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http://dx.doi.org/10.7234/composres.2022.35.2.093

Analysis of Thermal Degradation Mechanism by Infrared High-speed Heating of CF-PEKK Composites in Hot Press Forming  

Lee, Kyo-Moon (Major of Materials Engineering, Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University)
Park, Soo-Jeong (Department of Ocean Advanced Materials Convergence Engineering, Korea Maritime and Ocean University)
Park, Ye-Rim (Department of Ocean Advanced Materials Convergence Engineering, Korea Maritime and Ocean University)
Park, Seong-Jae (Major of Materials Engineering, Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University)
Kim, Yun-Hae (Major of Materials Engineering, Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University)
Publication Information
Composites Research / v.35, no.2, 2022 , pp. 93-97 More about this Journal
Abstract
The application of infrared heating in the hot press forming of the thermoplastic composites is conducive to productivity with high-speed heating. However, high energy, high forming temperature, and high-speed heating derived from infrared heating can cause material degradation and deteriorate properties such as re-melting performance. Therefore, this study was conducted to optimize the process conditions of the hot press forming suitable for carbon fiber reinforced polyetherketoneketone(CF/PEKK) composites that are actively researched and developed as high-performance aviation materials. Specifically, the degradation mechanisms and properties that may occur in infrared high-speed heating were evaluated through morphological and thermal characteristics analysis and mechanical performance tests. The degradation mechanism was analyzed through morphological investigation of the crystal structure of PEKK. As a result, the size of the spherulite decreased as the degradation progressed, and finally, the spherulite disappeared. In thermal characteristics, the melting temperature, crystallization temperature and heat of crystallization tend to decrease as degradation progresses, and the crystal structure disappeared under long-term exposure at 460℃. In addition, the low bonding strength was observed on the degraded surface, and the bonding surfaces of PEKK did not melt intermittently. In conclusion, it was confirmed that the CF/PEKK composite material degraded at 420℃ in the infrared high-speed heating. Furthermore, the spherulite experienced morphological changes and the re-melting properties of thermoplastic materials were degraded.
Keywords
Carbon Fiber-PEKK; Infrared Heating; Thermal Degradation; Hot Press Forming;
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