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 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China [2]School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China [3]Institute of Publication Science,Chang'an University,Xi'an 710064,China [4]AECC Beijing Institute of Aeronautical Material,Beijing 100095,China

出　　处：《Journal of Materials Science & Technology》2018年第8期1293-1304,共12页材料科学技术（英文版）

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

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.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.

关 键 词：Thermal barrier coatings Aspect ratioBimodal microstructure Thermal conductivity Co-spray process 

分 类 号：Q1[生物学—普通生物学]