Zirconium-Doped Hybrid Composite Systems for Ultrahigh-Temperature Oxidation Applications: A Review

Gudivada, Giridhar; Kandasubramanian, Balasubramanian

doi:10.1021/acs.iecr.8b05586

Cited by 17 publications

(12 citation statements)

References 137 publications

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“…Ablative materials play a vital role in the entire aerospace industry. − They are commonly used to shield aerodynamic surfaces, propulsion systems, and ground equipment from hyperthermal environments. , With the rapid development of military technology, space vehicles are required to withstand severe and long-term aerodynamic thermal-mechanical environments. , Simultaneously, the emergence of complex maneuvering structures poses new challenges to external heat shielding technology. In addition, the ablation behavior of the external thermal protection layer has a huge impact on the aerodynamic shape and flight accuracy of the vehicle, so it needs to meet the design requirements of controllable ablation.…”

Section: Introductionmentioning

confidence: 99%

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Yan

Cai

Luo

et al. 2021

ACS Appl. Polym. Mater.

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Ablative materials will behave differently when cruising under different hyperthermal environments. Herein, liquid silicone rubber-based composites were employed as a model system to investigate the response behavior of ablative materials under different hyperthermal environments. The computational fluid dynamics simulation was used to examine the flow field of oxyacetylene flame under different heat fluxes. Results indicated that oxyacetylene flames with different heat fluxes have almost identical temperature distributions when the ratio of O2 and C2H2 is fixed, but the scouring force of the gas flow increases significantly with increasing heat flux. The ablation performance decreased when the heat flux increased from 1 to 5 MW/m2, and the ablation mechanism is mainly attributed to the hybrid coupling between mechanical denudation and oxidative erosion. The ceramization reaction to form SiC tended to occur under an inert atmosphere. In addition, the carbon fibers locating on the periphery of the core region tended to assume an orientation state with the progression of the ablation process. This work elaborated the influence of heat flux intensities on the ablative behavior of liquid silicone rubber composites, which also served as a reference to developing other types of ablative materials.

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Section: Introductionmentioning

confidence: 99%

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Yan

Cai

Luo

et al. 2021

ACS Appl. Polym. Mater.

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“…46,47 In addition, the decomposed retained silica maintains the nanoporous network structure, which effectively blocks heat transfer; the pyrolytic free carbon enters the silica lattice through atomic diffusion to form the Si−O−C structure, which further improves the temperature resistance and oxidation resistance of the material. 48…”

Section: Mechanical Propertymentioning

confidence: 99%

Polybenzoxazine/Silica Hybrid Aerogels for Thermally Insulating Ablation

Zhang

Wang

et al. 2022

ACS Appl. Polym. Mater.

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Lightweight microablation thermal protection materials are one of the crucial factors contributing to the rapid development of next-generation aircrafts. However, the maintenance of a high mass residual and long-term antioxidant capacity of the matrix after bearing high-temperature aerobic environments remains a major challenge. Herein, we put forward a strategy for constructing polybenzoxazine/silica hybrid aerogels depending on the introduction into silica inorganic phases by different technologic preparation routes, possessing excellent thermal insulation, superior self-extinguishing properties, and outstanding thermal stability. In detail, the mass residual rate of polybenzoxazine/silica aerogels (PSAs) as-prepared could reach up to 40.19%, mainly due to the reinforced networking structure by the introduction of silica that would be preserved well due to the inorganic phase nature in the high-temperature oxidizing environment. The pore size of polybenzoxazine/silica/chitosan aerogels (PSCAs) is mainly distributed within 5–35 nm, which contributes to obtaining a low thermal conductivity (0.037 W m–1 K–1) due to the pore size being smaller than the mean free path of stationary air at normal temperature and pressure. PSAs and PSCAs both exhibit excellent self-extinguishing properties, attributed to the presence of a large number of aromatic ring structures and the introduction of the silica inorganic phase in polybenzoxazine itself. The microscopic morphology, crystalline shape, and Si-related chemical bonding of PSAs did not significantly change after muffle thermal treatment, including the three-dimensional network structure composed of polybenzoxazine and silica. This study provides a kind of approach for designing a thermal protection material matrix with high mass residual and excellent thermal insulation performance in the aerospace field.

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“…The sol–gel approach is a versatile and flexible synthetic strategy in the design of advanced multifunctional nanohybrids allowing for “one-pot” homogeneous incorporation of complex chemical multicomponents through formation of organic–inorganic hybrid materials. − In this work, we proposed a green synthesis of highly dispersed silica-supported metal catalysts using SP-assisted sol–gel. Following conventional sol–gel method, natural biopolymer of SP was introduced into the silica sol instead of specific organic chemicals such as citric acid, poly(vinyl alcohol), stearic acid, etc., and the schematic illustration of the preparation process was exhibited in Figure .…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Highly Dispersed Ni/SiO₂ Catalysts Using Natural Biomass of Sesbania Powder

Bai

Qiu

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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Recently, the ecofriendly techniques for production of nanohybrids using natural biomass have aroused great attention. This study reported a green and facile synthesis of highly dispersed supported metal catalysts using sesbania powder (SP) extracted from the natural sesbania plant. Well-dispersed Ni/SiO 2 catalysts were effectively fabricated by an SP-assisted sol−gel method. The influencing factors including the additive amounts of SP, metal loadings, and metal types on the physicochemical properties of supported catalysts were primarily investigated. The testing results revealed that the additive SP significantly facilitated the uniform distribution of metal species during heat treatment, leading to the existence of ultrasmall nanoparticles (<4 nm) and high dispersion of supported metal. The as-prepared Ni/SiO 2 catalysts were applied to the dry reforming of methane and demonstrated excellent catalytic performance due to the prevention of the agglomeration of Ni species and fabrication of Ni embedded in the silica framework through the introduction of SP.

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Zirconium-Doped Hybrid Composite Systems for Ultrahigh-Temperature Oxidation Applications: A Review

Cited by 17 publications

References 137 publications

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Polybenzoxazine/Silica Hybrid Aerogels for Thermally Insulating Ablation

Green Synthesis of Highly Dispersed Ni/SiO₂ Catalysts Using Natural Biomass of Sesbania Powder

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Zirconium-Doped Hybrid Composite Systems for Ultrahigh-Temperature Oxidation Applications: A Review

Cited by 17 publications

References 137 publications

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Polybenzoxazine/Silica Hybrid Aerogels for Thermally Insulating Ablation

Green Synthesis of Highly Dispersed Ni/SiO2 Catalysts Using Natural Biomass of Sesbania Powder

Contact Info

Product

Resources

About

Green Synthesis of Highly Dispersed Ni/SiO₂ Catalysts Using Natural Biomass of Sesbania Powder