热障涂层TGO热生长和TC烧结强化模拟

Modeling of TGO thermally growing and TC sintering for thermal barrier coatings

为模拟涡轮叶片热障涂层在不均匀温度场作用下热生长氧化层（TGO）的热生长和陶瓷面层（TC）的烧结强化,采用时间和温度相关的TGO热生长模型,建立TC烧结强化的增量本构模型,并通过ABAQUS子程序CREEP和UMAT予以实现.结果表明：发生显著TGO增厚和TC弹性模量强化的区域与不均匀温度场的高温区域相符合.在0-200 h内,TC最大弹性模量增大了74.567 GPa,并使得叶盆和叶背中后部TC热应力水平明显增大;TGO最大厚度增加了2.29μm,使得周向和径向抵抗热失配的承载截面增大,降低了TGO热应力水平;而TGO热生长和TC烧结对粘结层（BC）和合金材料的热应力几乎没影响.

To perform modeling of thermally grown oxide（TGO） thickening and top coating（TC） sintering,the time-and-temperaturedependent models of TGO were adopted,and the incremental constitutive model of TC was established.Both processes were realized by ABAQUS subroutines CREEP and UMAT.Results show that TGO growing and TC sintering are consistent with the hotter zones of turbine vane.From 0-200 h,the max modulus of TC is increased by 74.567 GPa,and it results in higher thermal stress in posterior of the suction side and pressure side.Simultaneously,the max thickness of TGO is increased by 2.29 μm,which enlarges the section area for sustaining the thermal expansion mismatch in hoop and radial direction,reducing the thermal stress of TGO.TGO growing and TC sintering may have little action on bond coating（BC） and alloy materials.