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

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关键词：C/SiC复合材料;激光超声复合加工;螺纹特征;表面缺陷中图分类号：TG62DOI：10.3969/j.issn.1004-132X.2025.04.009 开放科学（资源服务）标识码（OSID）：

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

XU Haoran1，² WANG Jiaqi1，² YU Zhanjiang1² XU Jinkai1，2*

1.Ministry of Education Key Laboratory for CrossScale Micro and Nano Manufacturing，Changchun University of Science and Technology，Changchun，130022

2.School of Mechanical and Electrical Engineering，Changchun University of Science and Technology， Changchun，130022

Abstract： 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 met 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 microdefects controlling were proved. The results show that compared with CM and LAM，the fiber pullout，fiber debonding and matrix broken of the teth 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.

Key words： C/SiC composite; laser-ultrasonic hybrid machining（L-UHM）； thread feature； sur-face defect

0 引言

C/SiC复合材料因其优异的力学性能、耐高温性及低密度等优点，逐渐成为航空航天、汽车以及能源等领域的重要材料[1-5]。（剩余14055字）