基于中间相沥青黏结剂与石墨片填料快速制备炭/炭复合材料及其电磁屏蔽与导热性能OA

Carbon/carbon(C/C)composites are ideal materials for electromagnetic inter-ference(EMI)shielding and thermal manage-ment in the aerospace field because of their low density.However,traditional C/C com-posites primarily rely on repeated densifica-tion to increase their EMI shielding effective-ness(SE),which not only increases density but also involves lengthy preparation cycles.We have constructed a unidirectional(1D)C/C composite using a matrix of mesophase pitch-derived carbon and graphite flakes,re-inforced with mesophase pitch-based carbon fibers.Using a one-step consolidation pro-cess produced by spontaneous assembly dur-ing heating,the open pores and a continuous conductive network give the composite an EMI SE of up to 83.97 dB in the 8.2-12.4 GHz(X-band).The material also has a thermal conductivity of 191.84 W·m-1·K-1 and an electrical conductivity of 6.50×104 S·m-1 along the fiber direction,together with a flexural strength exceeding 100 MPa,while having a bulk density of only 1.01 g·cm-3.This work therefore presents a short-cycle fabrication strategy for low-density C/C composites that integrate high EMI SE,efficient thermal management,and good mechanical properties.