喷距对大气等离子喷涂8YSZ热障涂层组织结构及性能的影响  

Effect of Spray Distance on Microstructure and Properties of Atmospheric Plasma Sprayed 8YSZ Thermal Barrier Coatings

作　　者：李荣斌 程治军 张志玺 LI Rongbin;CHENG Zhijun;ZHANG Zhixi(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Materials,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093 [2]上海电机学院材料学院,上海201306

出　　处：《材料导报》2024年第S02期112-117,共6页Materials Reports

基　　金：国家自然科学基金联合基金重点项目(U23A20607);上海大件热制造工程技术研究中心(18DZ2253400);上海市工业强基专项(GYQJ-2023-1-06)。

摘　　要：利用大气等离子喷涂技术制备了8YSZ热障涂层,并系统探讨了不同喷涂距离对涂层微观结构和性能的影响。对涂层物相及微观结构进行表征,并进行隔热温度测量和热循环寿命测试。结果表明,在80~140 mm的喷距范围内,8YSZ涂层中ZrO_(2)主要以具有较高稳定性的t′相形式存在。厚度与孔隙率呈负相关,低于100 mm喷距时涂层孔隙率逐渐增加,在100 mm喷距处达到16.6%,随后降低到10%左右。高孔隙率和大孔隙尺寸能提升涂层的隔热性能,但是会缩短涂层的热循环寿命,100 mm喷距下隔热温度达到0.534 K/μm,热循环寿命只有231次。结果表明,喷涂距离对8YSZ热障涂层的组织结构和性能的影响具有一定的规律性,因此可以作为调整涂层结构和性能的有效手段。In this work,8YSZ thermal barrier coatings were prepared using atmospheric plasma spraying technology,and the effects of different spraying distances on the microstructure and performance of the coatings were systematically investigated.The phase composition and microstructure of the coatings were characterized,and thermal insulation temperature measurements and thermal cycling life tests were conducted.The results showed that within the spraying distance range of 80-140 mm,ZrO_(2)in the 8YSZ coatings primarily existed in the t′phase,which has higher stability.Thickness and porosity were negatively correlated;porosity gradually increased below a 100 mm spraying distance,reaching 16.6%at 100 mm before decreasing to about 10%.High porosity and large pore size improved thermal insulation but reduced thermal cycling life,with a thermal insulation temperature of 0.534 K/μm and a thermal cycling life of only 231 cycles at a 100 mm spraying distance.The findings indicate that spraying distance has a significant effect on the microstructure and performance of 8YSZ thermal barrier coatings,making it an effective means for adjusting coating structure and performance.

关 键 词：大气等离子喷涂 8YSZ 喷涂距离 孔隙率 

分 类 号：TG174[金属学及工艺—金属表面处理]