(南京航空航天大學(xué) 機(jī)電學(xué)院，南京 210016)
摘 要: 將納米粒子團(tuán)聚大顆粒進(jìn)行抽象處理，提出以理想堆垛結(jié)構(gòu)為假設(shè)的納米團(tuán)聚顆粒模型。以ANSYS有限元軟件為平臺(tái)，模擬Al2O3-13%TiO2(質(zhì)量分?jǐn)?shù))團(tuán)聚納米顆粒在熱噴涂環(huán)境下的傳熱過程，分析傳熱時(shí)間、團(tuán)聚顆粒直徑和孔隙率等對(duì)傳熱的影響, 并分析團(tuán)聚顆粒在熱噴涂傳熱后的組織結(jié)構(gòu)差異。結(jié)果表明：在一定傳熱條件下，納米團(tuán)聚顆粒可以保持部分納米粒子或長大為亞微米晶形態(tài)，且團(tuán)聚顆粒直徑越大，這類組織就越容易形成，而團(tuán)聚顆粒孔隙率在0.48以下時(shí)，對(duì)組織形態(tài)的影響較弱。
關(guān)鍵字: 納米團(tuán)聚顆粒; 傳熱; 熱噴涂; 數(shù)值分析
heat transfer numerical analysis under thermal spraying conditions
（College of Mechanical and Electronic Engineering,
Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China）
Abstract:According to the agglomerated structure of nano-particles, a novel assumption structure model based on ideal stacking structure was proposed. The temperature field of agglomerated structure Al2O3-13%TiO2 (mass fraction) particle under thermal spraying conditions was simulated by using the finite element analysis tool of ANSYS. The influence of heat transfer time, agglomerated particle diameter and porosity were separately analyzed. The differences in microstructure were also experimentally analyzed after heat transfer in the thermal spraying. The results confirm that, under certain heat transfer conditions, the agglomerated nano-particles can be partially maintained or grow into sub-micron crystal. And the larger the diameter of agglomerated particle is, the easier the formation of such organization is. In addition, the influence of the porosity becomes weak when it is below 0.48.
Key words: agglomerated nano-particles; heat transfer; thermal spraying; numerical analysis
