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Hydrolysis Precipitation Method of Continuous Synthesis of SiC Powder

Author: LiJin
Tutor: ZhangNing
School: Shenyang University
Course: Materials Science
Keywords: Pour - hydrolysis precipitation Continuous synthesis Silicon carbide powder Silicon carbide precursor
CLC: TB383.3
Type: Master's thesis
Year: 2010
Downloads: 62
Quote: 0
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Abstract


Many ceramic materials, silicon carbide due to its high hardness, high temperature stability, low expansion coefficient and thermal conductivity performance superior electrical, physical and chemical characteristics of the SiC material and SiC-based ceramic composites in defense, chemicals, machinery, metallurgy, electronics and other fields shows superiority can not be replaced by other materials, has been the focus of world scholars. But a single component, superior performance SiC ultrafine powder preparation of equipment and raw materials have higher production efficiency is low, the yield is not high and difficult to achieve industrialization, leading to SiC ultrafine powder preparation costs are high SiC material, making expensive, severely limiting the promotion and application of high performance SiC material. The papers by selecting the source of a wide range of inexpensive TEOS as a silicon source and carbon source and sucrose, pour hydrolysis precipitation method to replace the traditional titration sol - gel method, not only the precursor preparation process is simple, work efficiency, but also successfully prepared monodisperse nanoscale SiC precursor, which is one of the main features of this paper; introduction of continuous synthesis method significantly improve the yield of SiC powder and prepared a single component, uniform particle size distribution of the granular ultrafine SiC powder, which is characterized by simple operation, suitable for industrial production, which is another important feature of this thesis. Therefore, this thesis has certain reference value for the mass production of low cost SiC ultrafine powder. The promotion will play a positive role in promoting the industrialization of high performance SiC material, so the thesis has important and far-reaching significance. Many studies show that improve the uniform degree of mixing of the reactants starting materials greatly affect the synthesis temperature and the morphology of the SiC powder. The TEOS and sucrose as the main raw material for ethanol as co-solvent, the use of ammonia as a catalyst. Pour hydrolysis precipitation method continuous synthesis prepared by the superior performance of ultrafine SiC powder. Thesis, the polymerization mechanism of the hydrolysis of the TEOS and deionized water content, the content of the catalyst of ammonia, the content of anhydrous ethanol, and the impact of the hydrolysis temperature and the hydrolysis time of the precursor particle size; paper also discusses continuous -synthesis of SiC powders thermodynamics of sucrose amount of synthesis temperature and push the boat running speed of the phase composition of SiC powder material. The study results showed that the precursor of SiC-pour hydrolysis precipitation process: hydrolysis temperature of 25 ° C, hydrolysis time of 1h; optimum composition: TEOS: EtOH: H20: NH3 ? H2O = 100:150 : 100:20 continuous synthesis of SiC powders synthesis process: speed 0.5cm/min push the boat running synthesis temperature of 1550 ° C, and came to the sucrose content. Continuous synthesis process, the preparation of a particle size of about 100nm granular ultrafine SiC powder and SiC powder particle shape rules reunion dispersion; Continuous synthesis prepared and tested calculation derived yield of SiC powder 90g / h, suitable for industrial promotion use.

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