Synthesis of Ultrafine Beta-silicon Carbide Powders in Thermal Plasmas PDF Download
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Author: Peter Chuen-Sun Kong
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 416
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Author: Peter Chuen-Sun Kong
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 416
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Ultrafine powders of SiC, Si3N4, Ni, and Al2O3 have been prepared in a rf-plasma reactor, utilizing an induction plasma tube designed at Los Alamos. The primary particle size of the ceramic powders ranges from 5 to 50 nm. Silicon carbide and alumina are ultrapure crystalline powders, while silicon nitride is amorphous for surface areas greater than 100 m2/g. Plasma nickel powder will sinter to full density at 1073 K.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Feasibility study for the plasma synthesis of high purity ultrafine powders of silicon carbide, with special attention given to raw material and energy cost in the selection of the reaction route and the reactor design used. Priority was given to the possible use of relatively low-cost raw materials such as silica or elemental silicon as starting material in favour of more expensive traditional feedstocks such as silane or silicon tetrachloride used by earlier investigations in this field. The proposed approach is based on the direct carburization of silicon vapour/condensed droplets using methane as quench gas.
Author:
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Category :
Languages : en
Pages :
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Ultrafine, ultrapure silicon carbide powder has been produced by reaction of silane and methane in a high temperature rf plasma. Preliminary studies include the effect of gas composition and of powder (plasma temperature) on the stoichiometry of the powder. The carbon-to-silicon ratio of the powder was varied from 1.0 to 1.9 by changing the process conditions. The powder has a BET surface area of 101 m2/g, which is equivalent to a particle diameter of 18.5 nm. A particle size in the range of 10 to 20 nm was measured by transmission electron microscopy. X-ray diffraction results indicate a domain size of 7.5 nm and a crystal structure of beta (cubic) silicon carbide. Spectrographic analysis shows that metallic impurities are lower than high quality grade commercial powder. Because of the high surface area, the powder must be stored and processed in an inert atmosphere to prevent severe contamination with oxygen.
Author: A.W. Weimer
Publisher: Springer Science & Business Media
ISBN: 9400900716
Category : Technology & Engineering
Languages : en
Pages : 675
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Book Description
Carbide, Nitride and Boride Materials Synthesis and Processing is a major reference text addressing methods for the synthesis of non-oxides. Each chapter has been written by an expert practising in the subject area, affiliated with industry, academia or government research, thus providing a broad perspective of information for the reader. The subject matter ranges from materials properties and applications to methods of synthesis including pre- and post-synthesis processing. Although most of the text is concerned with the synthesis of powders, chapters are included for other materials such as whiskers, platelets, fibres and coatings. Carbide, Nitride and Boride Materials Synthesis and Processing is a comprehensive overview of the subject and is suitable for practitioners in the industry as well as those looking for an introduction to the field. It will be of interest to chemical, mechanical and ceramic engineers, materials scientists and chemists in both university and industrial environments working on or with refractory carbides, nitrides and borides.
Author: Robert Miles Young
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
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Author: Vasanth Sai Cattamanchi
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Author: John K. Alley
Publisher:
ISBN:
Category : Silicates
Languages : en
Pages : 28
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Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 696
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 940
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