Preparation and performance of thermal barrier coatings made of BNw-containing modified Nd2O3-doped yttria-stabilized zirconia
Preparation and performance of thermal barrier coatings made of BNw-containing modified Nd2O3-doped yttria-stabilized zirconia
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DOI：
10.1016/j.ceramint.2019.08.289
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发表时间：
2020
影响因子：
5.2
通讯作者：
Tian Haoliang;Jin Guo;L. Erbao;W. Fuyuan;Wang Changliang;G. Mengqiu;Gao Junguo;Cui Yongjing
中科院分区：
文献类型：
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作者：
Tian Haoliang;Jin Guo;L. Erbao;W. Fuyuan;Wang Changliang;G. Mengqiu;Gao Junguo;Cui Yongjing
为提高热障涂层的断裂韧性和抗热震性能，采用爆轰喷涂技术制备了含20Ⅲ%(d1涂层)和30 %(d2涂层)氮化硼晶须(BNWS)的掺Nd2氧化物(Nd2)改性氧化锆(YSZ)热障涂层。利用扫描电子显微镜(SEM)、X射线衍射仪(X射线衍射仪)、能谱仪(EDS)和显微硬度计分析了不同稀土氧化物掺杂量对涂层形貌、成分和力学性能的影响。结果表明，D2涂层的孔隙率比D1涂层高47.9%，晶须含量分别为30 Vol%和20 Vol%。孔隙率的增加降低了涂层的显微硬度和结合强度。而D2涂层的断裂韧性提高到2.67 Mpa·m1/2，这是因为D2涂层中晶须含量比D1涂层高8.5%。D2涂层的热循环寿命为245次，其抗热震性比D1涂层提高9.9%。当BNW为30 VOL%时，可获得综合性能较好的热障涂层。
To enhance the fracture toughness and thermal shock resistance of the thermal barrier coatings (TBCs), detonation spraying has been used to prepare modified neodymium (Ⅲ) oxide (Nd2O3)-doped yttria-stabilized zirconia (YSZ) TBCs containing 20 vol% (D1 coating) and 30 vol% (D2 coating) of boron nitride whiskers (BNws). Analyses were performed using a scanning electron microscope (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and a microhardness tester to examine the manner in which the doping content of different rare earth oxides affected the coating morphology, composition, and mechanical properties. The results denoted that the porosity of the D2 coating was 47.9% higher than that of the D1 coating; the whisker content was 30 vol% in the former and 20 vol% in the latter. The increased porosity reduced the microhardness and bond strength of the coating. However, the fracture toughness (KIC) of the D2 coating was increased to 2.67 MPa·m1/2because the whisker content was 8.5% higher than that in the D1 coating. The thermal cycling life of the D2 coating was 245 cycles, and its thermal shock resistance was 9.9% higher when compared with that of the D1 coating. A TBC with better overall performance was obtained when BNw reached 30 vol%.