Enhanced ablation resistance of carbon/phenolic composites based on mesophase pitch reinforced particles

Yue, Yaoqun; Huang, Yisen; Zou, Huawei; Chen, Yang; Liang, Mei

doi:10.1002/app.54529

Cited by 2 publications

(1 citation statement)

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“…For example, Chang et al reported an Al 2 O 3f -CF/Ph modified with HfB 2 and SiB 6 that achieves a linear ablation rate (LAR) of 0.06 mm/s [21]. Yue et al fabricated a mesophase pitchmodified CF/Ph, and its LAR was as low as 0.0082 mm/s [22]. In our previous work, MoSi 2 and B 4 C were incorporated into CF/Ph to develop a new ceramizable composite exhibiting satisfactory ablation resistance with an LAR of 0.013 mm/s [20].…”

Section: Introductionmentioning

confidence: 99%

A Novel Fused SiO2 and h-BN Modified Quartz Fiber/Benzoxazine Resin Ceramizable Composite with Excellent Flexural Strength and Ablation Resistance

Deng,

Lv,

Shi

et al. 2023

Polymers

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Hypersonic vehicles encounter hostile service environments of thermal/mechanical/chemical coupling, so thermal protection materials are crucial and essential. Ceramizable composites have recently attracted intensive interest due to their ability to provide large-area thermal protection for hypersonic vehicles. In this work, a novel ceramizable composite of quartz fiber/benzoxazine resin modified with fused SiO2 and h-BN was fabricated using a prepreg compression molding technique. The effects of the fused SiO2 and h-BN contents on the thermal, mechanical, and ablative properties of the ceramizable composite were systematically investigated. The ceramizable composite with an optimized amount of fused SiO2 and h-BN exhibited superb thermal stability, with a peak degradation temperature and residue yield at 1400 °C of 533.2 °C and 71.5%, respectively. Moreover, the modified ceramizable composite exhibited excellent load-bearing capacity with a flexural strength of 402.2 MPa and superior ablation resistance with a linear ablation rate of 0.0147 mm/s at a heat flux of 4.2 MW/m2, which was significantly better than the pristine quartz fiber/benzoxazine resin composite. In addition, possible ablation mechanisms were revealed based on the microstructure analysis, phase transformation, chemical bonding states, and the degree of graphitization of the ceramized products. The readily oxidized pyrolytic carbon (PyC) and the SiO2 with a relatively low melting point were converted in situ into refractory carbide. Thus, a robust thermal protective barrier with SiC as the skeleton and borosilicate glass as the matrix protected the composite from severe thermochemical erosion and thermomechanical denudation.

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Section: Introductionmentioning

confidence: 99%