崔旭,赵普,熊需海,张忠宝,王道晟.表面处理对TC4钛合金-GF/PEI复合材料电阻焊接强度的影响[J].表面技术,2019,48(11):244-251.
CUI Xu,ZHAO Pu,XIONG Xu-hai,ZHANG Zhong-bao,WANG Dao-sheng.Influence of Surface Pre-treatment on Resistance Welding Strength of Titanium Alloy-GF/PEI Composites[J].Surface Technology,2019,48(11):244-251 |
| 表面处理对TC4钛合金-GF/PEI复合材料电阻焊接强度的影响 |
| Influence of Surface Pre-treatment on Resistance Welding Strength of Titanium Alloy-GF/PEI Composites |
| 投稿时间：2019-04-01 修订日期：2019-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.11.026 |
| 中文关键词: 钛合金 聚醚酰亚胺 电阻焊接 机械打磨 刻蚀 失效模式 |
| 英文关键词:titanium alloy polyetherimide resistance welding mechanical polishing etching failure mode |
| 基金项目:辽宁省高等学校国（境）外培养项目（2018LNGXGJWPY-YB008） |
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| Author | Institution |
| CUI Xu | Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136, China |
| ZHAO Pu | Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136, China |
| XIONG Xu-hai | Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136, China |
| ZHANG Zhong-bao | Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136, China |
| WANG Dao-sheng | Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136, China |
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| 中文摘要: |
| 目的 提高钛合金-复合材料电阻焊接界面强度。方法 以不锈钢网、预浸料和树脂薄膜的组合结构作为界面植入体，利用脉冲电阻焊接技术连接钛合金和玻璃纤维增强聚醚酰亚胺（GF/PEI）层合板。对表面光滑的钛合金分别进行砂纸机械打磨以及H2O2/NaOH碱性混合溶液刻蚀处理，并通过能谱分析仪、扫描电子显微镜和静态接触角测试仪，分别对钛合金表面成分、形貌和粗糙程度进行分析。对表面处理后的钛合金和GF/PEI层合板进行电阻焊接，并对焊件进行单搭接拉伸剪切试验，以评估焊接头的强度。利用超声波扫描显微镜检测层合板内部损伤验证接头失效模式。结果 通过机械打磨后的钛合金，表面粗糙程度增加，接触角从56.8°上升到84.8°。钛合金与PEI树脂的界面结合性能上升，使最大焊接强度提升187.0%。碱性混合溶液刻蚀后的钛合金，表面形貌随刻蚀时间（te）的增长呈现出不同的结构，并在刻蚀后期出现亚微米级的网络结构，同时伴随着表面接触角从56.8°上升到136.3°。钛合金表面的亚微米级网络结构与PEI树脂形成机械互锁结构来共同承担焊接头的力学性能，使最大焊接强度提升198.4%。接头失效分析显示，焊接初期接头的主要失效模式为钛合金板从界面处直接剥离；焊件强度达到最佳时，失效模式转变为植入体断裂。结论 对钛合金进行机械打磨和刻蚀处理可以有效改善表面粗糙程度，从而提高钛合金-GF/PEI层合板的焊接头强度。 |
| 英文摘要: |
| The work aims to improve the resistance welding interface strength of titanium alloy-composite. A combination of stainless-steel mesh, prepreg and resin film was used as the interface implant, and the titanium alloy and the glass fiber reinforced polyetherimide (GF/PEI) laminate were connected by pulse resistance welding technology. The smooth surface of the titanium alloy was ground mechanically by abrasive sand and etched by H2O2/NaOH alkaline mixed solution. The chemical components, surface morphology and roughness of the titanium alloy were analyzed by energy dispersive spectrometer (EDS), scanning electron microscope (SEM) and static contact angle tester. Resistance welding was carried out to the titanium alloy with surface treated and the GF/PEI laminate, and the weldment was subjected to a single lap tensile shear test to evaluate the strength of the welded joint. The failure mode of the joint was verified by ultrasonic scanning microscopy to detect the internal damage of the laminate. After the titanium alloy was ground mechanically, the surface roughness increased and the contact angle increased from 56.8° to 84.8°. The interfacial bonding properties of titanium alloy and PEI resin increased, and the maximum welding strength was increased by 187.0%. The surface morphology of the titanium alloy after etched by alkaline mixed solution etching showed different structures with the increase of etching time (te), and a submicron network structure appeared in the later stage of etching. At the same time, the surface contact angle increased from 56.8° to 136.3°. The submicron network structure of the titanium alloy surface formed a mechanical interlocking structure with the PEI resin to jointly bear the mechanical properties of the welded joint, and the maximum welding strength was increased by 198.4%. The joint failure analysis showed that the main failure mode of the joint at the initial stage of welding was that the titanium alloy was directly peeled off from the interface. When the strength of the weldment achieved optimal, the failure mode was changed into the fracture of the implant. Mechanical grinding and etching of the titanium alloy can effectively improve the surface roughness, thereby improving the strength of welding joint of the titanium alloy-GF/PEI laminate. |
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