Mechanical properties of domestic CCF800H carbon fiber reinforced high temperature resistant BMI matrix composites

doi:10.19936/j.cnki.2096-8000.20221128.017

Abstract

Abstract: CCF800H/QY260E high temperature resistant composites were prepared by hot melt mixing prepreg using autoclave processing. The viscosity-temperature property of QY260E was studied, and then the interfacial properties, toughness and hydrothermal-resistant properties of domestic CCF800H/QY260E composite were synthetically investigated by the scanning electronic microscopy (SEM), glass transition temperature (T_g) determination before and after moisture absorption, basic mechanical properties tests and fracture morphology analysis. The results show that QY260E bismaleimide composite possesses longer temperature and time range at low viscosity. The saturation hygroscopicity rate of CCF800H/QY260E is only 0.66%, and its T_g descends only 21 ℃ after 14 days at 71 ℃ immertion. In addition, the retention ratio of 0° tensile strength is above 80% and the open hole tensile strength is above 90% at 230 ℃/humidity. The retention ratio of 0° tensile strength is above 70% and the open hole tensile strength is above 90% at 260 ℃/humidity. The retention ratio of interfacial shear strength and open hole compression strength are above 40% at 230 ℃/humidity and 260 ℃/humidity. The CAI value of CCF800H/QY260E is close to foreign advanced composite IM7/5250-4. Tight connection between fiber and resin is observed from fracture morphology of 90°tensile samples and interlaminar shear samples. Therefore, all the results indicate that the CCF800H/QY260E composite has good mechanical properties and hydrothermal-resistant properties.

Key words: carbon fiber, high temperature resistant BMI resin, composite, glass transition temperature, mechanical properties

CLC Number:

TB332

WANG Ying-fen, PAN Cui-hong, ZHOU Hong-fei, SUN Zhan-hong. Mechanical properties of domestic CCF800H carbon fiber reinforced high temperature resistant BMI matrix composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(11): 114-119.

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