Enhanced bonding strength between stainless steel and plastic by using laser scanning array structure
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摘要:本文采用光纤 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 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 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 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。 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 T m小于14.82%时，不锈钢与塑料在连接面处断裂，剪切力随着 T m的增加而增加；当 T m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， 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 T mvalue 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 T m. When the T mvalue 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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Key words:
- laser processing/
- scanning configuration/
- array structure/
- shear force
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图 5不锈钢加热200℃时，塑料连接界面的表面形貌。(a)连接前；(b)连接后
Figure 5.Surface morphologies of plastic connection interface when the stainless steel is heated to 200℃.(a) Before connection; (b)after connection
图 6在微孔直径为0.2 mm、0.5 mm和0.7 mm时，加热温度对不锈钢与塑料连接强度的影响
Figure 6.Effect of heating temperature on connection strength between the stainless steel and the plastic when the diameter of the micropores is 0.2, 0.5 and 0.7 mm
图 7不同温度下，微孔直径为0.7 mm的不锈钢与塑料的连接截面照片。(a)300℃、(b)400℃、(c)500℃、(d)600℃
Figure 7.Photos of connection section of stainless steel and plastic with micropore diameter of 0.7 mm at different temperatures. (a) 300℃; (b) 400℃; (c) 500℃; (d) 600℃
图 8在微孔直径为0.2 mm、0.5 mm和0.7 mm的条件下，连接压力对不锈钢与塑料连接强度的影响
Figure 8.Effect of the connection pressure on the connection strength between the stainless steel and the plastic when the diameter of the micropore is 0.2, 0.5 and 0.7 mm
图 9微孔直径为0.5 mm时，不同连接压力下的不锈钢与塑料的连接截面照片。(a)45 kN、(b)55 kN、(c)65 kN、(d)75 kN、(e)85 kN
Figure 9.Photographs of connection section of plastic and stainless steel with micropore diameter of 0.5 mm under different connection pressures. (a) 45 kN; (b) 55 kN; (c) 65 kN; (d) 75 kN; (e) 85 kN
图 10微孔直径为0.5 mm，不同毛刺占比时的3D形貌照片。(a)Tm=4.62%；(b)Tm=14.82%；(c)Tm=19.44%
Figure 10.3D morphology photos of micropore with diameter of 0.5 mm at differentTm.(a)Tm=4.62%;(b)Tm=14.82%;(c)Tm=19.44%
图 11 标刻次数与某一范围内毛刺个数占比关系柱形图
Figure 11.Column diagram showing the relationship between laser marking number and the proportion of burrs in a certain range
图 12 标刻次数与Tm和与剪切力的关系
Figure 12.The relationship betweenTm, shear force and laser marking time
图 13(a) 连接界面处和(b)塑料处的断裂位置和形貌
Figure 13.Fracture locations and morphologies of (a)bonding interface and (b)inside plastics
图 14Tm=16.89%时，不锈钢连接后表面微孔的3D形貌
Figure 14.3D morphology of surface micropores after bonding stainless steel whenTm=16.89%
图 15微孔直径为0.5 mm的不锈刚的3D形貌照片。(a)C=54.0%、(b)C=19.3%
Figure 15.3D morphologies of stainless steel surface with micropore diameter of 0.5mm. (a)C=54.0%; (b)C=19.3%
图 16覆盖率对不锈钢与塑料连接强度的关系曲线
Figure 16.Relationship curve of coverage rate vs connection strength
表 1不锈钢和PP+EDPM-T20的物理性能和力学性能
Table 1.Physical and mechanical properties of stainless steel and PP+EDPM-T20
材料 密度/
(g·cm-3)熔点/
(℃)热降解温度/(℃) 抗拉强度/
MPa不锈钢 7.93 1 398~1 454 - ≥520 PP+EDPM-T20 1.05±0.02 160 450 ≥20 
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表 2 器的参数
Table 2.Parameters of the laser equipment
参数 数值 参数 数值 波长/nm 1 064 平均功率/W 20 脉宽/μs 100 频率/KHz 25 脉冲能量/mJ 1 光斑/mm φ0.05 功率密度/mW·cm-2 510 范围/mm 100×100 下载:
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表 3不同温度下连接接头的拉伸强度
Table 3.Tension strength of joint at different temperatures
序号 温度/(℃) 断裂位置 剪切力/N 1 200 连接失败 0 2 300 连接界面 602 3 400 连接界面 705 4 500 连接界面 673 5 600 连接界面 639 下载:
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