Effect of layer thickness on bonding strength of Al/epoxy resin joints via interpenetrating phase layer
Effect of layer thickness on bonding strength of Al/epoxy resin joints via interpenetrating phase layer
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DOI：
10.1016/j.jmatprotec.2017.10.054
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发表时间：
2018-04
影响因子：
6.3
通讯作者：
Asuka Suzuki;Y. Arai;N. Takata;M. Kobashi
中科院分区：
文献类型：
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作者：
Asuka Suzuki;Y. Arai;N. Takata;M. Kobashi
在Al基材上制备开孔铝（Al）层，并将环氧树脂（环氧树脂）渗透到铝（Al）层中固化。Al与环氧树脂形成“互穿相层”，三维互锁。将IPL中环氧树脂的体积分数固定为0.8，研究了IPL厚度（tIPL）对拉伸强度（σj）的影响。σj在0 ~ 2 mm范围内增大，在5 mm和10 mm范围内减小。根据对断裂表面的观察，σj的下降是由于环氧树脂的不完全渗透造成的。当entipl0 ~ 2mm范围内，Al与环氧树脂分离，环氧树脂断裂发生在环氧树脂/IPL界面边缘，这是断裂的起点。当tipl <0.5 mm时，环氧树脂在环氧树脂/IPL界面处的面积分数小于0.8，导致应力集中显著。tipl需要高于Al衬底的孔径。通过控制tipl，获得了拉伸强度为38.0 MPa的Al/IPL/环氧树脂接头。
Open porous Aluminum (Al) layer was fabricated on Al substrate, and epoxy resin (epoxy) was infiltrated into the layer and cured. Al and epoxy formed “interpenetrating phase layer (IPL)”, and interlocked three-dimensionally each other. The volume fraction of epoxy in the IPL was fixed at 0.8, and the effect of the thickness of the IPL (tIPL) on the tensile strength (σj) was investigated. σjincreased whentIPLwas in the range of 0–2 mm, and decreased whentIPLwas 5 mm and 10 mm. Based on observations of fractured surfaces, this decrease in σjwas due to incomplete infiltration of epoxy. WhentIPLwas in the range of 0–2 mm, separation of Al and epoxy and rupture of epoxy occurred at the epoxy/IPL interface edge, which was the starting point for the fracture. FortIPL<0.5 mm, the area fraction of epoxy at the epoxy/IPL interface was lower than 0.8, resulting in significant stress concentration.tIPLneeds to be higher than the pore diameter in the Al substrate. By controllingtIPL, Al/IPL/epoxy joints were obtained with a tensile strength of 38.0 MPa.