针对高端齿轮性能要求，提出多元共渗FGM涂层齿轮的学术思想，利用强流脉冲电子束清洁齿轮表面、改善表层性能，采用真空热扩渗工艺制备齿轮表面多元FGM涂层，获得硬度高、层深大、性能梯度分布合理、合金化连接的涂层。重点开展以下研究：根据齿轮服役条件和受力特性提出性能梯度要求，研究组元渗层的物理特性和组元分布函数；分析多元共渗工艺、组元扩散及微组织特征，获得工艺、成分、组织间的内在联系；研究齿轮表面多元共渗FGM涂层的性能、FGM涂层组元分布、组织结构与结合力的关系；开展多元共渗FGM涂层齿轮的弯曲、接触疲劳实验研究。通过项目研究，建立FGM涂层齿轮设计方法及性能评价系统，阐明多元共渗FGM涂层组元扩散机制及渗层形成机理，解决多元共渗FGM涂层结构及性能调控问题，获得多元共渗FGM涂层齿轮的服役行为及失效机理。为新型高硬度、高耐磨性和高韧性的齿轮制造技术提供科学的理论依据、实验数据和设计方法。

The academic thought was put forward that FGM coating gear is made with multicomponent infiltration process according to performance requirement of the high-end gear. High current pulsed electron beam technology is used to clean gear surface and improve performancement, while gear surface is activated. A variety of elements are diffused into gear surface with vacuum thermal diffusion process. Then FGM coating is prepared on gear, which has the characteristics of high hardness, large depth, reasonable gradient distribution with performance and alloying connection. Studies focus as follows. The performance gradient requirements are put forward according to the gear service conditions and the stress characteristics. The physical characteristics and distribution function of component are studied. Multicomponent infiltration process, element diffusion and micro structure characteristics are analysed, then inner link is discussed between the process, composition, inter organization. Gear performance is studied with multicomponent permeation FGM coating, and relationship is gained between element distribution, organizational structure and binding force of FGM coating. The bending and contact fatigue strength are tested. The gear design method and evaluation principle of FGM coating are explained through the research projects. The multicomponent infiltration and layer formation mechanisms are illuminated. The problem of multicomponent infiltration structure and properties of FGM coating regulation are solved. Multicomponent infiltration coating FGM gear service behavior and failure mechanisms are acquired. The scientific theoretical basis, experimental data and design method are provided for new gear manufacturing process with high hardness, high wear resistance and high toughness.