| BA De-ma,QIAO Qian-sen,LI Chang-qing,CUI Hai-chao.Surface Treatment Performance of Open Low-temperature Plasma on Resin Matrix Composites[J],52(6):420-428 |
| Surface Treatment Performance of Open Low-temperature Plasma on Resin Matrix Composites |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.06.039 |
| KeyWord:resin matrix composites open low-temperature plasma micromorphology surface energy bonding properties |
| Author | Institution |
| BA De-ma |
Department of Equipment Support and Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| QIAO Qian-sen |
Department of Equipment Support and Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| LI Chang-qing |
No.32178, People's Liberation Army of China, Beijing , China |
| CUI Hai-chao |
AVIC Composite Technology Center, Beijing , China |
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| Abstract: |
| The work aims to treat the surface of resin matrix composites by open low-temperature plasma to investigate its effect on the bonding properties of resin matrix composites. Firstly, the open low-temperature plasma processing technology and the surface free energy interactivity of resin matrix composites were investigated by the response surface method. The surface energy was calculated by the Owens two-liquid method, and the test liquids were water and diiodomethane. Contact angle, surface energy, surface micromorphology, surface roughness, and surface chemical composition of resin matrix composites before and after open low-temperature plasma processing were analyzed by contact angle measuring instrument, scanning electron microscope (SEM), three-dimensional morphology instrument, X-ray photoelectron spectrometer (XPS), and Fourier infrared spectrometer (FT-IR), and the bonding strength of resin matrix composites before and after processing was investigated by a universal testing machine. The bonding strength of the resin matrix composites before and after the treatment was investigated by a universal testing machine. The results indicated that the three response factors of plasma surface treatment machine input power (P), gun distance (d) and specimen movement speed (v) had an effect on the surface energy of composites, in which the gun distance had the most significant effect on the surface energy of composites, followed by the specimen movement speed and input power. Design-Expert was adopted for open low-temperature plasma treatment of composite processing. When the open low-temperature plasma processing parameters were:P=800 W, d=11.8 mm and v=10 mm/s, the surface energy was the largest, and the surface energy of the untreated composite was 24.8 mJ/m2, and the surface energy of the composite increased to 78.3 mJ/m2 after the optimized process, increasing by 2.16 times. The water contact angle was reduced from 89.5° to 10.7° and the diiodomethane contact angle was reduced from 56.7° to 15.8°, and the surface wettability of the specimens was greatly increased. After low-temperature plasma treatment, the surface microscopic morphology of resin matrix composites changed significantly. The surface roughness of the specimen increased after the low-temperature plasma treatment, and the roughness increased by about 2.5 times compared with that of the untreated specimen. In addition, the oxygen content on the surface of the treated specimens increased significantly, and the oxygen-carbon ratio increased by about 1.93 times. The oxygen element mainly existed in the form of oxygen-containing polar functional groups, and the polarity of the material surface increased, and the increase of oxygen-containing polar functional groups is conducive to the formation of chemical bonding during bonding and the improvement of bonding strength. After open low-temperature plasma treatment of resin matrix composites, the bonding strength was significantly increased, and the average tensile shear strength of bonded specimens increased from 16.6 MPa to 27.5 MPa, and the bonding strength increased by about 65.7%, and the damage form of bonded joints changed from interface damage to material substrate damage. The open low-temperature plasma treatment of the resin matrix composite surface can effectively increase its bonding strength, and the resin matrix composite wettability and surface energy, surface roughness and the increase in the number of oxygen-containing functional groups on the surface are the main factors for the increase of the bonding strength. |
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