Thermal spray metallisation of carbon fibre reinforced polymer composites: Effect of top surface modification on coating adhesion and mechanical properties
Thermal spray metallisation of carbon fibre reinforced polymer composites: Effect of top surface modification on coating adhesion and mechanical properties
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DOI：
10.1016/j.surfcoat.2017.10.066
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发表时间：
2018-01
影响因子：
5.4
通讯作者：
A. Rezzoug;S. Abdi;A. Kaci;M. Yandouzi
中科院分区：
文献类型：
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作者：
A. Rezzoug;S. Abdi;A. Kaci;M. Yandouzi
热喷涂(TS)工艺用于增强聚合物基复合材料的表面性能。然而，通常会遇到附着力差和机械降解的问题。本工作的主要目的是研究碳纤维增强聚合物(CFRP)基板上表面的改性对金属涂层TS沉积的影响。用不同的上层制造了CFRP复合板：(I)纯环氧溢流层，(Ii)纯铜粉填充层，(Iii)铜和不锈钢混合粉末填充层，(Iv)铝网状层。在成型过程中，制造了CFRP基材的顶层。电弧喷涂是TS工艺的一种，用来在制造的CFRP板上沉积锌涂层。在TS工艺之前对衬底进行喷砂处理，以提高沉积锌与衬底的附着力。分别用拉伸附着力和弯曲试验考察了涂层的附着力和力学性能。用光学显微镜和电子显微镜对金属化碳纤维片材的孔隙率、显微组织、形貌和表面断口进行了表征。结果表明，纯环氧面层在TS工艺前不抗喷砂，与填充和网状面层的基材相反。此外，铝基网状层的粘接强度提高了约50%。弯曲试验结果表明，涂层降低了CFRP复合材料的力学性能。然而，金属网层的使用降低了喷雾的降解效果。
Thermal Spray (TS) processes are used to enhance the surface properties of Polymer Matrix Composites. However, poor adhesion and mechanical degradation are usually experienced. The main objective of this work is to investigate the effect of the modification of the top surface of Carbon Fibre Reinforced Polymer (CFRP) substrate on the TS deposition of metallic coatings. CFRP composite panels were manufactured with different upper layers: (I) pure epoxy overflow layer, (II) pure copper powder filler layer, (III) mixture copper and stainless steel powder filler layer, and (IV) aluminium mesh layer. The top layers of the CFRP substrates were manufactured during the forming process. Arc Spray, one of the TS processes, was used to deposit zinc coating onto the manufactured CFRP panels. The substrates were sandblasted before the TS process to enhance the adhesion of the deposited zinc to the substrate. The quality of the coatings including adhesion and mechanical properties was investigated using tensile adhesion and bending test, respectively. The porosity, microstructure, morphology and surface fracture of the metallised CFRP coupons were characterized using optical and electronical microscopy techniques. The results obtained revealed that pure epoxy top layer did not resist to sandblasting prior to TS process, contrary to the substrates with fillers and mesh top layer. Moreover, the aluminium based mesh layer improved the adhesion strength by about 50%. Bending test results indicated that coating on CFRP composites decreased their mechanical properties. However, the use of a metallic mesh layer reduced the degradation effect of spraying.