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Tianyun Wan,Huihuang Ma,Zijian Wang,Chuanjie Fan,Xiaodong Zhou 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Carbon fiber reinforced polyether-ether-ketone (CF/PEEK) composite materials had a wide range of applicationsin the aerospace, electronics and electrical fields, etc. The composite materials were generally prepared from prepregs. Commonly used prepreg tape preparation methods had disadvantages of uneven resin distribution and inadequate fiberimpregnation, resulting in high porosity and poor mechanical properties. In this research, a combined process of the doublepowder impregnation method and the melt homogenization method was used to prepare the CF/PEEK prepreg tape to solvethe previous problems. Using this method, the porosity of the prepreg tape was reduced by 56.30 % and the tensile strengthwas increased by 43.35 % compared with the traditional powder impregnation method. At the same time, the prepreg tapewas widened and thinned and the uniformity of resin distribution was improved. Besides, based on the single factorexperiment, the response surface method was used to construct the impregnation model of the quadratic polynomialregression equation between the process parameters (powder impregnation temperature, traction speed and melthomogenization temperature) and the porosity of the CF/PEEK prepreg tape. According to this model, the process parametersfor the porosity of the prepreg tape were calculated to reach the minimum, namely, the powder impregnation temperature was380 ℃, the traction speed was 1 m/min, and the melt homogenization temperature was 380 ℃. As a result of these processparameters, the porosity of the prepreg tape could be reduced to 7.39 %. Subsequently, the model was verified throughexperiments, which could provide a reference for the process parameters setting of the impregnation process.
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Shen Jialei,Liu Haiyan,Ma Huihuang,Chang Yao,Zhou Xiaodong 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.1
Due to the significant photothermal damage caused by lasers, there is a need to explore new materials that possess excellent insulation and laser protection properties. In this study, the in situ solution gel method was employed to fabricate a methyltrimethoxysilane (MTMS) modified composite of glass fiber (GF) reinforced Al2O3–SiO2 aerogel. The laser protection capability of aerogel composites with varying ratios of Al/Si was investigated, while the laser ablation behavior of the materials was characterized using FESEM and FT-IR. The results indicate that the composite aerogel material with an Al/Si molar ratio of 3:1 exhibits a high damage threshold temperature and can withstand continuous laser exposure (3500 W/cm2) for 59 s. These findings suggest that Al2O3–SiO2 aerogel composites hold promising potential for applications in laser protection. The pore structure of the aerogel in the region affected by scattering damage is disrupted and appears black, emitting intense visible light upon laser irradiation. In the central ablative melting area, it is evident that the glass fiber and aerogel have undergone complete ablation and melting.
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