Porous Silicon Nitride Synthesis Via the Carbothermal Reduction and Nitridation of Silica/rf Gel Composite PDF Download
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Author:
Publisher:
ISBN:
Category : Carbon compounds
Languages : en
Pages : 160
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Book Description
The synthesis of porous silicon nitride, one of the most promising structural materials for filter at high-temperature applications, from silica/ RF gel composite which was prepared by combining sol-gel and polymerization methods with the use of silica, precursor was investigated. Silica/RF carbon composite was converted into porous silicon nitride via the carbothermal reduction and nitridation. From the results, 3-Amino propyl trimethoxysilane was found to be a suitable silica precursor for the synthesis of porous silicon nitride. It was also found that aging time of silica/RF gel does not affect the porosity of silicon nitride. Solvent exchange with t-butanol and nolar ratio of silicon and carbon that are used in the preparation of silica/RF gel are the major factor affecting in the porosity of silicon nitride. The reaction time for the carbothermal reduction and nitridation is an important factor affecting the agglomeration and sintering of silicon nitride particles.
Author:
Publisher:
ISBN:
Category : Carbon compounds
Languages : en
Pages : 160
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Book Description
The synthesis of porous silicon nitride, one of the most promising structural materials for filter at high-temperature applications, from silica/ RF gel composite which was prepared by combining sol-gel and polymerization methods with the use of silica, precursor was investigated. Silica/RF carbon composite was converted into porous silicon nitride via the carbothermal reduction and nitridation. From the results, 3-Amino propyl trimethoxysilane was found to be a suitable silica precursor for the synthesis of porous silicon nitride. It was also found that aging time of silica/RF gel does not affect the porosity of silicon nitride. Solvent exchange with t-butanol and nolar ratio of silicon and carbon that are used in the preparation of silica/RF gel are the major factor affecting in the porosity of silicon nitride. The reaction time for the carbothermal reduction and nitridation is an important factor affecting the agglomeration and sintering of silicon nitride particles.
Author:
Publisher:
ISBN:
Category : Silica
Languages : en
Pages : 196
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Book Description
Incorporation of silica into RF solution, which was prepared via the sol-gel polycondensation of resorcinol and formaldehyde with sodium carbonate as catalyst was investigated. The reaction between silica precursor and RF solution is quite violent and strongly exothermic. The addition of acetic acid into RF solution damages methylene and methylene ether bridges of the RF clusters, which enables the incorporation of increased amount of silica into the RF clusters. According to the experimental results, silica precursor (APTMS, MPTMS) incorporates into RF clusters at positions of hydroxyl group. Then, the silica/RF gel was converted into silica/carbon composite by pyrolysis before subjected to the carbothermal reduction and nitridation to synthesize silicon nitride/silicon carbide. The results indicated that temperature and porosity of silica/carbon composite does not affect the formation of silicon nitride or silicon carbide. Phase of the product depends upon chemical structure of silica/RF gel formed by polycondensation.
Author: Alberto Figoli
Publisher: Springer
ISBN: 9811056234
Category : Science
Languages : en
Pages : 388
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Book Description
This book analyses the sustainability of membrane operations applied on an industrial scale, as well as that of those under investigation on lab/pilot scales, covering also the preparation of both polymeric and inorganic membranes. It presents reverse osmosis in desalination, membrane bioreactors for municipal wastewater treatment and pressure-driven industrial wastewater treatment in agrofood and textile fields as examples of industrial membrane operations. Regarding the membrane processes still on a lab/pilot scale, the analysis includes membrane operations for the recovery of valuable products from wastewater streams, for the removal of toxic compounds from water/wastewater, and for zero liquid discharge approaches in desalination. The book offers a useful guide for scientists and engineers working in various fields, including membrane technology, separation, desalination, and wastewater treatment. Alberto Figoli and Alessandra Criscuoli are both Senior Researchers at the Institute on Membrane Technology (ITM-CNR), Italy.
Author: Jyothi Suri
Publisher:
ISBN:
Category :
Languages : en
Pages : 320
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Book Description
Author: Magnus Ekelund
Publisher:
ISBN: 9789171469090
Category : Silicon nitride
Languages : en
Pages : 58
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Book Description
Author: Karen J. Buechler
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Book Description
Author: Bernard George Durham
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
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Book Description
![Synthesis of Sub-micron [alpha]-si3n4 Powders Via Carbothermal Nitridation Using Novel Carbon Coated Silica Precursors PDF](https://books.google.com/books/content/images/frontcover/t8_tNwAACAAJ?fife=w80-h100)
Author: Swaroop Kaza
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Book Description
Author: Emiliano Jose Hierra
Publisher: Nova Science Publishers
ISBN: 9781619428652
Category : Silicon nitride
Languages : en
Pages : 0
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Book Description
Silicon nitride (Si3N4) ceramic is used in numerous applications because of its superior properties, such as high-temperature strength, good oxidation resistance and low thermal expansion coefficient. In this book, the authors present current research in the study of the synthesis, properties and applications of silicon nitride. Topics include the optical and vibration properties of silicon rich nitride; high temperature oxidation of silicon nitride based ceramics; low temperature preparation of phosphate bonded silicon nitride ceramics with high mechanical strength; the SPS-sintering process and use of ceramics for high-temperature engineering applications; synthesis and properties of silicon nitride coatings; and the use of silicon nitride as biomaterial.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
Prepare silicon nitride-silicon carbide composite powders by carbothermal reduction of crystalline silica powder, carbon powder and, optionally, crystalline silicon nitride powder. The crystalline silicon carbide portion of the composite powders has a mean number diameter less than about 700 nanometers and contains nitrogen. The composite powders may be used to prepare sintered ceramic bodies and self-reinforced silicon nitride ceramic bodies.
