Bimodal TBCs with low thermal conductivity deposited by a powder-suspension co-spray process

作     者：Wei-Wei Zhang Guang-Rong Li Qiang Zhang Guan-Jun Yang Guo-Wang Zhang Hong-Min Mu 

作者机构：State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Materials Science and EngineeringChang'an UniversityXi'an 710064China Institute of Publication ScienceChang'an UniversityXi'an 710064China AECC Beijing Institute of Aeronautical MaterialBeijing 100095China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2018年第34卷第8期

页      面：1293-1304页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 09[农学] 

基　　金：supported by the National Basic Research Program of China(No.2013CB035701) the Fundamental Research Funds for the Central Universities the National Program for Support of Top-notch Young Professionals 

主　　题：Thermal barrier coatings Aspect ratioBimodal microstructure Thermal conductivity Co-spray process 

摘      要：Advanced thermal harrier coatings （TBCs） with better thermal barrier performance are required by both advanced gas turbine and air engine. In this work, novel bimodal TBCs with low thermal conductivity were deposited and characterized by a novel co-spray approach with both solid powder and suspension. Experimental and finite element analyses were used to optimize the process parameters to prepare the specific morphology nanostructure features. With a comprehensive understanding on the influence of spraying parameters on the morphology ofnano-particles, homogeneous nano-particle heaps with a large aspect ratio were introduced to conventional layered coatings by plasma co-spraying with suspension and solid powder. Co-sprayed bimodal microstructure composite coatings resulted from both wet suspension droplets and molten particle droplets exhibited low thermal conductivity. The thermal conductivity of the composite coating was 1/5 lower than that of the counterpart coatings by conventional plasma spraying with solid powder. This study sheds light to the structural tailoring towards the advanced TBCs with low thermal conductivity.