Influence of Atmosphere on Thermal Conductivity of Thermal Barrier Coatings
Influence of Atmosphere on Thermal Conductivity of Thermal Barrier Coatings
复制标题
气氛对热障涂层导热系数的影响
DOI：
10.2963/jjtp.30.176
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
N. Oikawa
中科院分区：
文献类型：
--
作者：
S. Takahashi;M. Akoshima;Takashi Tanaka;Mitsue Ogawa;N. Oikawa
研究了热障涂层用陶瓷面漆在不同气氛下的导热系数，探讨了气氛对陶瓷面漆导热系数的影响。采用等离子喷涂技术制备了几种具有不同微观结构的钛涂层。热导率由热扩散率、比热容和体积密度确定。在空气、氩气、氮气和真空中测量了热扩散率。研究发现，任何TC的热导率都强烈依赖于大气。由于等离子喷涂TC具有与其表面相连的开孔，大气中的气体可以渗透到开孔中。气体的热导率影响TC的热导率。因此，在测量等离子喷涂TC的热导率时，应将气氛作为一个重要因素。
The thermal conductivity of the ceramic top-coat (TC) for thermal barrier coatings was examined in various atmospheres in order to clarify the influence of the atmosphere on its thermal conductivity. Some kinds of TCs with different microstructures were prepared by plasma sprayings. The thermal conductivity was determined from the thermal diffusivity, the specific heat capacity and the bulk density. The thermal diffusivity was measured in air, argon, nitrogen and vacuum. It was found that the thermal conductivity in any TCs depends strongly on the atmosphere. Since the plasma sprayed TC has open pores which are connected to its surface, the gas of the atmosphere can be penetrate into the open pores. The thermal conductivity of the gas affects that of the TC. Therefore, the atmosphere should be considered as an important factor for measuring the thermal conductivity of the plasma sprayed TC.