Comparison of microstructure and mechanical properties of plasma-sprayed nanostructured and conventional yttria stabilized zirconia thermal barrier coatings
Comparison of microstructure and mechanical properties of plasma-sprayed nanostructured and conventional yttria stabilized zirconia thermal barrier coatings
复制标题
DOI：
10.1016/j.ceramint.2013.04.068
复制
发表时间：
2013-12
影响因子：
5.2
通讯作者：
R. Ghasemi;R. Shoja-Razavi;R. Mozafarinia;H. Jamali
中科院分区：
文献类型：
--
作者：
R. Ghasemi;R. Shoja-Razavi;R. Mozafarinia;H. Jamali
本论文的主要目的是评价和比较等离子喷涂纳米结构热障涂层和常规热障涂层的微观结构和力学性能。为此，采用大气等离子喷涂(APS)技术在Inconel738LC衬底上制备了NiCrAlY粘结层、纳米结构涂层和常规YSZ涂层。通过纳米压痕和结合强度测试对涂层的力学性能进行了评价。用场发射扫描电子显微镜(FESEM)和X射线衍射仪(X射线衍射仪)对涂层的组织和物相组成进行了表征。纳米YSZ涂层中既有残留在粉末中的纳米颗粒，也有粉末熔融部分再结晶形成的微柱状颗粒，而常规YSZ涂层的组织结构只由柱状晶片组成。纳米结构涂层的相组成为不可相变的四方相，而常规涂层中同时存在单斜相和不可相变的四方相。纳米压痕和结合强度测试结果表明，纳米结构涂层的力学性能优于常规涂层。
The main goal of this paper was to evaluate and compare the microstructure and mechanical properties of plasma-sprayed nanostructured and conventional yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs). To this end, NiCrAlY bond coat, nanostructured, and conventional YSZ coatings were deposited on Inconel 738LC substrate by atmospheric plasma spraying (APS). The mechanical properties of the coating were evaluated using nanoindentation and bonding strength tests. The microstructure and phase composition of the coating were characterized by field emission scanning electron microscopy (FESEM) and X-ray diffractometry (XRD). The nanostructured YSZ coating contained both nanosized particles retained from the powder and microcolumnar grains formed through the resolidification of the molten part of the powder, whereas the microstructure of the conventional YSZ coating consisted of columnar grain splats only. The phase composition of the as-sprayed nanostructured coating consisted of the non-transformable tetragonal phase, while the conventional coating showed the presence of both the monoclinic and non-transformable tetragonal phases. The results of nanoindentation and bonding strength tests indicated that the mechanical properties of the nanostructured coating were better than those of the conventional coating.