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MT300/802双马树脂基复合材料固化工艺及高温力学性能
李健芳1,郭鸿俊1,高杨2,张东霞1,李桂洋1
1.航天材料及工艺研究所,北京 100076;2.火箭军驻519厂军事代表室,北京 100076
摘要:
采用热分析方法研究高活性802双马树脂的固化反应动力学特征,分析树脂固化度与固化温度、固化时间的关系,确定树脂固化制度150℃/1 h+180℃/2 h+200℃/4 h,制得MT300/802复合材料200℃固化T g达到325℃,而相同固化温度XU292双马树脂T g仅为234℃。进一步考察MT300/802复合材料室温、230、280及300℃的力学性能,结果表明,复合材料单向板280℃弯曲强度保持率达到了57%,300℃弯曲强度仍达到1 094 MPa,室温及高温层间剪切强度及面内剪切强度也表现出较高的性能水平,高活性802双马树脂及其复合材料固化温度相对较低而使用温度较高,能够满足航天领域耐高温主承力结构的应用要求。
关键词:  双马树脂  复合材料  固化动力学  高温力学性能
DOI:10.12044/j.issn.1007-2330.2019.04.007
分类号:TB332
基金项目:国家自然科学基金资助 51603058 国家自然科学基金资助(51603058)
Curing Process and High Temperature Mechanical Properties of MT300/802Bismaleimide Matrix Composites
LI Jianfang1,GUO Hongjun1,GAO Yang2,ZHANG Dongxia1,LI Guiyang1
1.Aerospace Research Institute of Materials & Processing Technology, Beijing 100076;2.Military Representative Office of PLA Rocket Force in 519 Factory, Beijing 100076
Abstract:
Bismaleimide resin composites service as primary high temperature resistance load-carrying structure in aerospace crafts. Dynamic cure kinetics of highly reactived 802 bismaleimide resin was analyzed by differential scanning calorimetry, meanwhile its cure cycle was established as “150℃/1 h+180℃/2 h+200℃/4 h”. The T g of 802 resin is up to 325℃ cured at 200℃, significantly superior to XU292 resin (234℃) with the same curing temperature. Furthermore, MT300/802 composite mechanical properties were investigated at room temperature, 230, 280 and 300℃, respectively. Its flexural strength retention capacity is 57% at 280℃, and the 300℃ flexural strength is as high as 1 094 MPa. Meanwhile, its interlaminar and in-plane shear strength also exhibits high properties level at both room temperature and high temperature. The results indicate that MT300/802 composite has the feature of “low temperature curing and high temperature usage”, which is suitable for aerospace primary structures.
Key words:  Bismaleimide resin  Composites  Cure kinetics  High-temperature mechanical properties