xerogel silicon carbide

Fabriion of Polystyrene Composite Reinforced with Silicon Carbide …

used for tire manufacturing due to its attractive properties when compared with styrene butadiene rubber. Silicon carbide synthesis is done by sol gel processing by using two different carbon precursors, called chitosan and graphin. Tetra ethyl ortho

Tubular and Rodlike Ordered Mesoporous Silicon …

Ordered mesoporous silicon carbide with hexagonal tubular and nanorod structure was prepared via infiltration of ordered mesoporous silica SBA-15 with various polycarbosilane precursors (PCS). Nanocasting of cubic KIT-6 silica resulted in the preparation …

Mesoporous Silicon Carbide via Nanocasting Method from Ludox® Xerogel …

Table S3. Textural characteristics of por-SiC obtained from 22 nm silica xerogel template, PCS: SiO2=0.7 by weight with addition of Ni(acac)2. The samples are indexed as SiC_T_X_Ni, where T is the pyrolysis temperature, X is the initial Ni : PCS ratio (% wt.). 2

The role of polymethylhydrosiloxane in the sol-gel …

2011/1/1· High surface area porous silicon carbide was synthesized via a modified sol-gel method. In the sol-gel method, furfuryl alcohol and tetraethoxysilane were used respectively as carbon and silicon precursors, polymethylhydrosiloxane (PMHS) was employed as a pore-adjusting agent for preparing a carbonaceous silica xerogel.

NOVEL HIGHLY POROUS CERAMIC AND METAL …

Representative of the highly porous ceramic and/or metal aerogel monolithic objects of the invention are ceramic and/or metal aerogels of Si, Zr, Hf, Ti, Cr, Fe, Co, Ni, Cu, Ru, Au, and the like. Examples include sturdy, shaped, highly porous silicon carbide (SiC 3

Beaded silicon carbide nanochains via carbothermal …

2006/5/26· Novel silicon carbide nanostructures, beaded nanochains, are prepared from the carbothermal reduction of a carbonaceous silica xerogel with cetyltrimethylammonium bromide and lanthanum nitrate as additives.

Carbon fiber/reaction-bonded carbide matrix for …

2012/12/1· Boron carbide is introduced inside the fiber preform from ceramic suspension whereas silicon carbide is formed by the reaction of liquid silicon with a porous carbon xerogel in the preform. The ceramic matrix composites obtained are near net shape, have a bending stress at failure at room temperature around 300 MPa and have shown their ability to self-healing in oxidizing conditions.

Morphology-Controlled Synthesis of Nanostructured …

Novel silicon carbide nanostructures, beaded nanochains, are prepared from the carbothermal reduction of a carbonaceous silica xerogel with cetyltrimethylammonium bromide and lanthanum nitrate as

Mesoporous silicon carbide: Via nanocasting of Ludox® …

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PRODUCTION, DIELECTRIC PROPERTY AND MICROWAVE ABSORPTION PROPERTY …

placed into drying oven to xerogel at 70 C The xerogel was ground and poured into a graphite crucible inside a sintering furnace, and then calcined at 1600 C for 3 h, 4 h or 5 h in a 0.1 MPa nitrogen atmosphere for carbothermal reduction reactions with heating

‪Parwani Rewatkar‬ - ‪Google Scholar‬

One-step synthesis of highly porous silicon nitride and silicon carbide from polymer-crosslinked silica aerogels

3C-SiC Nanowires In-Situ Modified Carbon/Carbon Composites …

(120 mm 80 mm 70 mm) were impregnated with SiO2 sol to obtain carbon felt/silica xerogel. Then the carbon felt/silica xerogel was placed at the center of a tube furnace. The heating rate was 10 C/min and the flow rate of Ar gas was controlled at 1.5–1.6 L/h

"Synthesis and appliions of ceramic (silicon carbide …

Highly porous ( > 80%) monolithic SiC and Si3N4, aerogels were prepared from compressed compacts of polyurea-crosslinked silica xerogel powders. The process is time efficient as solvent-exchange through powders is fast, and energy efficient as it bypasses drying with supercritical fluids.

