Co-20Re-25Cr-1Si合金在0.1 MPa纯O<sub>2</sub>中的高温氧化行为

doi:10.11902/1005.4537.2019.149

中国腐蚀与防护学报

2020, Vol. 40

Issue (1): 75-80 DOI: 10.11902/1005.4537.2019.149

研究报告

本期目录 | 过刊浏览

Co-20Re-25Cr-1Si合金在0.1 MPa纯O₂中的高温氧化行为

徐勋虎¹,何翠群²,向军淮¹(

),王玲¹,张洪华¹,郑晓冬¹

1. 江西科技师范大学江西省材料表面工程重点实验室南昌 330013
2. 南昌工程学院机械与电气工程学院南昌 330099

High Temperature Oxidation Behavior of Co-20Re-25Cr-1Si Alloy in 0.1 MPa Pure Oxygen

XU Xunhu¹,HE Cuiqun²,XIANG Junhuai¹(

),WANG Ling¹,ZHANG Honghua¹,ZHENG Xiaodong¹

1. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
2. School of Mechanical and Electronic Engineering, Nanchang Institute of Technology, Nanchang 330099, China

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摘要:

研究了四元Co-20Re-25Cr-1Si合金在1000和1100 ℃下0.1 MPa纯O₂中24 h的恒温氧化行为。在两个温度下，合金的氧化动力学曲线很不规则，由于表面形成的氧化膜不能阻止合金中Re以ReO₃形式向外蒸发，合金均出现了明显的氧化失重现象。但在1100 ℃下，合金在氧化初期大约15 min内发生了短暂的持续增重现象；而在1000 ℃下合金一直处于失重状态。在两个温度下形成的氧化膜非常类似，最外层为较厚的CoO层，次外层为CoO和CoCr₂O₄的混合氧化物，内层为薄且有一定连续性的Cr₂O₃保护层，其下存在着一个Si的内氧化区。由于合金在1000 ℃下形成的Cr₂O₃保护层更加连续与致密，因此合金在1000 ℃表现出较好的抗高温氧化性能。

关键词 ： Co-Re-Cr-Si合金, 恒温氧化, 抗高温氧化性能, Si的内氧化

Abstract：

The iso-thermal oxidation behavior of Co-20Re-25Cr-1Si alloy in 0.1 MPa pure oxygen at 1000~1100 ℃ for 24 h was investigated. The oxidation kinetics is irregular at both temperatures. The alloys show obvious mass loss due to the evaporation of Re element in the form of ReO₃. However, at 1100 ℃ continuous mass gain occurred during the initial 15 min of oxidation, while at 1000 ℃ the alloys remained in a mass loss state during the whole oxidation process. The scales formed at both temperatures are very similar. The outermost layer is composed of CoO, while the subsequent layer is composed of CoO and CoCr₂O₄. The innermost layer is a thin and protective layer of Cr₂O₃ with a certain degree of continuity. Moreover, there is an inner oxidation zone of Si beneath the outer scales. Since the Cr₂O₃ layer formed at 1000 ℃ is more continuous and denser, the alloy exhibits a better oxidation resistance at 1000 ℃.

Key words： Co-Re-Cr-Si alloy iso-thermal oxidation high temperature oxidation resistance internal oxidation of Si

收稿日期: 2019-09-08

ZTFLH:

TG146.418

基金资助:江西省教育厅科技项目(GJJ160770);江西科技师范大学研究生创新专项基金(YC2018-X01)

通讯作者: 向军淮 E-mail: xiangjunhuai@163.com

Corresponding author: Junhuai XIANG E-mail: xiangjunhuai@163.com

作者简介: 徐勋虎，男，1994年生，硕士生

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引用本文:

徐勋虎,何翠群,向军淮,王玲,张洪华,郑晓冬. Co-20Re-25Cr-1Si合金在0.1 MPa纯O₂中的高温氧化行为[J]. 中国腐蚀与防护学报, 2020, 40(1): 75-80.
Xunhu XU, Cuiqun HE, Junhuai XIANG, Ling WANG, Honghua ZHANG, Xiaodong ZHENG. High Temperature Oxidation Behavior of Co-20Re-25Cr-1Si Alloy in 0.1 MPa Pure Oxygen. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 75-80.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.149 或 https://www.jcscp.org/CN/Y2020/V40/I1/75

图1 四元Co-20Re-25Cr-1Si合金的微观结构

表1 Co-20Re-25Cr-1Si合金的相组成及其化学成分 (atomic fraction / %)

图2 Co-20Re-25Cr-1Si合金在1000和1100 ℃恒温氧化24 h的动力学曲线及抛物线图

图3 Co-20Re-25Cr-1Si合金在1000与1100 °C下初期36 min的氧化动力学曲线

图4 Co-20Re-25Cr-1Si合金在1000和1100 ℃恒温氧化24 h后的表面形貌

图5 Co-20Re-25Cr-1Si合金在1000和1100 ℃恒温氧化24 h后的截面形貌

图6 Co-20Re-25Cr-1Si合金在1000和1100 ℃恒温氧化24 h后的元素分布图

图7 Co-20Re-25Cr-1Si合金在1000和1100 ℃恒温氧化24 h后的XRD谱

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