抗剥落金属基可磨耗封严涂层结构匹配制备研究

刘光磊, 石秋生, 李广荣, 杨冠军

doi:10.16577/j.issn.1001-1560.2023.0169

材料保护 >

2023 , Vol. 56 >Issue 7: 110 - 118

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0169

工艺探讨

抗剥落金属基可磨耗封严涂层结构匹配制备研究

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西安交通大学金属材料强度国家重点实验室，陕西西安 710049

杨冠军(1977-)，博士，教授，研究方向为表面涂层与薄膜技术、太阳电池、先进能源材料，电话: 029-82665299，E-mail: ygj＠mail.xjtu.edu.cn

收稿日期: 2023-01-26

修回日期: 2023-02-15

录用日期: 2023-03-16

网络出版日期: 2023-08-23

基金资助

国家科技重大专项(2017-VII-0012-0107)资助

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Study on Structure-Matching Preparation of Spalling-Resistant Metal-Based Abradable Seal Coatings

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State Key Laboratory for Mechanical Behavior of Materials，Xi’an Jiaotong University，Xi’an 710049，China

Received date: 2023-01-26

Revised date: 2023-02-15

Accepted date: 2023-03-16

Online published: 2023-08-23

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摘要

新一代航空发动机对推重比提出更高的要求，而发动机叶尖与机匣的间隙是影响发动机效率的关键因素之一。在机匣内壁制备可磨耗封严涂层能有效减小气流泄漏、避免叶尖与机匣碰磨，从而使发动机高效、安全地运行。可磨耗封严涂层通常具有高孔隙率，然而高孔隙率易降低可磨耗面层/陶瓷隔热层界面强度，引发可磨耗涂层整体剥落。为此，开展可磨耗封严面层/陶瓷隔热层界面结构匹配设计，在保证涂层可磨耗封严功能的基础上，增强二者界面抗剥落能力。首先，通过数值分析方法发现，可磨耗层/陶瓷层界面处孔隙特征尺寸和孔隙率增加均会加剧可磨耗层沿界面剥落的风险。进一步，提出可磨耗封严涂层的结构匹配设计，即在靠近界面处增加抗剥落过渡层。最后，通过模拟和试验相结合，优化抗剥落过渡层厚度，证实过渡层可显著延长体系的服役寿命。

关键词： 结构匹配; 可磨耗封严涂层; 界面强化; 抗剥落过渡层; 长寿命

本文引用格式

刘光磊, 石秋生, 李广荣, 杨冠军 . 抗剥落金属基可磨耗封严涂层结构匹配制备研究[J]. 材料保护, 2023 , 56(7) : 110 -118 . DOI: 10.16577/j.issn.1001-1560.2023.0169

Abstract

The new generation of aero-engines has higher requirements for thrust-to-weight ratios，and the clearance between the blade-tip and the engine casing is one of the key factors affecting the efficiency of the engine.Preparing abradable seal coatings on the inner wall of the casing can effectively reduce airflow leakage and prevent the tip from rubbing against the casing，thus enable the engine to operate efficiently and safely.Abradable seal coatings usually have high porosity.However，high porosity tends to reduce the strength of the abradable layer/ceramic thermal barrier layer interface，leading to the overall spalling of the abradable coating.Therefore，the structure-matching design of abradable seal layer/ceramic thermal barrier layer interface was conducted.On the basis of ensuring the abradable seal function of the coating，while enhancing the spalling resistance at interface between the two.Firstly，numerical analysis showed that the increase in pores characteristic size and porosity at the interface of the abradable layer/ceramic layer would increase the spalling risk of the abradable layer along the interface.Secondly，a structure-matching design for the abradable seal coating was proposed，which involved adding a spalling-resistant transition layer near the interface.Finally，the combination of simulations and tests was carried out to optimize the thickness of the spalling-resistant transition layer，which confirmed that the transition layer could significantly improve the service life of the system.

Key words： structure-matching；abradable seal coating; interface reinforcement; spalling-resistant transition layer; long life

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