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Download fileEffect of Mesophase Pitch Incorporation on the Ablation Behavior and Mechanism of Phenolic Composites
journal contribution
posted on 2022-03-29, 13:03 authored by Yisen Huang, Haoruo Zhang, Xueqin Zhang, Liwei Yan, Youquan Ling, Huawei Zou, Yang Chen, Mei LiangPhenolic resin plays a critical role
in ablative thermal protection
materials. However, its ablation and insulation properties need to
be further improved to meet the growing requirements of the entire
aerospace industry. In this work, composites are altered with various
loadings of mesophase pitch (MP) to make mesophase pitch-modified
boron-phenolic resin (BPR) composites (MPBPR). The compressive strengths
of carbonized MPBPR composites are significantly improved (optimally
by 2.7 times) via this modification, indicating the improved mechanical
performance of MPBPR composites under high temperatures. Results reveal
that the obtained MPBPR composites show better ablation resistance
and thermal insulation performance under oxyacetylene flame. The linear
ablation rates (4 MW/m2, lasting for 30 s) of the composites
with 10 and 20 wt % MP are reduced by 41.5 and 55.4% compared to that
of neat BPR. Meantime, MPBPR composites exhibit lower back-face temperature
during the ablation process. Furthermore, results also show that the
introduction of MP can effectively avoid the growth of large transversal
microcracks, increase the proportion of micropores in the ablated
char layer, and simultaneously improve the graphitization of resultant
char. Both the microporous and graphitic structures of the residual
char contribute to the improved ablation and insulation properties
of MPBPR composites. The abovementioned results indicate that these
MP-modified boron-phenolic resins are promising materials for application
in a thermal protection system.
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Keywords
thermal protection systemlarge transversal microcracksentire aerospace industrythermal insulation performanceresults also showresidual char contributeabovementioned results indicateablated char layermesophase pitch incorporationmake mesophase pitchinsulation properties needlinear ablation ratesimproved mechanical performancecarbonized mpbpr compositesmesophase pitchinsulation propertiesresults revealresultant charmpbpr compositesmpbpr ).various loadingssimultaneously improvesignificantly improvedpromising materialsphenolic resinsphenolic resinoxyacetylene flamemodified boronimproved ablationhigh temperaturesgrowing requirementsgraphitic structuresface temperatureeffectively avoidcritical rolecompressive strengthsablation processablation behavior7 times20 wt