Mechanical properties and oxidation behaviour of plasma sprayed functionally graded zirconia-alumina thermal barrier coatings
Mechanical properties and oxidation behaviour of plasma sprayed functionally graded zirconia-alumina thermal barrier coatings
复制标题
等离子喷涂功能梯度氧化锆-氧化铝热障涂层的机械性能和氧化行为
DOI：
10.1016/j.matchemphys.2007.02.066
复制
发表时间：
2007
影响因子：
4.6
通讯作者：
A. Kobayashi
中科院分区：
文献类型：
--
作者：
G. Shanmugavelayutham;A. Kobayashi
热喷涂涂层的微观结构通常包含工艺相关的缺陷，如球形孔、层间孔、裂纹（在陶瓷的情况下）等。孔隙率是微观结构中的普遍特征，并影响各种涂层性能，如弹性模量、导热性和介电行为。本研究旨在改进图像分析（IA）作为表征热喷涂涂层孔隙率的可靠方法。研究了用气体隧道型等离子喷涂制备的部分稳定氧化锆（PSZ）、氧化铝和氧化锆-氧化铝复合涂层热障涂层的显微结构定量分析方法的通用性。这项研究证实了图像分析的适用性，作为一个简单的，通用的，可靠的和廉价的方法，孔隙度分析同意涂层质量和维氏硬度的影响。本文还讨论了Al_2O_3涂层的热行为和高温抗氧化性的界面处相比，复合涂层。优选该中间层以使γ-Al 2 O3向α-Al 2 O3的相变的有害影响最小化。
The microstructures of thermally sprayed coatings usually incorporate process-dependent defects such as globular pores, interlamellar pores, cracks (in case of ceramics), etc. Porosity is a prevalent feature in the microstructure and affects various coating properties such as elastic modulus, thermal conductivity and dielectric behaviour. This study is conducted to improve the image analysis (IA) as a reliable method for characterization of porosity in thermally sprayed coatings. The versatility of IA methods for microstructural quantification has been investigated for TBCs deposited with partially stabilized zirconia (PSZ), alumina and zirconia–alumina composite coatings by gas tunnel type plasma spraying. This study confirms the applicability of image analysis as a straightforward, versatile, reliable and inexpensive method for porosity analysis agreed with coating qualities and the influences of the Vickers hardness. The paper also discusses the thermal behaviour and high temperature oxidation resistance of the Al2O3coatings as compared to composite coatings at the interface. This interlayer is preferred to minimize the detrimental effect of phase transformation of γ-Al2O3to α-Al2O3.