Liquid-Film-Assisted Ceramic-Metal Bonding

本研究的目的是确定，检查和理解新的机制，通过这种机制，陶瓷成分可以使用多层金属中间层作为粘合剂连接成复杂的多组分组件。该方法利用液膜辅助连接（LFAJ），利用微观到宏观长度尺度上发生的结构和化学变化，在足够低的温度下实现键合，从而最大限度地减少温度敏感组分的微观结构和性能退化，从而形成传统方法无法实现的材料组合。提出的工作重点是使用Ni/Nb/Ni三层膜连接模型陶瓷-金属组合Al2O3-Nb。在连接过程中，Nb饱和Ni的薄液膜将允许Nb快速传输，并应促进Al2O3-Nb的直接键合。优化LFAJ将需要对三层结构和化学进行微观设计，并剪裁连接表面。该项目将评估这种方法的可行性，并有助于理解和最终控制陶瓷组件之间坚固耐用的键的形成，促进具有任意复杂形状的组件的开发。这项工作将在比以前的研究更复杂的模型系统中建立基本的微观结构-加工-属性关系，为指导LFAJ成功扩展到其他系统提供模板。它将为将大块陶瓷与大块金属连接起来开辟新的途径，并培养研究生和本科生学习日益重要的连接科学，这对运输、医疗、电子和能源行业的材料集成至关重要。出版物和在会议上的发言将把结果传播给更广泛的材料界。

The objective of this study is to identify, examine and understand new mechanisms by which ceramic constituents can be joined into complex multicomponent assemblies using multilayer metallic interlayers as bonding agents. The approach utilizes liquid-film- assisted joining (LFAJ), which exploits structural and chemical changes occurring over microscopic to macroscopic length scales to achieve bonding at temperatures low enough to minimize the microstructural and property degradation of temperature-sensitive components, thereby enabling the formation of material combinations inaccessible by conventional methods. The proposed work focuses on joining a model ceramic-metal combination, Al2O3-Nb, using Ni/Nb/Ni trilayers. During joining a thin liquid film of Nb-saturated Ni will allow rapid Nb transport, and should facilitate direct Al2O3-Nb bonding. Optimizing LFAJ will require microdesign of the trilayer structure and chemistry, and tailoring of the joining surfaces. This project will assess the feasibility of this approach, and contributes to an ability to understand and ultimately control the formation of strong and durable bonds between ceramic components, facilitating the development of assemblies with arbitrarily complex shape.The work will establish fundamental microstructure-processing- property relationships in a more complex model system than prior studies, providing a template to guide successful extension of LFAJ to other systems. It will expose new avenues for joining bulk ceramics to bulk metals, and train graduate and undergraduate students in the increasingly important science of joining that is vital to materials integration in a wide range of transportation, medical, electronic and energy industries. Publications and presentations at meetings will disseminate the results to the broader materials community.