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| 粉末包埋渗铝与气氛渗铝对P92钢650℃饱和蒸汽氧化行为的影响 |
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周永莉1,2, 鲁金涛1, 黄锦阳1, 杨珍1, 袁勇1, 谷月峰1, 赵钦新2
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1.西安热工研究院有限公司 电站锅炉煤清洁燃烧国家工程中心, 西安 710032;2.西安交通大学 热流科学与工程教 育部重点实验室, 西安 710049
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| 摘要: |
| 表面渗铝技术可以在不改变基体材料力学性能的基础上显著提高基体的抗高温蒸汽氧化性能。 利用低温粉末包埋和气氛渗铝两种方法在 P92 钢表面制备了铝化物涂层,并结合氧化增重法、扫描电镜观察及 XRD 分析,研究了两种工艺下铝化物涂层的 650 ℃饱和蒸汽氧化行为。 结果表明:P92 钢抗氧化能力不足,生成了由外层疏松层瘤状富铁氧化物与表面氧化膜下方内氧化物 FeCr2O4 组成的双层结构氧化膜,外层富铁氧化膜在氧化 300 h 后发生剥落;低温包埋渗铝所得涂层为 β-FeAl 层,氧化 500 h 后试样表面形成极薄的保护性 α-Al2O3 氧化膜(<0. 2 μm);气氛渗铝涂层为单层 Fe3Al 结构,氧化 500 h 后试样外表面形成了 Fe3O4+Fe2O3 氧化膜,厚度为 1. 3 μm,靠近涂层表面生成单层连续 Al2O3 氧化膜。 采用低温包埋和气氛渗铝均可提升 P92 钢的抗蒸汽氧化能力。 |
| 关键词: P92 铝化物涂层 粉末包埋渗铝 气氛渗铝 蒸汽氧化 内扩散 |
| DOI：10.11933/j.issn.1007-9289.20190620001 |
| 分类号:TG174.4 |
| 文章编号:1007-9289(2020)04-0111-10 |
| 文献标识码:A |
| 基金项目:陕西省自然科学基础研究计划(2020JM-716)；中国华能集团有限公司科技项目(HNKJ20-H43) |
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| Effects of Pack Cementation Aluminizing and Vapor Aluminizing on Oxidation Behavior of P92 Steel in Saturated Steam at 650 ℃ |
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Zhou Yongli1,2, Lu Jintao1, Huang Jinyang1, Yang Zhen1, Yuan Yong1, Gu Yuefeng1, Zhao Qinxin2
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1.National Engineering Research Center of Clean Coal Combustion for Utility Boilers, Xi’an Thermal Power Research Institute Co.,Ltd., Xi’an 710032 , China;2.Key Laboratory of Thermal Fluid Science and Engineering of MOE, Xi’an Jiaotong Uni- versity, Xi’an 710049 , China
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| Abstract: |
| Surface aluminizing technology is a cost-effective method which can improve the high-temperature steam oxidation re- sistance of substrate alloys without worsening their mechanical performance. Aluminide coatings were obtained on P92 steel surface by low-temperature pack cementation and vapor aluminizing process. The oxidation behavior of the aluminide coatings in saturated steam at 650 ℃ was investigated by oxidation weight increase method, SEM together with XRD analysis. Results show that the P92 steel has a poor oxidation resistance. A double-layered oxide scales consisting of nodular-typed Fe-rich outer layer and FeCr2O4 in- ner layer formed on P92, and the outer Fe-rich oxide film begin to peel off after 300 h. As for low-temperature pack cementation a- luminizing, a thin β-FeAl layer grows on P92 steel, and an extremely thin (<0. 2 μm) protective α-Al2O3 scale forms on β-FeAl layer. A single Fe3Al layer forms after vapor aluminizing. A mixed oxides conpose of an outer Fe3O4+Fe2O3 of about 1. 3 μm and an inner Al2O3 scale after 500 h oxidation. Aluminide coatings prepared on P92 steel through both low-temperature pack cementa- tion and vapor aluminizing process can improve the steam oxidation resistance of P92 steel significantly. |
| Key words: P92 aluminide coating pack cementation aluminizing vapor aluminizing steam oxidation inner diffusion |