新型无机硅酸盐复合涂层制备及其在高温水蒸气环境的氧化行为

doi:10.11900/0412.1961.2021.00044

金属学报

2022, Vol. 58

Issue (8): 1083-1092 DOI: 10.11900/0412.1961.2021.00044

研究论文

本期目录 | 过刊浏览

新型无机硅酸盐复合涂层制备及其在高温水蒸气环境的氧化行为

丛鸿达¹, 王金龙¹(

), 王成²^,³, 宁珅¹, 高若恒¹, 杜瑶², 陈明辉¹, 朱圣龙², 王福会¹

^1.东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819
^2.中国科学院金属研究所沈阳 110016
^3.江苏集萃道路工程技术与装备研究所有限公司徐州 220005

A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere

CONG Hongda¹, WANG Jinlong¹(

), WANG Cheng²^,³, NING Shen¹, GAO Ruoheng¹, DU Yao², CHEN Minghui¹, ZHU Shenglong², WANG Fuhui¹

^1.Shenyang National Key Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Jiangsu JITRI Road Engineering Technology and Equipment Research Institude Co. Ltd., Xuzhou 220005, China

引用本文:

丛鸿达, 王金龙, 王成, 宁珅, 高若恒, 杜瑶, 陈明辉, 朱圣龙, 王福会. 新型无机硅酸盐复合涂层制备及其在高温水蒸气环境的氧化行为[J]. 金属学报, 2022, 58(8): 1083-1092.
Hongda CONG, Jinlong WANG, Cheng WANG, Shen NING, Ruoheng GAO, Yao DU, Minghui CHEN, Shenglong ZHU, Fuhui WANG. A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere[J]. Acta Metall Sin, 2022, 58(8): 1083-1092.

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摘要:

以CB2钢为基体,设计并制备了一种新型无机硅酸盐复合涂层。使用高温水蒸气模拟装置对比研究了CB2钢与涂层试样在650℃高温水蒸气条件下服役1000 h的氧化行为。结果表明,与无涂层的CB2钢样品相比,施加防护涂层的CB2钢的氧化速率减缓30倍,涂层起到了良好的保护作用。CB2钢经氧化1000 h后,氧化层表层疏松且有明显空隙等缺陷,氧化产物以Fe₂O₃为主；无机硅酸盐复合涂层显著提高了CB2钢的抗氧化性能,经过长期服役(1000 h)后,涂层试片没有出现剥落和开裂的现象。

关键词 ： CB2钢, 无机硅酸盐涂层, 水蒸气氧化, 高温氧化

Abstract：

CB2 steel (ZG12Cr9Mo1Co1NiVNbNB) is a ferritic stainless steel with excellent creep properties at high temperature (550-700^oC) and is mainly used in 600^oC ultrasupercritical units. The poor oxidation resistance of the material limits its practical applications in harsh, high-temperature environments, in which the steam unit faces high-temperature water vapor for a long period of time. Therefore, surface modification or coating has become an important means to improve the high-temperature oxidation resistance of the material. An inorganic silicate coating has the advantages of high thermal-chemical stability, similar thermal expansion coefficient, and simple preparation process, which can significantly improve the oxidation and corrosion resistance of the material. In this study, a new type of inorganic silicate composite coating was designed, based on the CB2 steel. The oxidation behavior of CB2 steel and coated specimens at 650^oC high-temperature steam atmosphere for 1000 h was studied by using a high-temperature water vapor simulation device. The results showed that the oxidation rate of the coated CB2 steel was 30 times slower than that of uncoated CB2 steel; thus, the coating exhibited a good protective effect. After 1000 h of oxidation, the oxide scale on the CB2 steel was loose and cracked with obvious voids and the oxidation product was mainly composed of Fe₂O₃. The inorganic silicate composite coating significantly improved the oxidation resistance of CB2 steel; after 1000 h of oxidation, no spallation areas or cracks were found.

Key words： CB2 steel inorganic potassium silicate coating steam atmosphere oxidation high-temperature oxidation

收稿日期: 2021-01-22

ZTFLH:

TG178

基金资助:国家自然科学基金项目(51671053);国家自然科学基金项目(51801021);工信部项目(MJ-2017-J-99)

作者简介: 丛鸿达,男,1996年生,硕士生

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	丛鸿达
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	高若恒
	杜瑶
	陈明辉
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	王福会
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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00044 或 https://www.ams.org.cn/CN/Y2022/V58/I8/1083

表1 不同填料经650℃氧化后粉料颜色和状态的变化

表2 AlH2P3O10在硅酸钾中的固化表现

图1 高温水蒸气氧化实验模拟装置

图2 CB2钢与无机防护涂层在水蒸气650℃高温环境中的氧化动力学曲线

图3 CB2钢和无机防护涂层在水蒸气650℃高温环境中氧化1000 h后的XRD谱

图4 CB2钢与无机防护涂层在水蒸气650℃高温环境氧化500和1000 h后的表面微观形貌

图5 CB2钢与无机防护涂层在水蒸气650℃高温环境氧化500和1000 h后的截面微观形貌Color online

表3 图5中1~4点EDS分析 (mass fraction / %)

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