A comprehensive review of thermally sprayed abradable sealing coatings:Focusing on abradability  

作　　者：Jingqi HUANG Xueqiang CAO Wenbo CHEN Xiaojun GUO Min LI Wenjun WANG Shujuan DONG Li LIU Meizhu CHEN 

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China [2]AECC Hunan Power Machinery Research Institute,Zhuzhou 412002,China

出　　处：《Chinese Journal of Aeronautics》2024年第10期1-25,共25页中国航空学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos.U2241238,52275461,and 92060201);the Major Program(JD)of Hubei Province,China(No.2023BAA003);the Key Research and Development Program of Hubei Province,China(No.2023BAB107).

摘　　要：Modern aero and stationary gas turbine engines have been designed with much higher compressor-pressure ratios and thrust-weight ratios than earlier models,and these ratios are strongly influenced by the hot-running clearances between the rotating and stationary components.The main benefit of reduction in the clearances is efficiency gains,resulting in lowered fuel consumption and polluting gas emissions,with ecological and economic advantages.However,at these undersized clearances,some rubbing interactions are unavoidable,which can be accommodated by applying Abradable Sealing Coatings(ASCs)on the stationary inner surface.This paper reviews the commercially available abradable materials for thermal spraying at various application positions and temperatures.Emphasis is placed on the abradability and wear mechanisms involved.In addition,considering the tendency of SiC/SiC ceramic matrix composites replacing superalloys as hot section components,the future prospect of ceramic abradables based on Environmental Barrier Coatings(EBCs)in turbine stages is summarized and a new concept of"self-degradable ceramics"based on the corrosive steam environment is proposed for the purpose of high-temperature fillerfree abradables.

关 键 词：Abradable sealing coatings Clearance control systems Thermal spraying Ceramic matrix composites Gas turbine engines 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程] TK475[动力工程及工程热物理—动力机械及工程]