[1]孙泽睿,董琳,刘梅军,等.多孔结构可磨耗涂层抗氧化性能评价方法[J].中国材料进展,2024,43(09):832-838.[doi:10.7502/j.issn.1674-3962.202209038]
　SUN Zerui,DONG Lin,LIU Meijun,et al.Evaluation Methodology of Oxidation Resistance of Porous Abradable Coating[J].MATERIALS CHINA,2024,43(09):832-838.[doi:10.7502/j.issn.1674-3962.202209038]
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多孔结构可磨耗涂层抗氧化性能评价方法()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
43
期数:
2024年第09期
页码:
832-838
栏目:
出版日期:
2024-09-29

文章信息/Info

Title:
Evaluation Methodology of Oxidation Resistance of Porous Abradable Coating
文章编号:
1674-3962(2024)09-0832-07
作者:
孙泽睿; 董琳; 刘梅军; 杨冠军
西安交通大学材料科学与工程学院 金属材料强度国家重点实验室，陕西 西安 710049
Author(s):
SUN Zerui;  DONG Lin;  LIU Meijun;  YANG Guanjun
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering,Xi‘an Jiaotong University, Xi’an 710049, China
关键词:
封严涂层; 孔隙; 接触面积; 氧化动力学; 抗氧化性
Keywords:
sealing coating;  pore;  contact area;  oxidation kinetics;  oxidation resistance
分类号:
TG174.4
DOI:
10.7502/j.issn.1674-3962.202209038
文献标志码:
A
摘要:
防钛火可磨耗封严涂层的抗氧化性能是决定其服役寿命的重要因素。然而，当涂层呈现孔隙率高达50%量级的多孔结构，经典的氧化增重评价方法不适用。为构建多孔结构涂层抗氧化性能的合理评价方法，以防钛火可磨耗封严涂层为典型的多孔结构合金涂层研究对象，通过系统研究涂层氧化动力学规律、氧化膜分布特征，揭示了多孔结构涂层内表面氧化机制，建立合理考虑涂层实际氧化表面积的多孔结构涂层抗氧化性能评价方法。结果表明，孔隙作为环境氧的快速扩散通道，使涂层与环境氧的接触面积增大2个数量级，导致根据经典氧化增重法所得氧化膜厚度比实际表面氧化膜厚度高2个数量级。据此，通过建模计算包含外表面和内表面的多孔涂层实际氧化面积，构建基于实际氧化表面积的涂层抗氧化评价方法。采用该方法评价NiCrAl膨润土可磨耗封严涂层，得出600 ℃空气氧化条件下该涂层平均氧化速率为18×10-2 g·m-2·h-1，达到标准HB5258—2000规定的完全抗氧化级。上述评价方法为准确评价多孔涂层抗氧化性能从而保障涂层可靠服役提供方法支撑。
Abstract:
Oxidation resistance of the abradable sealing coating is an important factor in determining its service life. However, the sealing coating possesses a porous structure with porosity up to 50%, which makes classical weight gain rate evaluation methods inapplicable. To evaluate the oxidation resistance of porous coating accurately, this work investigated the typical porous abradable sealing coating. First, oxidation kinetics of the coating and distribution of oxide film were systematically studied. Then, an inner surface oxidation mechanism of the porous coating was revealed. Finally, a reasonable method for evaluating the oxidation resistance of porous coating considering the actual oxidized surface area was established. Results showed that pores in the coating served as rapid diffusion channels for oxygen in the environment, significantly increasing in the contact area between the coating and the environment by several orders of magnitude, and an increase in the calculated oxide film thickness by several orders of magnitude than the actual oxide film thickness. Based on this, this work calculated the actual oxidation area by establishing a porous coating model and thus established an evaluation method of the oxidation resistance. According to the proposed evaluation method, the average oxidation rate at 600 ℃ under air condition of NiCrAlbentonite abradable sealing coating prepared in this work was 1.8×10-2 g·m-2·h-1, which had reached the level of complete oxidation resistance based on standard HB5258—2000. The established evaluation method is meaningful for accurately evaluating the oxidation resistance performance of porous coatings to ensure their reliable service.

备注/Memo

备注/Memo:
收稿日期：2022-09-26修回日期：2022-12-06 基金项目：国家科技重大专项（2017-VII-0012-0107） 第一作者：孙泽睿，男，1998年生，硕士研究生 通讯作者：杨冠军，男，1977年生，教授，博士生导师， Email:ygj@mail.xjtu.edu.cn
更新日期/Last Update: 2024-08-29