Oxidation Behaviors of Four Candidate Materials for the Advanced Ultra-Supercritical Water Power Plant in Supercritical Water at 700 ℃

doi:10.7652/xjtuxb202102003

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Oxidation Behaviors of Four Candidate Materials for the Advanced Ultra-Supercritical Water Power Plant in Supercritical Water at 700 ℃

更新时间：2025-07-09

- Oxidation Behaviors of Four Candidate Materials for the Advanced Ultra-Supercritical Water Power Plant in Supercritical Water at 700 ℃
- Vol. 55, Issue 2, Pages: 18-26(2021)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202102003
  CLC： TK225
- Online First：10 February 2021，
  
  Published：2021
- 稿件说明：
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Oxidation Behaviors of Four Candidate Materials for the Advanced Ultra-Supercritical Water Power Plant in Supercritical Water at 700 ℃[J]. 2021, 55(2): 18-26.
DOI：

Oxidation Behaviors of Four Candidate Materials for the Advanced Ultra-Supercritical Water Power Plant in Supercritical Water at 700 ℃[J]. 2021, 55(2): 18-26. DOI： 10.7652/xjtuxb202102003.

摘要

为了筛选先进超超临界电站锅炉的候选材料

以先进超超临界电站锅炉候选合金材料Inconel 617、Inconel 740、HR6W和Sanicro 25为研究对象

研究了4种候选材料在700 ℃、25 MPa超临界水中氧化320 h后的氧化行为

分析了4种材料的氧化膜二维、三维形貌、微观结构及化学成分

测量了氧化增重

并将实验结果与文献结果进行了对比。结果表明:氧化320 h后

含铁量较高的HR6W和Sanicro 25合金表面形成了内层富铬、外层富铁的双层膜结构

含镍量较高的Inconel 617和Inconel 740合金形成了单层尖晶石结构氧化层; 环境温度、环境压力的增加对于合金在超临界水中的氧化增重均有促进作用; 超临界水与合金表面的铁元素反应生成氢

对于合金表面连续性铬氧化层的形成具有抑制作用。4种候选材料的氧化增重及氧化膜厚度由大到小排序均为:Sanicro 25、HR6W、Inconel 740、Inconel 617。

Abstract

Oxidation behaviors of four candidate materials for the advanced ultra-supercritical water power plant are studied in supercritical water at 700 ℃/25 MPa for 320 h. These four materials are Inconel 617

Inconel 740

HR6W and Sanicro 25. The 2-D and 3-D morphology

cross-sectional structure of the oxides formed on the alloys after exposure are observed

and the oxide phase are analyzed. The results are compared with those in other literature. Results show that the structure of the oxide films formed on HR6W and Sanicro 25 with high iron content forms a double layer structure with a Fe-rich outer layer and a Cr-rich inner layer after exposed in supercritical water at 700 ℃ for 320 h

while only one Cr-rich spinel structure layer is formed on Inconel 740 and Inconel 617 after exposed to supercritical water. The increase of ambient temperature and ambient pressure promotes the oxidation weight gain of the alloys in supercritical water. The reaction of supercritical water with Fe on the alloy surface to produce hydrogen has an inhibitory effect on the formation of continuous chromium oxide layer on the alloy surface. The order of the weight gain data and the oxide layer thickness of the four candidate materials is Sanicro 25>HR6W>Inconel 740>Inconel 617.

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