切实可行的钻探工艺技术和自动钻探取样机具是实现我国探月工程三期科学目标的关键技术，然而我国尚无超高真空环境钻具表面摩擦损伤基础实验数据积累、相应损伤机理模型和防护机理模型，这必将制约我国对月壤取样钻探工艺的深入认知和取样钻具的优化设计。以实现钛合金钻具在超高真空下的减阻抗磨作用效果为目标，本项目提出在实验室实现超高真空环境下摩擦磨损行为的评价方法，并提出表面纳米化和离子氮化复合的新型表面处理工艺，制备超厚减阻抗磨的硬质陶瓷层。通过多工况的真空摩擦磨损性能评价如改变真空度、模拟月壤条件、对磨副材料、转速和载荷等参数，结合深入的微观结构性能分析，揭示钛合金的表面处理工艺参数——组织结构——力学性能——摩擦学性能——磨损失效的内在关系，最终阐明超高真空环境下钛合金钻具表界面减阻防护机理。本项目的实施为超高真空下钛合金钻具设计和表面处理工艺选择提供技术支撑和理论指导。

The realistic and practicable drilling technology and automated drilling sampler are the key techniques for achieving the aim of the third phase of China Lunar Exploration Project. However, the basic experimental data, corresponding failure mechanisms and wear protection mechanisms for the ultrahigh vacuum tribological behaviors of the drilling tools have not been obtained and understood in China. As a result, the deep cognition of the lunar soil drilling technology and the optimal design of the lunar soil automated drilling sampler would be restricted or prevented by the above knowledge lack. This proposal aims at achieving the friction reducing and anti-wear properties of Titanium alloy drilling tools under ultrahigh vacuum conditions. Based on this idea, we proposed a method for the ultrahigh vacuum tribological evaluation in laboratory and a novel surface treatment technique for the preparation of the friction reducing and anti-wear ultra-thick and hard ceramic layers by the surface nanocrystallizition and the plasma nitriding composite process. Several series of vacuum tribotests under different parameters would be carried out, such as vacuum degrees, simulated lunar soils, the materials of counter balls, velocities and loads ect. Moreover, the microanalyses for detail microstructures and mechanical properties would be performed. Next, the intrinsic interactions among the parameters of the surface modified process - microstructures - mechanical properties - tribological behaviors - wear failures will be revealed. Finally, the surface and interface friction reducing and anti-wear protection mechanisms of Titanium alloy drilling tools under ultrahigh vacuum conditions will be deeply discussed and illuminated. The implementation of the project will provide a theoretical and practical guidance to the design of the Titanium alloy drilling tools and the selection of the relative applied surface modified techniques for the demand working under ultrahigh vacuum conditions.