摘要
受熔渗动力学控制,常规反应熔渗制备的超高温陶瓷基复合材料易存在纤维/界面损伤,基体大尺寸金属残留等问题,严重影响复合材料性能。近年来,中国科学院上海硅酸盐研究所建立了基于溶胶凝胶预成型体孔隙结构设计的超高温陶瓷基复合材料反应熔渗新方法,揭示了预成型体孔隙结构对复合材料基体分布、界面损伤及性能的影响规律;发现反应熔渗超高温陶瓷基复合材料界面锆元素聚集现象,并首次提出反应类熔融界面损伤机制;提出准连续ZrC界面保护结构设计思路,有效缓解了反应熔渗纤维/界面损伤,实现反应熔渗Cf/(ZrB2)-ZrC-SiC超高温陶瓷基复合材料性能大幅提升。
Due to the influence of infiltration kinetics,composites fabricated by conventional reactive melt infiltration(RMI)method may have the disadvantages of bulky metal residuals and fiber/interphase degradation,leading to poor properties of the composites.In recent years,a novel RMI approach was developed by Shanghai Institute of Ceramics,Chinese Academy of Sciences(SICCAS)to fabricate high performance ultra-high temperature ceramic matrix composites(Cf/UHTCs)based on sol-gel structure design of porous preforms.The internal relationships of the preform pore structures on the matrix distribution,interphase erosion and composite properties were revealed.It is indicated that Zr element tended to aggregate at eroded interphase of the RMI-Cf/UHTCs composites.For the first time,a hybrid interphase erosion mechanism of chemical reaction and physical melting was proposed.A potential solution to mitigate fibers/interphase degradation was developed by a quasi-continuous ZrC interphase protection design,leading to substantially improved properties of the RMI-Cf/(ZrB2)-ZrC-SiC composites.
作者
倪德伟
陈小武
王敬晓
陈博文
姜佑霖
董绍明
NI De-Wei;CHEN Xiao-Wu;WANG Jing-Xiao;CHEN Bo-Wen;JIANG You-Lin;DONG Shao-Ming(State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Structural Ceramics and Composites Engineering Research Center,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《现代技术陶瓷》
CAS
2019年第5期293-312,共20页
Advanced Ceramics
