Single crystal Ni-based superalloys DD3 and nanolaminated ternary ceramics Ti₃AlC₂ were the critical high-temperature structural materials, so the bonding of them is of great significance in promoting their potential applications at elevated temperatures. A strong DD3/Ti₃AlC₂ joint with the average shear strength of 86.4 MPa was obtained by vacuum diffusion bonding using the Ni interlayer at 900 °C for 60 min. The joint microstructure and its formation mechanism were investigated in detail. Especially, the role of Ni diffusion in the process of forming a mixed phase zone at the Ti₃AlC₂ interface was clarified. The diffusion zone adjacent to the DD3 was mainly composed of (Ni)_ss, where Al and Ti existed mainly in the form of solid solution. In contrast, a more complex diffusion process occurred at the Ti₃AlC₂ interface. A Ni₃Al single layer and a mixed phases zone, containing Ni₃Al, AlNi₂Ti and TiC, were formed from the Ni interlayer to the Ti₃AlC₂ substrate. Ni had a strong tendency to diffuse along grain boundaries of the Ti₃AlC₂ substrate, leading to the decomposition of its nanolaminated structure. Along with inward-diffusion of Ni, the Ni₃Al phase was mainly formed, and a small amount of AlNi₂Ti and TiC were also formed.

单晶镍基高温合金DD3和纳米叠层三元陶瓷Ti ₃ AlC ₂是关键的高温结构材料，因此它们的结合对于促进其在高温下的潜在应用具有重要意义。通过使用Ni夹层在900°C下真空扩散粘结60分钟，获得了平均剪切强度为86.4 MPa的强DD3 / Ti ₃ AlC ₂接头。详细研究了接头的微观结构及其形成机理。特别地，阐明了Ni扩散在Ti ₃ AlC ₂界面处形成混合相区的过程中的作用。与DD3相邻的扩散区主要由（Ni）组成_ss，其中Al和Ti主要以固溶体形式存在。相反，在Ti ₃ AlC ₂界面发生了更复杂的扩散过程。从Ni中间层到Ti ₃ AlC ₂衬底形成Ni ₃ Al单层和包含Ni ₃ Al，AlNi ₂ Ti和TiC的混合相区。Ni具有沿Ti ₃ AlC ₂衬底的晶界扩散的强烈趋势，导致其纳米层状结构的分解。随着Ni向内扩散，主要形成Ni ₃ Al相，并且少量AlNi _2形成。还形成了Ti和TiC。