摘要
采用电子束物理气相沉积 ( EB- PVD)方法在 DZ2 2合金基体上沉积制得了由 Ni Co Cr Al Y粘结层和 YSZ( Yt-tria Stabilized Zirconia)陶瓷顶层组成的双层结构的热障涂层。研究了 Ni Co Cr Al Y粘结层表面的喷丸强化处理对热障涂层的抗氧化性能的影响 ,利用 MTS测试了经等温氧化不同时间后的热障涂层内部的结合强度 ,并采用 SEM和XRD观察和分析了涂层的界面结合以及相组成。结果表明 ,等温氧化后热障涂层内部的结合强度急剧降低 ,在拉伸和剪切应力作用下 ,涂层沿着 TGO ( Thermally Grown Oxide)层内部断裂失效 ,强度为 0 .3 MPa的表面喷丸处理能显著提高热障涂层的抗氧化性能和涂层内部 TGO层的结合强度。
A two-layered thermal barrier coating (TBC) consisting of NiCoCrAlY bonding coat and YSZ (yttria stabilized zirconia) topcoat was deposited onto DZ22 alloy using electron beam-physical vapor deposition (EB-PVD). The effect of shot-peening strengthened NiCoCrAlY bonding coat on the resistance to isothermal oxidation of the thermal barrier coating was investigated. The bonding strength of the coating exposed at 1 050 degreesC for different times was evaluated by MTS (materials tensile system), and the interface and phase constituents in the coating was also studied by SEM and XRD. It was found that, the bonding strength of the coating exposed at elevated temperature greatly decreases, and under the conditions of tensile and shear strains; failure of the thermal barrier coating may occur along thermally grown oxide (TGO) layer between the bond coat and YSZ topcoat. Shot-peening with strength of 0.3 MPa can greatly improve bonding strength of thg TGO layer and the resistance to oxidation of the coating.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2001年第4期314-317,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金
国防九五预研项目资助
