铝合金-CFRP液氮温度下弯曲强度的强化研究  

Flexural strength enhancement study of aluminum-CFRP at liquid nitrogen temperature

作　　者：程飞 胡云森 CHENG Fei;HU Yunsen(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621000,China;Department of Mechanical Engineering,University of Western Australia,Perth 410082,Australia)

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]西澳大利亚大学机械工程学院,珀斯410082

出　　处：《复合材料学报》2022年第6期3009-3019,共11页Acta Materiae Compositae Sinica

基　　金：西南科技大学科研基金(20zx7141)。

摘　　要：随着铝合金-碳纤维增强树脂复合材料(CFRP)逐渐应用到火箭推进器,其低温环境下的粘结性能强化已引起广泛关注。针对环氧接头潜在的粘接界面缺陷,采用阳极氧化和砂化分别处理铝合金和CFRP板表面制得多孔表面。采用树脂预涂(RPC)技术消除铝合金孔道根部原有的大分子环氧树脂空穴缺陷,也可通过RPC技术将增强纤维碳纳米管浸渍到铝合金表面的孔道中,形成准Z方向的纤维桥联,进一步提高环氧接头的粘结强度。三点弯曲试验(3-P-B)结果表明,室温下处理后的铝合金-CFRP弯曲强度提高了14.6%,液氮温度下弯曲强度提高了27.6%。经过表面处理后,CFRP在室温和液氮温度下的破坏模式均由较弱的界面脱胶破坏转变为主体结构的断裂破坏。总之,系列有效的处理方法可为低温液体燃料箱的工业应用提供另一种参考。The adhesive bonding strength enhancement of aluminum substrate and carbon fiber reinforced polymer(CFRP)at cryogenic temperature has attracted far-ranging attention with their application expanding to rocket booster.Aiming at the potential bonding interface defect of epoxy joint,we adopted the anodizing and sanding treatments to modify surface performance of Al substrate and CFRP panel respectively.The resin pre-coating(RPC)technique was used to eliminate the originally existing defect caused by macromolecular epoxy at the root of porous Al substrate.The carbon nanotubes were applied as additives to be impregnated into channels on Al substrate surface via RPC technique and construct the quasi-Z directional fiber bridging,which can further improve the adhesive bonding strength of epoxy joint.The three-point bending(3-P-B)results show the flexural strength of aluminum substrate-CFRP after treated has been enhanced by 14.6%at room temperature,and even higher 27.6%at liquid nitrogen temperature based on that of the one only cleaned by acetone.Failure mode exhibits the weaker adhesive failure on bonding interface has been transformed into main structure fracture failure of CFRP after combined surface treatments at both room temperature and liquid nitrogen temperature.Overall,the effective treatment methods can offer an alternative reference in industrial application of cryogenic liquid fuel tank.

关 键 词：电化学刻蚀 粘接性能强化 准Z方向碳纳米管 树脂预涂技术 液氮温度 

分 类 号：TB332[一般工业技术—材料科学与工程]