文献类型：期刊文献

英文题名：Transient energy dissipation mechanism of lightweight nanoporous phenolic composites under ultrahigh heat-flux laser ablation

作者：Li, Liang[1];Zong, Yongtao[1];Wang, Peng[1];Cai, Hongxiang[1];Yao, Jiaxin[1];Su, Zhe[3];Luo, Yi[3];Liang, Xiubing[2];Wang, Xiaojing[2];Niu, Bo[1,3];Long, Donghui[1,3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Natl Innovat Inst Def Technol, Adv Interdisciplinary Technol Res Ctr, Beijing 100071, Peoples R China;[3]Suzhou Lab, Struct Mat Res Dept, Suzhou 215000, Peoples R China

年份：2026

卷号：228

外文期刊名：INTERNATIONAL JOURNAL OF THERMAL SCIENCES

收录：;EI(收录号：20261920674432);WOS:【SCI-EXPANDED(收录号:WOS:001766511800001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 52472095 and U2341291) and Natural Science Foun-dation of Hubei Province (202SAFD040) .

语种：英文

外文关键词：Nanoporous phenolic composites; Laser ablation; Ablation mechanism; Finite element model

摘要：Lightweight nanoporous phenolic composites (NPCs) show promise for thermal protection systems, yet their energy-dissipation mechanisms under ultrahigh transient heat fluxes remain insufficiently resolved. Here, we systematically investigate the energy-dissipation behavior of quartz- and carbon-fiber reinforced NPCs (Qf/NPCs and Cf/NPCs). Remarkably, carbon-fiber reinforcement reduces linear recession by up to 60.6% relative to quartz-based analogues at equivalent fiber density and resin content, owing to its superior thermal stability and coherent carbonized barrier. Elevating fiber density augments in-plane thermal conductivity and promotes lateral heat dissipation, yielding reductions in linear ablation rate of 34.7% for Qf/NPCs and 46.1% for Cf/NPCs when increasing density from 0.16 to 0.40 g cm(-3) at 25 wt% resin. Higher resin content produces a denser matrix that suppresses heat penetration and confines pyrolysis gases, reducing linear ablation rate by 61.4% and 72.1% when comparing 45% and 25% formulations at 0.16 g cm(-3). Furthermore, a finite-element model, integrating resin pyrolysis, gas transport, and solid-phase transitions, reveals a flux-dependent transition from oxidationdominated (net exothermic) to sublimation-dominated (strongly endothermic) ablation, accompanied by a shift in internal pressure control from resin content (low flux) to ablation depth (high flux). These findings identify the structural parameters governing NPC ablation and inform the design of lightweight ablative composites.