纤维增韧钢基粉末冶金齿轮抗冲击性能研究

粉末冶金齿轮应用日益广泛，但是由于其抗冲击性能偏弱，在汽车齿轮领域未能得到应有的应用。纤维增韧是在优化齿轮组织结构的基础上进一步显著提高抗冲击性能的方法，是解决粉末冶金齿轮不足的关键。本项目以钢基金属陶瓷粉末冶金齿轮为研究对象，以提高其冲击韧性这一关键质量特性为目标，以采用纤维增韧的方法为关键切入点，以优化粉末冶金制备过程工艺参数和钢基金属陶瓷组成为具体路线，研究组成、工艺参数和纤维加入对钢基粉末冶金齿轮抗冲击性能的影响及其增韧机理，以及满足齿轮传动循环冲击载荷作用特点的抗冲击性能表征方法，从而系统性地提出纤维增强型钢基粉末冶金齿轮的制备工艺。本项目旨在采用纤维增韧的方法制备满足汽车齿轮传动要求的增强型粉末冶金齿轮，为其在汽车齿轮领域得到应有的应用提供理论和技术支撑。

Powder metallurgy gear has been wildly used in modern mechanical industry. However, it hasn’t been highly concerned in automotive gear due to it’s weak anti-impact capability. Fiber toughening mechanism is an outstanding method to promote the anti-impact capability of machine elements besides optimizing it micro structure. It becomes the most appropriate and economic way to solve the problem of powder metallurgy gear. In this project, steel-based powder metallurgy gear is regard as the research object, promoting anti-impact capability is regard as the research goal, fiber toughening is regard as the key point, optimizing process parameters and components are regard as the route. Thus, systematic study on the influences of component, process parameters and fiber toughening on anti-impact capability can be studied. The principle of toughening by fibers can be analyzed. A new testing mechanism considered small energy with repetitive impact load will also be proposed to make better representation of anti-impact capability of gears. This research result can present well-developed manufacture process for enhanced powder metallurgy gear which suits for automotive gear, and offering theoretical and technical foundation for fully application of powder metallurgy gear in automotive industry.