Microstructure and phase evolution in pyrolysed short fibre reinforced polymethylsilsesquioxane-phenolic interpenetrating networks

Alex, Ancy Smitha; Bhuvaneswari, S.; Chandran, C. Sarath; Jayalatha, T.; Sekkar, V.; Gouri, C.

doi:10.1016/j.jaap.2017.11.006

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…13. Firstly, SiO and CO gas sources were produced with the reduction of SiO 2 and CO 2 through reactions ( 1)-( 3) [46]. SiC embryos were formed from heterogeneous nucleation by the solid-gas interaction of reaction ( 4), but the growth of SiC nanowires is determined by reaction (5) with gas-gas interaction [47,48].…”

Section: Mechanism Discussionmentioning

confidence: 99%

In-Situ Fabrication of ZrB2-ZrC-SiCnws Hybrid Nanopowders With Tunable Morphologies of SiCnws

Liu

Yuan

Wang

et al. 2021

Preprint

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SiC nanowires (SiCnws) with different morphologies have great potential for the reinforcement of ceramic materials. But it is a big challenge in the in-situ synthesis of SiCnws in the ceramic powders which is critical to ensure high reinforcing effects. For the reinforcement of ZrB2-ZrC composites, a simple method is developed to in-situ fabricate SiCnws with various morphologies in nano-sized ZrB2-ZrC powders through pyrolyzing ZrB2-ZrC-SiC gel precursors. The prepared ZrB2-ZrC ceramic powders have mean diameter of about 100 nm with uniformly distributed SiCnw in morphologies of nanocylider, bead-like, bamboo-shape with tunable nodes, chain-like and hexagonal prisms were prepared by optimizing the preparation process. Moreover, the SiCnws were in a diameter of ranging from 100 to 400 nm, while the length was controlled from tens to hundreds of microns. The generation of ZrB2/ZrC can determine the formation of SiCnws with specific morphologies by producing CO gas to affect the local supersaturation of the SiO and CO vapors. The study provides an opportunity for fabricating SiCnw reinforced ceramic materials with enhanced strengthening effect and also overcome its critical fabrication process.

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Section: Mechanism Discussionmentioning

confidence: 99%

In-Situ Fabrication of ZrB2-ZrC-SiCnws Hybrid Nanopowders With Tunable Morphologies of SiCnws

Liu

Yuan

Wang

et al. 2021

Preprint

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“…With the development of aerospace industry, common PR cannot meet the needs of TPS, and its poor mechanics and brittleness also limit its development 13 . Attempts have been made to improve the properties of PR by introducing, nanocomposites, fibers, and so forth 5,14–17 …”

Section: Introductionmentioning

confidence: 99%

“…13 Attempts have been made to improve the properties of PR by introducing, nanocomposites, fibers, and so forth. 5,[14][15][16][17] Polyhedral oligomeric silsesquioxane (POSS) has an organicinorganic hybrid structure, excellent thermal stability, and can improve its compatibility by introducing groups, so it is an ideal structure for preparing nano-hybrid materials. [18][19][20][21][22][23][24][25] POSS was synthesized from hydrolysis-condensation process of silanes with halogen or alkoxy groups.…”

mentioning

confidence: 99%

Thermal protection materials based on epoxy‐containing and phenyl‐containing polyhedral oligomeric silsesquioxane modified phenolic resin and phenolic resin/carbon fiber composites

Yang

Li²,

Zhang

et al. 2023

Polymers for Advanced Techs

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Epoxy‐containing and phenyl‐containing polyhedral oligomeric silsesquioxane (EP‐POSS) and EP‐POSS modified phenolic resin (PR) was prepared, and its mechanical, thermodynamic and ablative properties were characterized. The results show that EP‐POSS can effectively improve the mechanical properties, thermal stability and ablative performance of PR. In the process of ablative, EP‐POSS decomposition forms a protective layer of silica, which covers the surface of the material, slows down the erosion of the internal material by high temperature heat flow, and effectively reduces the ablative rate of the material. EP‐POSS modified PR/CF (carbon fiber) composite was prepared and its ablative performance was studied. The results show that the modified material has excellent ablative resistance, and its linear ablative rate is close to 0.

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“…For phenolic resin materials, phenolic resin-based carbon-carbon composites, and pyrolytic short fiberreinforced polymer resin matrix composites, Ko et al [5], Tzeng and Chr [6] (as shown in Figure 3), and Alex et al [7] studied the microstructure of pyrolyzed materials at different temperatures by means of Raman spectroscopy, X-ray diffractometer, and scanning electron microscope separately. For polymer-derived silicon carbide ceramic composites, Santhosh et al [8] studied the effects of pyrolysis temperature on the microstructure and thermal conductivity of 2 International Journal of Aerospace Engineering polymer-derived silicon carbide ceramic composites by TG, FT-IR, TEM, and SEM.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Multiscale Heat Transfer Characteristics of Resin-Based Ablative Material under Aerodynamic Heating

Gao,

Deng,

Han

et al. 2023

International Journal of Aerospace Engineering

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This paper is aimed at investigating the microstructure evolution of resin-based ablative materials under aerodynamic heating. The microstructure, morphology, material density, and thermophysical parameters at different positions of the material after aerodynamic heating were deeply studied. The changes in the microstructural characteristics of materials caused by complex reaction processes were investigated, including microstructural morphology, porosity, the overlap relationship between microstructural components, and the mutual positional relationship. The relationship between microstructural evolution and material heat transfer is discussed. By analyzing the heat transfer mechanism and heat transfer path of the microstructure, combing with the analysis results of the evolution of the microstructure and the physical properties of the material, multiscale heat transfer unit cell models were established to predict the equivalent thermal conductivity. Thereby, the evolution of physical properties and microstructure of resin-based ablative materials under aerodynamic heating and the relationship between microstructure evolution and heat transfer process are obtained. It can improve the accuracy of ablative heat transfer simulation. In addition, it can provide reference for the process design of ablative materials and promote the application and development of ablative materials in the field of aircraft.

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Microstructure and phase evolution in pyrolysed short fibre reinforced polymethylsilsesquioxane-phenolic interpenetrating networks

Cited by 7 publications

References 35 publications

In-Situ Fabrication of ZrB2-ZrC-SiCnws Hybrid Nanopowders With Tunable Morphologies of SiCnws

In-Situ Fabrication of ZrB2-ZrC-SiCnws Hybrid Nanopowders With Tunable Morphologies of SiCnws

Thermal protection materials based on epoxy‐containing and phenyl‐containing polyhedral oligomeric silsesquioxane modified phenolic resin and phenolic resin/carbon fiber composites

Microstructure Evolution and Multiscale Heat Transfer Characteristics of Resin-Based Ablative Material under Aerodynamic Heating

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