碳纤维增强热固性复合材料-钛合金激光连接接头性能分析

邹祺; 叶逸云; 焦俊科; 吴志生; 徐子法; 张文武

doi:10.7527/S1000-6893.2022.25037

航空学报 >

2022 , Vol. 43 >Issue 2: 625037 - 625037

DOI: https://doi.org/10.7527/S1000-6893.2022.25037

先进航空材料焊接/连接专栏

碳纤维增强热固性复合材料-钛合金激光连接接头性能分析

邹祺 ,
叶逸云 ,
焦俊科 ,
吴志生 ,
徐子法 ,
张文武

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1. 太原科技大学材料科学与工程学院, 太原 030024;
2. 中国科学院宁波材料技术与工程研究所, 宁波 315201;
3. 扬州大学机械工程学院, 扬州 225127;
4. 浙江省航空发动机极端制造技术研究重点实验室, 宁波 315201

收稿日期: 2020-12-01

修回日期: 2021-01-05

网络出版日期: 2022-03-04

基金资助

中国科学院重点部署项目（ZDRW-CN-2019-01）；浙江省重点研发计划（2020C01036）；宁波市"科技创新2025"重大专项（2019B10074）；浙江省博士后择优资助项目（ZJ2019166）

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Performance analysis of carbon fiber reinforced thermalsetting composite-titanium alloy laser joint

ZOU Qi ,
YE Yiyun ,
JIAO Junke ,
WU Zhisheng ,
XU Zifa ,
ZHANG Wenwu

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1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;
2. Ningbo Institute of Materials Technology & Engineering, Ningbo 315201, China;
3. School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;
4. Zhejiang Key Laboratory of Aero Engine Extreme Manufacturing Technology, Ningbo 315201, China

Received date: 2020-12-01

Revised date: 2021-01-05

Online published: 2022-03-04

Supported by

Key Deployment Projects of the Chinese Academy of Sciences (ZDRW-CN-2019-01);The Zhejiang Provincial Key Research and Development (2020C1036); The "Science and Technology Innovation 2025" Major Project of Ningbo City (2019B10074); The Zhejiang Postdoctoral Scientific Research Project (ZJ2019166)

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摘要

碳纤维增强热固性复合材料（CFRTS）和TC4钛合金具有较高的比强度和比刚性，轻量化效果十分明显，在航空航天、新能源汽车制造中应用广泛。为实现CFRTS与TC4钛合金的高强度连接，引入"激光清洗+树脂填充"的界面复合调控工艺。在CFRTS和TC4钛合金激光焊接之前，首先，采用脉冲光纤激光器对CFRTS表面进行激光清洗处理，去除表层的环氧树脂，使CFRTS中的碳纤维裸露出来；其次，利用脉冲光纤激光器对钛合金表面进行微织构处理，提升焊接时熔融树脂与TC4钛合金的接触面积并形成"咬合"结构；最后，在清洗后的CFRTS和钛合金接触面之间添加合适厚度的聚酰胺（PA）树脂，进行激光辅助焊接。研究了激光清洗工艺对接头连接强度的影响，对比分析了不同激光清洗工艺参数下CFRTS的表面形貌、PA树脂填充情况、接头断口形貌，结果表明，激光清洗CFRTS可以显著增强CFRTS-TC4钛合金接头的强度，最大拉伸强度可达23.77 MPa。

关键词： 激光清洗; 激光焊接; 碳纤维增强热固性复合材料-钛合金异质结构; 连接强度; 失效机制

本文引用格式

邹祺 , 叶逸云 , 焦俊科 , 吴志生 , 徐子法 , 张文武 . 碳纤维增强热固性复合材料-钛合金激光连接接头性能分析[J]. 航空学报, 2022 , 43(2) : 625037 -625037 . DOI: 10.7527/S1000-6893.2022.25037

Abstract

Carbon Fiber Reinforced Thermalsetting (CFRTS) composites and TC4 titanium alloy have high specific strength and rigidity and have obvious lightweight effect, and are widely used in aerospace and new energy automobile manufacturing. To realize high-strength connection between CFRTS and TC4 titanium alloy, this paper introduces an interface compound control process of "laser cleaning+resin filling". To expose the carbon fiber in the CFRTS, a pulsed fiber laser was firstly used to clean the surface of CFRTS, so as to remove the epoxy resin on the surface before laser welding of CFRTS and TC4 titanium alloy. Secondly, a pulsed fiber laser was used to process the surface microtexture of the titanium alloy, so as to increase the contact area between the molten resin and the TC4 titanium alloy during welding and form an "occlusal" structure. Finally, PolyAmide (PA) resin of appropriate thickness was added into the contact surface of the cleaned CFRTS and the titanium alloy for laser-assisted welding. The influence of laser cleaning process on the joint connection strength is studied. A comparative analysis of the CFRTS surface morphology, PA resin filling quality, and joint fracture morphology for different laser cleaning process parameters shows that laser cleaning of CFRTS can significantly enhance the strength of CFRTS-TC4 titanium alloy joint, with the maximum tensile strength reaching 23.77 MPa.

Key words： laser cleaning; laser welding; carbon fiber reinforced thermalsetting composites-titanium alloy heterostructure; connection strength; failure mechanism

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