EB-PVD热障涂层的弹性模量和断裂韧性研究  

Study on Elastic Modulus and Fracture Toughness of an EB-PVD Thermal Barrier Coatings

作　　者：李美姮[1] 胡望宇[1] 孙晓峰[2] 管恒荣[2] 胡壮麒[2] 

机构地区：[1]湖南大学,湖南长沙410082 [2]中国科学院金属研究所金属腐蚀与防护国家重点实验室,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2006年第4期577-580,共4页Rare Metal Materials and Engineering

摘　　要：用压痕法测量EB-PVD热障涂层的弹性模量及断裂韧性。发现热障涂层的Vickers显微硬度和弹性模量随施压载荷增大而减小,当载荷为2.94N时,显微硬度和弹性模量接近稳态值,分别为6.3GPa和172GPa;断裂韧性平均值约为1.81MPa·m1/2。压痕法测得陶瓷层断裂韧性数据波动较大,其主要原因是陶瓷层显微结构不均匀,使压痕裂纹在涂层不同局部区域所遇到的扩展阻力不同。The elastic modulus and fracture toughness of an EB-PVD thermal barrier coatings (TBCs) were evaluated with Knoop and Vickers indentation technique. It is found that the Vickers microhardness and elastic modulus values of the TBCs decrease with increasing indentation load and approach a steady state value of 6.3 GPa and 172 GPa respectively under an indentation load of 2.94 N. The indentation fracture toughness measured for the TBCs at an indentation load of 9.8 N show a large scatter with the average value about 1.81 MPa·m1/2, which could be attributed to the effect of microstructural inhomogeneity on the local crack resistance.

关 键 词：热障涂层 弹性模量 断裂韧性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]