Thermal and ablation properties of EPDM based heat shielding materials modified with density reducer fillers

Rallini, Marco; Puri, Ivan; Torre, Luigi; Natali, Maurizio

doi:10.1016/j.compositesa.2018.05.031

Cited by 52 publications

(27 citation statements)

References 32 publications

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“…All the samples possess higher heat capacity and the EHSMs of EK3 and Ma‐g‐EK3 are not showing notable variation from the virgin EPDM based EHSM whereas heat capacity of the uncompatibilized EHSM decreased. This may be due to the correlation between the heat capacity and density, wherein higher the number of voids present, lower the heat capacity …”

Section: Resultsmentioning

confidence: 99%

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

George

Panda

Biswal

et al. 2020

Polymers for Advanced Techs

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This work scrutinizes the utilization of ethylene propylene diene monomer rubber matrix (EPDM) with an embodiment of aramid fiber for the heat shielding applications in solid rocket motor (SRM). Aramid fibers are aromatic poly-paraphenylene terephthalamide, here deployed are Kevlar fibers (KF). However, the literature that encompasses the thermal and mechanical behavior with the fiber loading is reported nowhere else. The effect of fiber addition on the surface morphology and density was thoroughly studied, and it revealed that the EHSMs were of lower density to act as an efficient payload for the SRM. In this regard, the thermal conductivity, heat capacity, thermal diffusivity, fire behavior, and mechanical properties of the EPDM/KF-based EHSMs were explored. The results revealed that the EHSMs are thermally insulating and thermally stable material with balanced mechanical properties that can engender the thermal and mechanical strains of the rocket motor. Furthermore, other analytical techniques such as scanning electron microscopy and energy dispersive X-ray spectroscopy have been exploited to monitor the performance of the char residues of the EHSM to delineate its performance in the fire atmosphere. K E Y W O R D S cone calorimetry, EHSM, Kevlar fiber, SRM, thermal conductivity 1 | INTRODUCTION Thermal protection systems (TPS) grounded on the base of polymeric ablative materials (PAMs) for the safeguard of hypersonic flights in the planetary atmosphere have been probed from the last decades.PAMs are also utilized to endow thermal insulation to the SRMs, which particularly depends on the prerequisite of the application, whether charring or noncharring. 1-3 The high char preservation capable phenolic resins are the foremost manoeuvers typically indentured for solid rocket motors (SRMs). On the other hand, when the charred material undergoes erosion, it necessitates for the fibrous incorporation into the matrix. On these grounds, fibers made of carbon, oxides, asbestos, or glass have been generally employed 4 ; moreover, highly performing organic fibers such as aramid fibers (Kevlar) and polyimide fibers are also used. 4,5 Besides this, micron 6 or nano 7,8 silica is prepended for the elevated ablation rate and char stability and diminished oxidation rate of the residue. Moreover, in the case of flexible insulators that endures for high strain capable applications are met with elastomeric heat shielding materials (EHSMs).Among the various elastomeric materials for SRMs, EPDM is of paramount importance representing an excellent matrix for SRM liners.EPDM holds for superior thermal resistance, reliable mechanical

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Section: Resultsmentioning

confidence: 99%

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

George

Panda

Biswal

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

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“…The material containing 20 phr of microspheres evidenced the best tradeoff among all properties. Perlite has also been tested, but did not survive the manufacturing process used [69].…”

Section: Fibers and Fillers In Ehsmmentioning

confidence: 99%

“…Fillers generally employed in EHSM are conventional mineral oxides (as powders) and carbon black [50]. However, in recent years, materials such as wollastonite [11], silicate microspheres [40,69], POSS [54], nanofibers [58], nanoclays [70], nanosilica, nanoalumina, and carbon nanotubes [71,72] have been utilized.…”

Section: Fibers and Fillers In Ehsmmentioning

confidence: 99%

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

et al. 2020

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This review addresses a comparison, based on the literature, among nitrile rubber (NBR), ethylene-propylene-diene-monomer rubber (EPDM), and polyurethane (PU) elastomeric heat shielding materials (EHSM). Currently, these are utilized for the insulation of rocket engines to prevent catastrophic breakdown if combustion gases from propellant reaches the motor case. The objective of this review is to evaluate the performance of PU–EHSM, NBR–EHSM, and EPDM–EHSM as insulators, the latter being the current state of the art in solid rocket motor (SRM) internal insulation. From our review, PU–EHSM emerged as an alternative to EPDM–EHSM because of their easier processability and compatibility with composite propellant. With the appropriate reinforcement and concentration in the rubber, they could replace EPDM in certain applications such as rocket motors filled with composite propellant. A critical assessment and future trends are included. Rubber composites novelties as EHSM employs specialty fillers, such as carbon nanotubes, graphene, polyhedral oligosilsesquioxane (POSS), nanofibers, nanoparticles, and high-performance engineering polymers such as polyetherimide and polyphosphazenes.

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“…Ethylene propylene diene monomer (EPDM) represents one of the most widely studied and used elastomeric matrix due to its excellent resistance to oxidation, ozonation, and weathering effects, which is essential for military purposes. [ 8–17 ] Nitrile rubber (NBR) and polyurethane is also used for EHSMs. [ 18–22 ] However, some intrinsic shortcomings, such as, a limited shelf life, high density, and poor low temperature properties limit its further application.…”

Section: Introductionmentioning

confidence: 99%

A comparison of ablative resistance properties of liquid silicone rubber composites filled with different fibers

Zhang

Yan

Zhou

et al. 2020

Polymer Engineering & Sci

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Flexible ablative materials play a key role in thermal protection systems to protect space vehicles during hypersonic flight missions. In this work, epoxy resin modified liquid silicone rubber was adopted as elastomeric matrix. Two inorganic fibers (carbon fibers (CF) and quartz fibers (QF)) and two organic fibers (aramid fibers (AF) and poly (p‐phenylene benzobisoxazole) fibers (PBO)) were chosen as functional fillers. The ablation resistance and thermal insulation properties were evaluated using oxyacetylene torch test. Microstructure and phase composition of the char layer was fully characterized to investigate the ablation mechanism. SEM observations revealed that the fibers are well dispersed and integrated in the matrix. TGA analysis indicated that the inorganic fibers possess significantly higher thermal stability than organic fibers. In addition, a molten silica film can be formed on the material surface, which can exert a better thermal protection effect on the matrix. Furthermore, the ablation test shows that the linear ablation rate decreases first and then increases with an increase of fiber content. This work provides basic data to guide optimal selection of fibrous ablatives to enhance ablation performance.

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Thermal and ablation properties of EPDM based heat shielding materials modified with density reducer fillers

Cited by 52 publications

References 32 publications

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

A comparison of ablative resistance properties of liquid silicone rubber composites filled with different fibers

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