C/SiC復(fù)合材料激光超聲復(fù)合加工螺紋缺陷控制及拉伸性能分析

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關(guān)鍵詞：C/SiC復(fù)合材料;激光超聲復(fù)合加工;螺紋特征;表面缺陷中圖分類號(hào)：TG62DOI：10.3969/j.issn.1004-132X.2025.04.009 開放科學(xué)（資源服務(wù)）標(biāo)識(shí)碼（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復(fù)合材料因其優(yōu)異的力學(xué)性能、耐高溫性及低密度等優(yōu)點(diǎn)，逐漸成為航空航天、汽車以及能源等領(lǐng)域的重要材料[1-5]。（剩余14055字）