C/SiC复合材料激光超声复合加工螺纹缺陷控制及拉伸性能分析  

Thread Defects Control and Tensile Property Analysis of C/SiC Composites by L-UHM

作　　者：徐浩然 王佳琦[1,2] 于占江 许金凯[1,2] XU Haoran;WANG Jiaqi;YU Zhanjiang;XU Jinkai(Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing,Changchun University of Science and Technology,Changchun,130022;School of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun,130022)

机构地区：[1]长春理工大学跨尺度微纳制造教育部重点实验室,长春130022 [2]长春理工大学机电工程学院,长春130022

出　　处：《中国机械工程》2025年第4期724-731,742,共9页China Mechanical Engineering

基　　金：国家重点研发计划(2023YFB4605900);中国航空工业-慧眼行动项目(62502010307)。

摘　　要：C/SiC复合材料常用于制作高温复合材料紧固件,但在常规加工(CM)下,螺纹特征完整度低且表面存在纤维拔出、基体破碎等损伤微观缺陷,使其难以满足高性能连接的要求。采用激光超声复合切削技术(L-UHM)开展了C/SiC复合材料螺纹特征加工,研究了不同加工方式下螺纹特征表面微观缺陷的变化规律,揭示了CM、激光辅助加工(LAM)以及L-UHM下的螺纹特征缺陷以及表面微观缺陷与其拉伸性能的关系,证明了L-UHM在C/SiC复合材料螺纹特征加工中对微观缺陷控制的优势。研究结果表明,相比于CM和LAM,在L-UHM下,牙顶、牙壁和牙底的纤维拔出、纤维脱黏和基体破碎得到控制,螺纹特征表面微观缺陷减少,完整度提高。此外,在拉伸试验中,L-UHM紧固体获得了最高的抗拉强度,较CM紧固体提高了29%,较LAM紧固体提高了10%。C/SiC composites were often used to make high-temperature composite fasteners.However,in conventional machining(CM),the integrity of thread features was low,and there were micro-defects such as fiber pull-out and matrix broken on the surfaces,which made it difficult to meet the requirements of a high-performance connection.L-UHM was used to carry out C/SiC composites thread feature machining herein.The variation of micro-defects on the surfaces of thread features and tensile test results in different machining methods were studied.The defects of thread features in CM,LAM(laser-assisted machining)and L-UHM and the relationship between surface micro-defects and tensile properties were revealed.The advantages of L-UHM in C/SiC composites thread feature micro-defects controlling were proved.The results show that compared with CM and LAM,the fiber pull-out,fiber debonding and matrix broken of the teeth tops,teeth sidewalls and teeth bottoms are inhibited,the micro defects on the surfaces of thread features are reduced,and thread feature integrity is improved in L-UHM.In addition,in the tensile tests,L-UHM achieves the highest tensile strength,which is increased by 29%compare to CM and by 10%compare to LAM.

关 键 词：C/SIC复合材料 激光超声复合加工 螺纹特征 表面缺陷 

分 类 号：TG62[金属学及工艺—金属切削加工及机床]