四方相氧化钇稳定氧化锆热障涂层的热循环和热冲击性能及其失效机理  

Thermal Cycling and Flame Thermal Shocking Failure Mechanism of Tetragonal Yttria-stabilized Zirconia TBCs Prepared on High Temperature Alloys by Suspension Plasma Spraying

作　　者：黄迪 牛云松[1,3] 李帅 董志宏 鲍泽斌[1,2] 朱圣龙 HUANG Di;NIU Yunsong;LI Shuai;DONG Zhihong;BAO Zebin;ZHU Shenglong(Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,Beijing 100083,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新研究中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《材料研究学报》2024年第9期691-700,共10页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51671202和52301116);两机基础中心项目(P2021-A-IV-002-001);国家科技重大专项(J2019-IV-0006-0074);中国科学院重点部署项目(ZDRW-CN-2021-2-2)。

摘　　要：以四方相YSZ粉末为原料用悬浮液等离子喷涂技术制备具有类柱状结构的陶瓷层,研究了其在1100℃热循环和1300℃热冲击的失效行为。结果表明,这种陶瓷层具有优异的抗热循环和抗热冲击性能,且始终保持四方相。这种涂层在热循环和热冲击中的失效机理不同:在热循环过程中,陶瓷层与热生长氧化物之间热膨胀系数不匹配使两者剥离;而在热冲击产生的冷热循环中陶瓷层中的柱间间隙演变为贯穿裂纹并成为热通道,使粘结层严重氧化和热障涂层失效。In this paper,thermal barrier ceramic coatings(TBCs)with columnar-like structure were prepared on high temperature alloys N5 and DZ411 by suspension plasma spraying,using tetragonal yttria stabilization zirconia(YSZ)powder as raw material.The failure behavior of TBCs was assessed by thermal cycling test(i.e.furnace heating to 1100℃ for 60 min.and then air cooling for 10 min.as one cycle),and flame thermal shocking test(i.e.quick flame heating to 1300℃ and then compressed air cooling to below 300℃ as one cycle)respectively.The results show that the coatings have excellent resistance to thermal cycling and flame thermal shocking,and the phase composition of ceramic coatings maintains tetragonal crystallographic structure after all the tests.The failure mechanism of TBCs in thermal cycling and flame thermal shocking is different.Delamination failure occurs at the interface between the ceramic layer and thermal grown oxides(TGO)during thermal cycling,caused by the mismatch of different thermal expansion coefficient.Besides,the main failure source of TBCs during flame thermal shocking is severe internal oxidation of bond coat due to the formation of hot channel,which is converted from gaps between columnar.

关 键 词：材料表面与界面 悬浮液等离子喷涂 热障涂层 热循环 热冲击 失效机理 

分 类 号：TG174.45[金属学及工艺—金属表面处理]