Mechanical property evaluation of carbon nanotubes reinforced plasma sprayed YSZ-alumina composite coating
Mechanical property evaluation of carbon nanotubes reinforced plasma sprayed YSZ-alumina composite coating
复制标题
碳纳米管增强等离子喷涂YSZ-氧化铝复合涂层的力学性能评价
DOI：
10.1016/j.ceramint.2018.01.131
复制
发表时间：
2018-04
影响因子：
5.2
通讯作者：
J. G. Thakare;C. Pandey;R. S. Mulik;M. Mahapatra
中科院分区：
文献类型：
--
作者：
J. G. Thakare;C. Pandey;R. S. Mulik;M. Mahapatra
采用空气等离子喷涂(APS)技术制备了8%Y_2O_3稳定的氧化锆(8YSZ)-氧化铝-碳纳米管复合涂层。在相同的工艺参数(500A和66V)下，分别制备了3种不含碳纳米管的复合涂层和含1%碳纳米管、3%碳纳米管的复合涂层。采用压痕法对涂层的力学行为进行了表征。与传统的8YSZ涂层相比，碳纳米管增强复合涂层具有更好的力学性能。Al_2O_3和1%碳纳米管的加入使材料的杨氏模量分别提高了约25%和40%。然而，由于碳纳米管的团聚，碳纳米管含量的增加降低了其杨氏模数。随着氧化铝和碳纳米管的加入，复合材料的硬度、断裂韧性均有所提高。断裂韧性从8YSZ的0.55±0.26 Mpa·m~(1/2)提高到17%Al_2O_3-3%CNT的1.76±0.65 Mpa·m~(1/2)，这是由于裂纹偏转、桥联等多种增韧机制造成的，压头的最大位移从常规YSZ涂层的~176 nm降到了3%CNT增强涂层的~120 nm。表面粗糙度(Ra)随氧化铝的加入和碳纳米管增强涂层的增加而降低。碳纳米管增强涂层的表面粗糙度约为6µm，用扫描电子显微镜(SEM)和能谱仪(EDS)分别对涂层的微观结构和元素组成进行了表征。
Yttria (8%) stabilized zirconia (8YSZ)-alumina-carbon nanotube (CNT) composite coatings were deposited using air plasma spray (APS) technique. Three zirconia alumina (ZA) composite coatings, without CNT reinforcement, and with 1%CNT, 3%CNT reinforcement were deposited using identical process parameters (500 A and 66 V). Indentation method was used to characterize mechanical behavior of coatings. The CNT reinforced composite coating showed superior mechanical properties as compared to the conventional 8YSZ coating. The addition of alumina and 1%CNTs increased the Young's modulus by around 25% and 40%, respectively. However, the increase in CNT content decreased the Young's modulus as a result of CNT agglomeration. The hardness, fracture toughness increased with addition of alumina and CNT. The fracture toughness increased from 0.55 ± 0.26 MPa m1/2for 8YSZ to 1.76 ± 0.65 MPa m1/2for 17%alumina-3%CNT reinforcement due to various toughening mechanisms like crack deflection, bridging etc. The maximum displacement of indenter was found to decrease from ~ 176 nm for conventional YSZ coating to ~ 120 nm for 3% CNT reinforced coating. The surface roughness (Ra) was found to be decrease with alumina addition and CNT reinforced coating. The CNT reinforced coating showed surface roughness of around 6 µm. Scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) was used to characterize the coating microstructure and elemental composition respectively.