晶须增韧等离子喷涂陶瓷涂层的可控制备与热力学性能研究  

Study on the Controlled Preparation and Thermal-Mechanical Properties of Plasma Sprayed Ceramic Coatings with Whiskers Toughness

作　　者：王玉 胡永宝 柳琪 于方丽 白宇 Wang Yu;Hu Yongbao;Liu Qi;Yu Fangli;Bai Yu(School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Materials Engineering,Xi’an Aeronautical University,Xi’an 710077,China)

机构地区：[1]西安交通大学材料科学与工程学院,陕西西安710049 [2]西安航空学院材料工程学院,陕西西安710077

出　　处：《稀有金属材料与工程》2022年第5期1741-1751,共11页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52005388);国家重点研发计划(2018YFB2004002);中国博士后基金(2019M653598);陕西省自然科学基金(2019TD-020,2019JQ-586,2020JM-631)。

摘　　要：针对新一代航空发动机和重型燃气轮机对长寿命、高韧性热障涂层的迫切需求,通过喷雾造粒法制备了长径比为10的ZrO_(2)晶须复合YSZ喷涂粉末,采用超音速等离子喷涂(SAPS)技术制备了YSZ/ZrO_(2)晶须增韧陶瓷复合涂层,对复合涂层的工艺参数进行优化,研究了熔融指数对陶瓷复合涂层微观结构的影响规律;通过狭缝法收集单个摊片的实验,阐明了ZrO_(2)晶须增韧YSZ陶瓷涂层的形成机理,建立了晶须增韧陶瓷涂层的微观结构与热力学性能间的内在关系。基于晶须弥散分布于复合涂层未熔颗粒区的特征,相比纳米结构YSZ涂层,YSZ/ZrO_(2)晶须增韧陶瓷复合涂层的断裂韧性与热循环寿命均提高1倍。The thrust is derived from the urgent demand by the development of next-generation of aircraft engines and heavy-duty gas turbines for high performance(eg.long life,high toughness)TBCs.In this research,the ZrO_(2) whisker modified YSZ composite powder with an aspect ratio of 10 was firstly prepared by spray granulation method.Then a type of YSZ/ZrO_(2) composites coatings were prepared by supersonic atmospheric plasma spraying(SAPS)technology.The spraying parameters of YSZ/ZrO_(2) composites coatings were optimized,and the influence of the melt index on the microstructure of the composite coating was also studied.Besides,an experiment of the splat collecting through V-shaped slit method was carried out to clarify the formation mechanism of the whisker toughened YSZ ceramic coatings.Finally,the internal relationship between the microstructure and mechanical properties of YSZ/ZrO_(2) composites coatings was established.Based on the feature of the whiskers uniformly dispersed in the unmelted nano-particle region of composite coating,the fracture toughness and thermal cycle life of YSZ/ZrO_(2) composite coating increase by twice compared to the nanostructured YSZ coating.

关 键 词：热障涂层 晶须 增韧 超音速等离子喷涂 热力学性能 

分 类 号：TG174.442.1[金属学及工艺—金属表面处理]