激光扫描阵列结构增强不锈钢与塑料的连接强度

本文采用光纤激光器在不锈钢表面上制备圆形阵列结构来增强不锈钢与塑料的连接强度。研究了激光制备的圆形阵列结构参数以及连接参数对不锈钢与塑料连接强度的影响。结果表明，不锈钢表面经过激光扫描构形处理后能显著提高不锈钢与塑料的连接强度，在压力作用下，熔融塑料渗入激光构造微孔形成的机械互锁是增强不锈钢与塑料连接强度的主要机制。激光构形后不锈钢表面上的毛刺高度、数量以及覆盖率对连接接头的连接强度有重要影响。毛刺高度为10~20 μm,毛刺数量占比Tm小于14.82%时，不锈钢与塑料在连接面处断裂，剪切力随着Tm的增加而增加；当Tm值高于14.82%时，在塑料处断裂，且剪切力数值在塑料的平均拉伸断裂力(950 N)上下浮动。不锈钢与塑料连接接头断裂于塑料处时所对应的最小覆盖率为38.5%，此时剪切力为900 N。此外，激光扫描处理过程中不锈钢与塑料连接的温度与压力对连接强度有重要影响，在加热温度为400℃时，不锈钢与塑料连接接头的剪切力最强；当压力为75 kN时，不锈钢与塑料连接接头的剪切力最强。

Abstract

In this paper, the surface of stainless steel is treated with a fiber laser to prepare a circular array structure to enhance the bonding strength between stainless steel and plastic. The stainless steel is connected to the plastic under heat and pressure. In order to obtain the expected bonding strength of stainless steel and plastic, the effects of the circular array structure′s parameters and bonding parameters on bonding strength are investigated. The results show that when the heating temperature is 400 ℃, the shear force of stainless steel and plastic bond is the strongest. When the pressure is 75 kN, the shear force of stainless steel and plastic bond is at its strongest. The height, quantity and coverage of burrs on the metal surface after laser treatment have an important effect on the bonding strength between stainless steel and plastics. When the proportion of burr number Tm value is less than 14.82%, the stainless steel and plastic fractured at the bond′s surface and the shear force increases with the increase of Tm. When the Tm value is greater than 14.82%, the stainless steel and plastic fractured at the plastic, and the strength of the shear force fluctuates around the average tensile fracture force of 950 N. The coverage of the laser processing area has an impact on the connection strength, 38.5% is the minimum coverage of stainless steel and plastics when they fracture at the plastic, which then has shear force of 900 N.

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李彦清, 范海琦, 朱奎名, 刘双宇. 激光扫描阵列结构增强不锈钢与塑料的连接强度[J]. 中国光学, 2020, 13(2): 313. LI Yan-qing, FAN Hai-qi, ZHU Kui-ming, LIU Shuang-yu. Enhanced bonding strength between stainless steel and plastic by using laser scanning array structure[J]. Chinese Optics, 2020, 13(2): 313.

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