oxidation resistance，with loose oxide layers and spallation.Nickel -based alloy 690 demonstrated better oxidation resistance，with a denser oxide layer， although the oxide particles were relatively large.Nickel- based alloy 625 exhibited the best oxidation resistance， with an oxidation rate constant Kp of approximately 1.43×10－7 mg2/(cm4∙s).The oxide scale was composed of stable Cr2O3， and the oxide layer was uniform， dense and fine-grained.Due to its excellent oxidation resistance，nickel-based alloy 625 can be used as a structural material for rotary calciners， which is beneficial for extending the service life of the equipment.

Key words： nuclear waste treatment; high-temperature alloy; rotary calciner; high-temperature oxidation

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WANG Qin, WANG Chengxu, LIU Zhongli . Study on the Oxidation Behavior of High-Temperature Alloys in Rotary Calciners for Nuclear Waste Treatment[J]. Materials Protection, 2025 , 58(1) : 109 -115 . DOI: 10.16577/j.issn.1001-1560.2025.0013

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