严苛环境下氧化铝/可伐合金组件性能演变与界面优化设计研究

In consideration of the urgent demand of high-end equipment for high-performance structural-functional integrated ceramic/metal composite components, this project is focused on realization of the performance improvement and reliability control of composite components by optimizing the design of interfacial microstructures as well as transition zone compositions. Composite components with high reliability capable to withstand harsh environmental for long periods of time will be designed and prepared in this work. Controllable preparation technology of the alumina/kovar alloy components will be also developed. Performance evolution and optimization design of the alumina/kovar alloy components interface under harsh environment are planned to be assessed. The study includes the following three aspects. First, controllable preparation technology of integrated sintering for composite components will be developed through clarify relationship between the process parameters with connection performance and controlling of sintering process accuracy of the integrated technology. Second, the evolution and performance degradation mechanism of interfaces will be suggested based on the investigation of failure behavior and degradation processes of components prepared by integrated technology under a simulative harsh service environment. A proposal for the optimization design of interface of composite components will be then proposed. Last, we will study how interfacial microstructure parameters and transition zone compositions affect interface reliability performance of the components, and further to establish principles and methods to regulate interfacial performance as well as to control reliability of the fabricated components. This project will enrich and develop preparation methods for ceramic/metal joints. It will also provide theoretical basis and technical support for understanding and solving problems associated with interfacial failure in harsh conditions with the final goal to improved reliability of resulting composite components.

针对国家高端装备对高性能结构-功能一体化陶瓷/金属复合组件的迫切需求，本项目拟通过对界面微结构与过渡区组分的优化设计来实现复合组件的性能提升与可靠性控制，发展在苛刻服役环境下具有高可靠性、长寿命的陶瓷/金属复合组件及其可控制备技术。开展氧化铝/可伐合金复合组件的性能演变及界面优化设计研究，主要包括三个方面：其一、通过一体化制备工艺精度的控制研究，明确复合组件界面性能与工艺参数之间的关系，发展复合组件的一体化可控制备技术；其二、考察基于一体化工艺制备的复合组件在严苛服役环境下的界面失效行为和退化过程，阐明组件界面演变规律和性能退化机制，提出界面优化设计方案；其三、探索界面精细结构和过渡区组分对其界面可靠性能的影响规律，发展界面性能调控及可靠性控制的原理与方法。本研究有助于丰富和发展陶瓷/金属复合组件的制备方法，为解决严苛环境下的界面失效难题和提高复合组件的界面可靠性提供理论依据和技术支持。