3~5μm波段低红外发射率热障涂层制备与性能研究  

Preparation and Performance Study of Low Infrared Emissivity TBCs in the 3-5μm Band

作　　者：王攀 毛高翔 段士昌 李倩 柴雍 WANG Pan;MAO Gaoxiang;DUAN Shichang;LI Qian;CHAI Yong(Shaanxi Huaqin Technology Co.,Ltd.,Xi'an 710061,China)

机构地区：[1]陕西华秦科技实业股份有限公司,西安710061

出　　处：《热喷涂技术》2025年第1期130-138,共9页Thermal Spray Technology

基　　金：工业与信息化部先进基础工艺人才项目(MIIT-TYBZ2412150055)。

摘　　要：航空发动机后段高温零部件壁面用于热防护的氧化钇稳定氧化锆热障涂层,在近红外(3~5μm)波段具有较高的红外发射率,为了降低热障涂层红外发射率,实现发动机零部件在近红外波段的隐身功能,同时实现兼具阻隔辐射热和传导热的高效隔热,本文在8YSZ热障涂层基础上,优选Al_(2)O_(3)-ZrO_(2)-Y_(2)O_(3)(AZY)三元陶瓷体系,通过等离子喷涂技术制备了8YSZ/AZY复合低发射率热障涂层,研究了AZY低发射率面层材料配比、厚度和孔隙率对复合涂层红外发射率、结合强度的影响,通过三因素三水平正交试验,确定了大气等离子喷涂AZY低发射率面层工艺参数。试验结果表明:材料配比为0.75Al_(2)O_(3)-0.23ZrO_(2)-0.02Y_(2)O_(3),AZY低发射率面层厚度200μm,孔隙率20%时,采用正交优化后的等离子喷涂参数所制备的复合涂层在3~5μm波段1 000℃下红外发射率可低至0.21,结合强度15.92 MPa,涂层1 100℃水冷热震可达36次。复合涂层在1 000℃高温下3~5μm波段具有较低的红外发射率,涂层可靠性较好,可实现8YSZ隔热层阻隔传导热和AZY低发射率面层阻隔辐射热的综合隔热,同时实现了发动机零部件在近红外波段的红外隐身功能。In order to reduce the infrared emissivity of thermal barrier coatings(TBCs)and achieve near-infrared(3-5μm)stealth functionality for high-temperature components in aeroengine applications,while maintaining efficient thermal insulation by blocking both radiative and conductive heat transfer,this study investigated the development of an 8YSZ/AZY composite low-emissivity TBC.The AZY layer,composed of Al_(2)O_(3)-ZrO_(2)-Y_(2)O_(3),was deposited on an 8YSZ TBC using Atmospheric Plasma Spraying(APS).The effects of AZY material composition,layer thickness,and porosity on the infrared emissivity and bond strength of the composite coating were systematically studied.A three-factor,three-level orthogonal experimental design was employed to optimize the APS process parameters for the AZY low-emissivity topcoat.Results indicate that when the AZY material composition is optimized to 0.75Al_(2)O_(3)-0.23ZrO_(2)-0.02Y_(2)O_(3),with a layer thickness of 200μm and porosity of 20%,the composite coating fabricated using the optimized APS parameters exhibits an infrared emissivity as low as 0.21 at 1000℃in the 3-5μm wavelength range.The coating demonstrates excellent mechanical reliability,with a bond strength of 15.92 MPa and surviving up to 36 water-cooling thermal shock cycles at 1100℃.The composite coating effectively combines the thermal insulation properties of the 8YSZ layer for blocking conductive heat transfer with the low-emissivity characteristics of the AZY layer for reducing radiative heat transfer,achieving near-infrared stealth functionality for engine components under high-temperature conditions.

关 键 词：红外发射率 大气等离子喷涂 孔隙率 散射 

分 类 号：TG174.45[金属学及工艺—金属表面处理]