Polymer-Derived Ceramics and Their Space Applications

Packirisamy, S.; Sreejith, K. J.; Devapal, Deepa; Swaminathan, B.

doi:10.1007/978-3-319-73255-8_31-2

Cited by 6 publications

(4 citation statements)

References 278 publications

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“…Triethoxy(vinyl)silane (C 8 H 18 O 3 Si, assay ≥97%, Nabond), tri ethoxy (methyl)silane (C 7 H 18 O 3 Si, assay ≥99%, Sigma-Aldrich Chemie GmbH), and boric acid (assay ≥99.5%, Merck Specialties) were used for the in-house synthesis of MVBS using the procedure reported earlier. MVBS was synthesized by stirring the three raw materials, viz., boric acid, triethoxy(vinyl)silane, and triethoxy(methyl)silane in a mole ratio of 1:.5:1.5 in a glass reactor under reflux in an oil bath maintained at 80 • C-85 • C under an argon atmosphere for 5 h. 8,9 The resulting solution containing ∼37 wt.% MVBS in ethanol was concentrated to 50 wt.% by distillation of ethanol under reduced pressure at 80 • C. The reaction scheme for the preparation of MVBS solution is presented in Figure S1. The wheat flour was procured from a local shop.…”

Section: Methodsmentioning

confidence: 99%

“…3,4 The incorporation of boron in SiOC glass further improves the oxidation resistance and makes the resulting SiBOC phase stable up to 1500 • C. 5,6 The SiOC and SiBOC glass-ceramic foams are realized from preceramic polymers such as polysiloxanes and polyborosiloxane, respectively. [7][8][9][10] Various processing techniques such as polymer foam replication, sacrificial templating, melt foaming using a blowing agent, emulsion templating, and 3D printing are employed for the synthesis of SiOC foams from preceramic polymers. [11][12][13][14][15][16][17][18][19] In polymer foam replication, a polysiloxane coated on the web and struts of polyurethane (PU) foam by infiltration of its solution followed by squeezing and drying is subsequently cross-linked and then subjected to pyrolysis to produce SiOC foam of pore structure similar to that of the PU foam.…”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of boron in SiOC glass further improves the oxidation resistance and makes the resulting SiBOC phase stable up to 1500°C 5,6 . The SiOC and SiBOC glass–ceramic foams are realized from preceramic polymers such as polysiloxanes and polyborosiloxane, respectively 7–10 . Various processing techniques such as polymer foam replication, sacrificial templating, melt foaming using a blowing agent, emulsion templating, and 3D printing are employed for the synthesis of SiOC foams from preceramic polymers 11–19 .…”

Section: Introductionmentioning

confidence: 99%

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Preparation of cellular SiBOC foams by thermo‐foaming of polymethylvinylborosiloxane–wheat flour dough

Painuly,

Saraswathy,

Prabhakaran

2023

Int J Applied Ceramic Tech

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A novel method for the preparation of SiBOC foams from a polymethylvinylborosiloxane (MVBS) solution in ethanol using wheat flour as a foam stabilizer and pore template has been reported. A dough prepared by mixing the MVBS solution and wheat flour undergoes foaming at 180°C due to the stabilization of bubbles created by ethanol vapor by the adsorption of wheat flour particles on their surface. The ceramization of the foamed body at 1500°C followed by burnout of carbon produced from the wheat flour results in SiBOC foams of hierarchical pore structure. The foam density (.68–.44 g cm−3), average cell size (1.81–.58 mm), compressive strength (3.9–1.7 MPa), and thermal conductivity (.33–.21 W m−1 K−1) decrease with an increase in wheat flour to MVBS weight ratio from .25 to 1. The population of smaller pores (∼5–50 μm) created by wheat flour particles on cell walls and struts increases with an increase in wheat flour to MVBS weight ratio. The presence of β‐SiC and turbostratic graphite nanodomains in amorphous SiBOC is evidenced by X‐ray diffraction and transmission electron microscopy analysis.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of cellular SiBOC foams by thermo‐foaming of polymethylvinylborosiloxane–wheat flour dough

Painuly,

Saraswathy,

Prabhakaran

2023

Int J Applied Ceramic Tech

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“…The absence of the application of SiOC screens in relevant engineering fields of application can be attributed to the natural brittleness of porous ceramics and the challenge of producing crackless porous ceramics that allow particle-free phase separation. Porous ceramics can be applied in applications such as catalyst support, energy harvesting, or filtration [ 20 , 21 , 22 ] and may offer some advantages compared to metallic screens such as chemical and thermal stability, relatively lower density, and thermal conductivity [ 23 , 24 ]. Relatively low values of thermal conductivity between 0.2 W m −1 K −1 and 2.0 W m −1 K −1 were reported for porous and non-porous SiOC, respectively, in a temperature range from 77 K to 1400 K [ 23 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

et al. 2023

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The development of porous ceramic screens with high chemical stability, low density, and thermal conductivity can lead to promising screen channel liquid acquisition devices (SC-LADs) for propellant management under microgravity conditions in the future. Therefore, SiOC screens with aligned pores were fabricated via freeze-casting and applied as a SC-LAD. The pore window sizes and open porosity varied from 6 µm to 43 µm and 65 % or 79 %, depending on the freezing temperature or the solid loading, respectively. The pore window size distributions and bubble point tests indicate crack-free screens. On the one hand, SC-LADs with an open porosity of 79 % removed gas-free liquid up to a volumetric flow rate of 4 mL s−1. On the other hand, SC-LADs with an open porosity of 65 % were limited to 2 mL s−1 as the pressure drop across these screens was relatively higher. SC-LADs with the same open porosity but smaller pore window sizes showed a higher pressure drop across the screen and bubble ingestion at higher values of effective screen area when increasing the applied removal volumetric flow rate. The removed liquid from the SC-LADs was particle-free, thus representing a potential for applications in a harsh chemical environment or broad-range temperatures.

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Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

et al. 2022

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This review aims to consolidate scattered literature on thermally sprayed coatings with nonionizing electromagnetic (EM) wave absorption and shielding over specific wavelengths potentially useful in diverse applications (e.g., microwave to millimeter wave, solar selective, photocatalytic, interference shielding, thermal barrier‐heat/emissivity). Materials EM properties such as electric permittivity, magnetic permeability, electrical conductivity, and dielectric loss are critical due to which a material can respond to absorbed, reflected, transmitted, or may excite surface electromagnetic waves at frequencies typical of electromagnetic radiations. Thermal spraying is a standard industrial practice used for depositing coatings where the sprayed layer is formed by successive impact of fully or partially molten droplets/particles of a material exposed to high or moderate temperatures and velocities. However, as an emerging novel application of an existing thermal spray techniques, some special considerations are warranted for targeted development involving relevant characterization. Key potential research areas of development relating to material selection and coating fabrication strategies and their impact on existing practices in the field are identified. The study shows a research gap in the feedstock materials design and doping, and their complex selection covered by thermally sprayed coatings that can be critical to advancing applications exploiting their electromagnetic properties.

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Polymer-Derived Ceramics and Their Space Applications

Cited by 6 publications

References 278 publications

Preparation of cellular SiBOC foams by thermo‐foaming of polymethylvinylborosiloxane–wheat flour dough

Preparation of cellular SiBOC foams by thermo‐foaming of polymethylvinylborosiloxane–wheat flour dough

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

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