Polyarylacetylene as a novel graphitizable precursor for fabricating high-density C/C composite via ultra-high pressure impregnation and carbonization  

作　　者：Jiaxin Feng Ping Hu Yuan Cheng Yiming Wang Nan Qu Lu Zheng Liancai Xun Chi Zhang Guangdong Zhao Xinghong Zhang 

机构地区：[1]National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150001,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Journal of Materials Science & Technology》2024年第15期198-209,共12页材料科学技术（英文版）

基　　金：supported by the Major Program of National Natural Science Foundation of China(No.52293372).

摘　　要：High-density carbon/carbon(C/C)composite plays a critical role in the aerospace industry owing to excellent mechanical properties and resistance to ablation.However,traditional manufacturing relies on pitch precursor and hot isostatic pressure impregnation and carbonization(HIPIC)technology,which is time-consuming and expensive.In this study,we report an innovative method utilizing polyarylacetylene(PAA)resin and ultra-high pressure impregnation and carbonization(UHPIC)technology.The extremely high char yield of PAA resin(85 wt.%)and high isotropic pressure of UHPIC(over 200 MPa)promote the densification of the composite.As a result,we achieve a high-density(1.90 g/cm^(3))C/C composite with a high degree of graphitization(81%).This composite exhibits impressive properties,including flexural strength of 146 MPa,compressive strength of 187 MPa,and thermal conductivity of 147 W/(m K).When exposed to oxyacetylene flame at 3000 K for 100 s,it displays minimal linear ablation,with a rate of 1.27×10^(-2)mm/s.This study demonstrates the exceptional graphitizable characteristic of PAA resin,setting it apart from conventional resins.Our time-saving and cost-effective approach holds significant promise for aerospace applications,particularly in harsh aerodynamic heating environments.

关 键 词：C/C composite Resistance to ablation POLYARYLACETYLENE Ultra-high pressure impregnation and carbonization GRAPHITIZATION 

分 类 号：TB333[一般工业技术—材料科学与工程]