航空发动机陶瓷基复合材料高频超声振动辅助磨削基础研究

碳化硅纤维增强碳化硅陶瓷基复合材料是国内外各类先进航空发动机发展计划所重点发展的新型高温热结构材料。但是，常规加工技术难以满足该类材料高效低损伤加工需求，已成为下一代航空发动机研制的瓶颈之一。本项目以深入探索高频超声振动辅助磨削条件下碳化硅纤维增强碳化硅陶瓷基复合材料去除和加工表面损伤机理的基础科学问题为线索，探明高频超声振动辅助磨削碳化硅纤维增强碳化硅陶瓷基复合材料加工损伤抑制机制，揭示高频超声振动辅助磨削加工负载与谐振频率和振幅的关联关系，建立高频超声振动系统频率与振幅的工作稳定性控制方法，提出基于高出露磨粒排布、振动条件与磨削工艺间多元协同的碳化硅纤维增强碳化硅陶瓷基复合材料加工损伤主动控制策略，解决材料去除率低，加工效率不高、加工损伤难控制、工具磨损严重等关键问题，提升我国航空发动机高温热端陶瓷基复合材料构件高效精密制造技术水平。

SiC fiber-reinforced SiC ceramic matrix composite is a new type of high temperature thermal structural material, which is the focus of all kinds of advanced aeroengine development plans at home and abroad. However, conventional processing technology is difficult to meet the needs of high-efficiency and low damage processing of this kind of material, which has become one of the bottlenecks in the development of next generation aeroengine. In this project, the basic scientific problems of the mechanism of removing and machining surface damage of SiC fiber-reinforced SiC ceramic matrix composite under the condition of high frequency ultrasonic vibration assisted grinding will be explored as clues. The mechanism of machining damage suppression of SiC fiber-reinforced SiC ceramic matrix composite under the condition of high frequency ultrasonic vibration assisted grinding will be ascertained. The relationship between the load of high frequency ultrasonic vibration assisted grinding and the resonance frequency and amplitude will be revealed. The control method of frequency and amplitude stability of high frequency ultrasonic vibration system will be established. The active control strategy of machining damage of SiC fiber-reinforced SiC ceramic matrix composites based on the arrangement of high exposed abrasive particles, the coordination of strengthening vibration and grinding process matching will be realized. Through the above research, the outstanding problems such as low material removal rate, low machining efficiency, difficult to control machining damage and serious tool wear will be solved. It will promote the high efficiency and precision manufacturing technology of ceramic matrix composite parts of aeroengine in China.