Silicon Carbide with Uniformly Sized Spherical …

Mesoporous silicon carbide via nanocasting of Ludox® xerogel. RSC Advances 2016 , 6 (110) , 108828-108839. DOI: 10.1039/C6RA21972A.

Morphology-Controlled Synthesis of Nanostructured …

Novel silicon carbide nanostructures, beaded nanochains, are prepared from the carbothermal reduction of a carbonaceous silica xerogel with cetyltrimethylammonium bromide and lanthanum nitrate as

Investigation of microstructure and mechanical properties …

Nanocomposite aerogels are then fabried through sol-gel polymerization of novolac resin in the presence of silica xerogel powder. These nanocomposite aerogels are then converted to carbon/silica and carbon/silica/silicon carbide nanocomposite aerogels using pyrolysis and carbothermal reduction processes at 800 and 1500 °C, respectively.

Influence of the pH on the Morphology of …

This investigation deals with the use of the carbothermal reduction reaction of carbonaceous silica xerogel for synthesizing nanostructured SiC. The effect of the pH of the early‐prepared gel (EPG)

"Synthesis and appliions of ceramic (silicon carbide …

Highly porous ( > 80%) monolithic SiC and Si3N4, aerogels were prepared from compressed compacts of polyurea-crosslinked silica xerogel powders. The process is time efficient as solvent-exchange through powders is fast, and energy efficient as it bypasses drying with supercritical fluids.

‪Parwani Rewatkar‬ - ‪Google Scholar‬

One-step synthesis of highly porous silicon nitride and silicon carbide from polymer-crosslinked silica aerogels

Morphology-Controlled Synthesis of Nanostructured …

Novel silicon carbide nanostructures, beaded nanochains, are prepared from the carbothermal reduction of a carbonaceous silica xerogel with cetyltrimethylammonium bromide and lanthanum nitrate as

Carbon fiber /reaction-bonded carbide matrix for composite …

ceramic suspension whereas silicon carbide is formed by the reaction of liquid silicon with a porous carbon xerogel in the preform. The ceramic matrix composites obtained are near net shape, have a bending stress at failure at room temperature around 300 MPa

Carbon fiber/reaction-bonded carbide matrix for …

2012/12/1· Boron carbide is introduced inside the fiber preform from ceramic suspension whereas silicon carbide is formed by the reaction of liquid silicon with a porous carbon xerogel in the preform. The ceramic matrix composites obtained are near net shape, have a bending stress at failure at room temperature around 300 MPa and have shown their ability to self-healing in oxidizing conditions.

Synthesis and characterization of mesoporous silicon …

2003/6/19· A modified sol–gel method is proposed for the preparation of mesoporous silicon carbide. In this method, tetraethoxysilane (TEOS) and phenolic resin are used for preparing a binary carbonaceous silicon xerogel, and nickel nitrate is employed in the sol–gel process as a pore-adjusting reagent.

US20120077006A1 - High surface area silicon carbide …

Carbon aerogels can be coated with sol-gel silica and the silica can be converted to silicon carbide, improving the thermal stability of the carbon aerogel. A metal oxide-carbon composite includes

Synthesis and characterization of mesoporous silicon …

2003/6/19· A modified sol–gel method is proposed for the preparation of mesoporous silicon carbide. In this method, tetraethoxysilane (TEOS) and phenolic resin are used for preparing a binary carbonaceous silicon xerogel, and nickel nitrate is employed in the sol–gel process as a pore-adjusting reagent.

US8629076B2 - High surface area silicon carbide-coated …

Carbon aerogels can be coated with sol-gel silica and the silica can be converted to silicon carbide, improving the thermal stability of the carbon aerogel. A metal oxide-carbon composite includes a carbon aerogel with an oxide overcoat.

US8629076B2 - High surface area silicon carbide-coated …

Carbon aerogels can be coated with sol-gel silica and the silica can be converted to silicon carbide, improving the thermal stability of the carbon aerogel. A metal oxide-carbon composite includes