无机材料学报2024，Vol.39Issue(3)：259-266,中插1,9.DOI:10.15541/jim20230352
国产三代2.5D SiCf/SiC复合材料的界面力学性能
Interfacial Mechanical Properties of the Domestic 3rd Generation 2.5D SiCf/SiC Composite
摘要
Abstract
Continuous silicon carbide fiber reinforced silicon carbide composite(SiCf/SiC)is a critical structural material for the development of next-generation aircraft engines.The interfacial property is one of the important factors determining the material mechanical properties.Therefore,this study characterized the interfacial mechanical properties of domestic third-generation 2.5D SiCf/SiC and investigated its relationship with tensile properties.The residual stress of the 2.5D SiCf/SiC constituents and interfacial sliding stress(IFSS)were quantitatively analyzed by hysteresis characteristics during the cyclic tension loading/unloading test.Statistical distributions of the in-situ fiber strength(σ fu)were obtained based on the fracture mirror radius of pull-out fibers.Interfacial shear strength(ISS)and interfacial debonding energy(Gi)were obtained through the push-in method.Results show that combination of macroscopic and microscopic methods can comprehensively describe the interfacial mechanical performance of 2.5D SiCf/SiC from crack initiation to final debonding.The IFSS,ISS,and Gi of 2.5D SiCf/SiC are 56 MPa,(28±5)MPa,and(2.7±0.6)J/m²,respectively.Values of ISS and Gi indicate weak interface bonding,causing it susceptible to cracking under shear stress,while the large IFSS suggests that relative fiber sliding is inhibited after interface debonding,hindering fiber pull-out.The obtained interfacial properties can predict the proportional limit stress(σPLS)accurately according to the ACK model.Based on the interfacial properties and the in-situ fiber strength(σfu),the tensile strength of 2.5D SiCf/SiC is predicted to be higher than the experimental value,which is related to the interfacial radial compressive residual stress and residual tensile stress endured by the fiber.关键词
2.5D SiCf/SiC/拉伸加/卸载/纤维推入/界面剪切强度/界面脱黏能/界面滑动应力Key words
2.5D SiCf/SiC composite/tensile loading/unloading/push-in/interfacial shear strength/interfacial debonding energy/interfacial sliding stress分类
通用工业技术引用本文复制引用
管皞阳,张立,荆开开,师维刚,王晶,李玫,刘永胜,张程煜..国产三代2.5D SiCf/SiC复合材料的界面力学性能[J].无机材料学报,2024,39(3):259-266,中插1,9.基金项目
"叶企孙"科学基金(U2241239)Ye Qisun Science Foundation(U2241239) （U2241239）
