新型C/C-TaC复合材料的微观结构及其力学性能

Microstructures and mechanical properties of novel C/C-TaC composite

采用化学气相渗透(CVI)法和热固性树脂浸渍-炭化法复合工艺制备含5%TaC的新型C/C-TaC复合材料,并对复合材料的微观结构和力学性能进行了研究。结果表明:C/C-TaC复合材料中TaC以涂层形式均匀致密地包覆在炭纤维周围,形成管状微观结构,大大提高C/C-TaC复合材料试样的平均强度和韧性。复合材料试样平均抗弯强度达到270 MPa,比C/C复合材料的提高近70%;最大断裂位移达到1.2 mm,比C/C复合材料的提高近140%,表现为良好的假塑性断裂。

The fabrication of new carbon fiber reinforced carbon-tantalum carbide composites with 5% TaC by chemical vapor infiltration（CVI） and impregnation/carbonization of thermosetting phenolic resin was presented. The microstructures and mechanical properties of C/C-TaC composites were investigated. The results show that TaC with form of coating enwrap evenly and compactly around with the carbon fiber in C/C-TaC composites and form the cannular microstructure, both the average strength and toughness of C/C-TaC composites sample increase apparently. The average flexural strength of C/C-TaC composites sample reaches up to 270 MPa, approximately increases by 70% comparing with C/C composites. The maximum fracture displacement reaches 1.2 mm, approximately increases by 140% comparing with C/C composites, which exhibits shearing failure fracture behaviors.