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]。C/SiC复合材料常用于高温复合材料紧固件，螺纹特征尺度小、加工难度大，在加工过程中面临着许多挑战。因螺纹特征复杂，故在常规加工（conventionalmachi-ning，CM）后会产生较多微观缺陷（纤维拔出、纤维脱黏、基体破碎等），导致螺纹无法正常配合或安装，影响零部件的性能[6。诸多学者对C/SiC复合材料螺纹特征加工进行了研究。柳思成等[7]认为磨削和硬质合金攻丝分别是C/SiC紧固件外螺纹和内螺纹的优选加工方式。SUN等[8]研究了渗硅对合金显微组织和力学性能的影响，发现在拉应力作用下C/C-SiC螺栓为螺柱拉伸破坏，C/C螺栓为螺纹拉脱破坏。常规加工方法加工出的螺纹特征表面微观缺陷较多，亟需引入一种新的加工技术以满足低损伤、低缺陷的要求，因此，探索合适的加工方法对实现高质量、高一致性的C/SiC螺纹连接件具有重要意义。

激光辅助加工（laser-assistedmachining，LAM和超声振动辅助加工作为C/SiC复合材料加工的有效手段，能显著提高材料的可加工性和表面质量。PARK等9使用LAM进行正交切削试验，比较了切削力。ZHOU等[10]提出了一种高效、低损伤、低磨粒磨损的激光诱导烧蚀辅助磨削方法并评价了磨削性能。ZHANG 等[11]提出了考虑韧脆转变的磨削力解析模型和切削区域内有效磨粒数量的最终模型。……