采用 5 k W连续 CO2 激光器对经等离子喷涂的 Ni Co Cr Al Y结合层和 Zr O2 陶瓷层进行二次重熔处理 ,并利用金相显微镜、扫描电镜和电子探针对激光熔敷涂层进行了显微结构和元素分布观察与测试。结果表明 :激光熔敷涂层中基体对 Ni Co ...采用 5 k W连续 CO2 激光器对经等离子喷涂的 Ni Co Cr Al Y结合层和 Zr O2 陶瓷层进行二次重熔处理 ,并利用金相显微镜、扫描电镜和电子探针对激光熔敷涂层进行了显微结构和元素分布观察与测试。结果表明 :激光熔敷涂层中基体对 Ni Co Cr Al Y合金层产生稀释 ,形成成分和组织偏析。加入了 Ti O2 - Al- Ti添加剂的 Zr O2 陶瓷层激光重熔后得到了无裂纹的定向生长柱状晶 ,并且呈现一次枝晶平均间距为 2 .3μm的表层和平均间距为 3.展开更多
Multiple surface cracks and interfacial delamination are the major failure mechanisms in film/substrate systems.The effect of interlayer upon the failure mechanisms of interfacial delamination concomitant to surface c...Multiple surface cracks and interfacial delamination are the major failure mechanisms in film/substrate systems.The effect of interlayer upon the failure mechanisms of interfacial delamination concomitant to surface crack was explored.Finite element model was developed to obtain the stress and energy release rate(ERR),which governs the propagation of interface cracks.The dependences of delamination upon the geometry and constitutive properties of interlayer were examined.The results indicate that the effect of elastic modulus of interlayer on the steady state ERR is insignificant.In cases of different geometrical parameters,however,the steady ERR decreases with the increase of the interlayer thickness.These findings lead to the conclusion that the interlayer constraint has significant effect on the ERR and thus coating life,which can be adopted to modify the ceramic top coat.展开更多
文摘采用 5 k W连续 CO2 激光器对经等离子喷涂的 Ni Co Cr Al Y结合层和 Zr O2 陶瓷层进行二次重熔处理 ,并利用金相显微镜、扫描电镜和电子探针对激光熔敷涂层进行了显微结构和元素分布观察与测试。结果表明 :激光熔敷涂层中基体对 Ni Co Cr Al Y合金层产生稀释 ,形成成分和组织偏析。加入了 Ti O2 - Al- Ti添加剂的 Zr O2 陶瓷层激光重熔后得到了无裂纹的定向生长柱状晶 ,并且呈现一次枝晶平均间距为 2 .3μm的表层和平均间距为 3.
基金Project(2013CB035700) supported by the National Basic Research Program of ChinaProjects(11272259,11321062,11002104) supported by the National Natural Science Foundation of China
文摘Multiple surface cracks and interfacial delamination are the major failure mechanisms in film/substrate systems.The effect of interlayer upon the failure mechanisms of interfacial delamination concomitant to surface crack was explored.Finite element model was developed to obtain the stress and energy release rate(ERR),which governs the propagation of interface cracks.The dependences of delamination upon the geometry and constitutive properties of interlayer were examined.The results indicate that the effect of elastic modulus of interlayer on the steady state ERR is insignificant.In cases of different geometrical parameters,however,the steady ERR decreases with the increase of the interlayer thickness.These findings lead to the conclusion that the interlayer constraint has significant effect on the ERR and thus coating life,which can be adopted to modify the ceramic top coat.
