引用本文:丁坤英,李志远,王者,程涛涛.基于分形方法的YSZ热障涂层有效热导率分析[J].中国表面工程,2020,33(3):104~110
Ding Kunying,Li Zhiyuan,Wang Zhe,Cheng Taotao.Analysis of YSZ Effective Thermal Conductivity Based on Fractal Theory[J].China Surface Engineering,2020,33(3):104~110
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基于分形方法的YSZ热障涂层有效热导率分析
丁坤英, 李志远, 王者, 程涛涛
中国民航大学 天津市民用航空器适航与维修重点实验室, 天津 300300
摘要:
陶瓷基热障涂层具有优异的阻热性能、耐热腐蚀性能以及热稳定性能,在航空发动机热端部件中广泛使用。 利用大气等离子喷涂方法制备 ZrO2-8%Y2O3(YSZ)涂层,利用聚苯酯(PHB)调节涂层的孔隙形态和含量,利用扫描电镜(SEM)和图像软件分析涂层的截面形貌,计算了孔隙的分形维数,建立了基于分形维数的有效热导率计算方法,优化了热导率与涂层孔隙的定量关系。 同时利用导热仪测量面层的热导率,对有效热导率计算结果进行验证。 结果表明: YSZ 粉末中混合聚苯酯粉末可增加涂层中的孔隙含量;当 PHB 的质量含量达到 15%时,涂层孔隙率可增加至 30%左右。 较高的喷涂功率会形成扁平化的孔隙,孔隙分形维数的取值在 1~ 2,并且孔隙越扁平取值越大。 孔隙含量越大、形态越趋近于扁平化,涂层有效热导率越小。 把孔隙的分形维数引入到有效热导率的计算中,使得计算结果更加趋近于实测结果。
关键词:  大气等离子喷涂  陶瓷基热障涂层  ZrO2-8%Y2O3  分形方法  有效热导率
DOI：10.11933/j.issn.1007-9289.20190909001
分类号:TG174
文章编号:1007-9289(2020)03-0104-07
文献标识码:A
基金项目:国家自然科学基金(51501222)； 民航局科技项目(MHRD20160106)
Analysis of YSZ Effective Thermal Conductivity Based on Fractal Theory
Ding Kunying, Li Zhiyuan, Wang Zhe, Cheng Taotao
Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300 , China
Abstract:
Ceramic-based thermal barrier coatings are widely used in aeroengine hot-stage components since their excellent thermal resistance, hot corrosion resistance, and thermal stability. In the current paper, ZrO2-8%Y2O3 (YSZ) as a kind of thermal barrier coating was deposited by atmospheric plasma spraying method. The morphology and porosity of the coating were adjusted by adding poly-hydroxybutyrate ( PHB). The coating cross-sections were observed by scanning electron microscopy ( SEM). A calculation formula of effective thermal conductivity based on the fractal dimensions of pores in the coating was estab- lished. Meanwhile, the calculation values were verified by a thermal conductivity meter. The results show that the porosity of the coating can be increased by mixing PHB powder and go up to about 30% as the mass fraction of PHB reaches 15%. The higher spraying power has a trend to generate the flat pores with larger fractal dimensions, resulting in the smaller effective thermal con- ductivity of the coating. The fractal dimension of pores is introduced into the calculation of effective thermal conductivity, which makes the calculated results more close to the measured ones.
Key words:  atmospheric plasma spraying  ceramic-based thermal barrier coating  ZrO2-8%Y2O3  fractal theory  effective thermal conductivity
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