空间高稳定碳/碳蜂窝夹层结构制备及性能

Preparation and Properties of Carbon/Carbon Honeycomb Sandwich Panels for Space Ultra-Stable Structures

针对空间高稳定结构在极端环境下的灵敏度和稳定性需求,提出一种新型高稳定、高承载的轻质碳/碳(C/C)蜂窝夹层结构方案。碳/碳蜂窝夹层结构由化学气相渗透(CVI)致密化获得的整体碳/碳蜂窝和面板经胶粘剂粘接集成,通过评价蜂窝、面板以及夹层结构的内部质量、力学性能及热物理性能,展示了碳/碳蜂窝夹层结构在承载和尺度稳定性方面的优势。研究结果表明,典型特征碳/碳蜂窝承载性能稳定,平压强度>10 MPa,L/W向剪切强度>4 MPa,典型特征碳/碳蜂窝夹层结构热膨胀系数低,满足空间环境条件下面内热膨胀系数绝对值低于1×10^-7/℃的高稳定设计需求。

A new kind of carbon/carbon(C/C)honeycomb sandwich panels has been presented with the aim to make ultra-stable structures that could offer high-level stability requested by space high performances instruments. The C/C skin and C/C honeycomb are prepared by chemical vapor infiltration(CVI) and the organic joining technology is used to bond the C/C sandwich. The mechanical behaviors of the sandwich panels have been analyzed by the out-of-plane compression, in-plane compression and three-point bending experiments. The non-destructive testing method is used for testing the application conditions of the panels’ inner quality. The thermal behaviors of the panels have been analyzed by the thermal conductivity and expansion tests. The results indicate that the C/C sandwich has a very low thermo-elastic sensitivity and the mechanical properties meet the background requirements. The C/C honeycomb’s out-of-plane compression strength is greater than 10 MPa, the L/W shear strength is greater than 4 MPa,and the C/C sandwich’s in-plane coefficient of thermal expansion is less than 1×10^-7/℃.