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《Materials Science and Technology》 2012-02
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Effect of thermal conduction on thermal insulation of double-ceramic-layer thermal barrier coatings

ZHOU Guo-dong,CHEN Shu-hai,HUANG Ji-hua,ZHAO Xing-ke,ZHANG Hua(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)  
To design structure of double-ceramic-layer thermal barrier coatings,the effect of conductivity of double ceramic during preparation and working on thermal insulation was considered,and the translucent mathematical model was established.Steady thermal insulation was simulated by ANSYS software.The results show that when the conductivity of top ceramic increases,thermal insulation of double-ceramic-layer thermal barrier coatings decreases.The more the thickness of top coat is,the more the thermal insulation decreases.When the conductivity of the second layer increases,the thermal insulation decreases,and as the thickness of top coat increases,the decrease value of the thermal insulation decreases.When ceramic is translucent and the extinction coefficient is very small,the thermal insulation first increases fast and then slowly,and keeps unchanging or a little reduction,but much lower than that of opaque.The change of conductivity of top ceramic layer plays a larger role than that of the second ceramic layer in thermal insulation.
【Fund】: 国家重点基础研究发展计划资助项目(61311203B)
【CateGory Index】: TG174.4
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