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单质硅粉溶解法制备硅溶胶正交实验研究 总被引:1,自引:0,他引:1
研究了以单质硅粉为原料、水玻璃与氨水为复配催化剂制备硅溶胶的最佳工艺。通过正交实验设计,得出了硅溶胶的最佳制备条件:反应时间为7h,反应温度为80℃,水玻璃∶水∶硅粉=1∶20∶3(质量比)。 相似文献
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采用改良单质硅水解法工艺,经胶核制备和胶粒生长步骤制备硅溶胶.通过正交试验发现,对硅溶胶胶核平均粒径和硅粉转化率的综合影响因素大小顺序为硅粉加入量>水玻璃加入量>反应温度>反应时间.最优胶核制备条件为:硅粉加入量80 g;水玻璃加入量30 mL;反应温度90 ℃;反应时间6 h.此时得到的硅溶胶胶核粒径:7~9 nm,硅粉转化率:63%~66%,SiO2质量分数:16%~20%,Na2O质量分数:0.5%.经多次胶粒生长,可制得平均粒径20 nm、40 nm、60 nm、80 nm的硅溶胶产品. 相似文献
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硅溶胶及在涂料中应用 总被引:1,自引:0,他引:1
综述了硅溶胶生产的原理及方法.指出离子交换法和单质硅粉溶解法是当前硅溶胶生产的主要方法.并且单质硅粉溶解法具有较大发展潜力;归纳了硅溶胶在涂料中的应用及其实现途径,并针对硅溶胶的特点进行了分析。就目前硅溶胶与高分子聚合物乳液复合材料的制备提出了建议。 相似文献
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用金属硅粉制备硅溶胶的新工艺 总被引:5,自引:0,他引:5
本文根据硅粉和水在碱做催化剂的条件下能反应生成硅溶胶的原理,采用水玻璃和氨水做催化剂,对工艺中的反应温度,反应时间和硅粉和用量进行了研究和讨论,得出了制备硅溶胶较好的工艺条件。 相似文献
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以废切削液回收PEG后剩余的废砂为原料,采用酸溶和碱溶两种方法除去废砂中的多晶硅杂质,回收SiC微粉,并对两种方法的可行性及工艺条件进行了研究。结果表明,酸法除硅时,当HF浓度为4 mol/L,硝酸浓度为2 mol/L,温度为35℃,反应时间为70 min时,可使回收微粉中硅杂质含量在0.1%~0.2%。碱法除硅时,当NaOH的溶液3%左右,温度在70℃,反应时间2 h,可使回收微粉中硅杂质含量在0.2%~0.3%。粒度分析表明,酸法及碱法回收产品粒径分布均能满足指标要求,且碱法回收产品粒径分布与新砂一致。 相似文献
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Shengnan Jiang Shuaibo Gao Yang Liu Xiaohua Cui Xing Jin Donghui Wei Jian Kong Pengfei Xing 《International Journal of Applied Ceramic Technology》2020,17(1):130-137
In this paper, an efficient approach of recycling and reutilizing of silicon kerf waste (SKW) to prepare high-quality silicon carbide (SiC) by carbothermic reduction method is reported. SKW used as silicon source and petroleum coke as carbon source were submitted to the induction furnace for high-temperature smelting. The effects and mechanism of smelting temperatures and time on micro morphology, crystal structure, and purity of the obtained high-quality SiC were studied by X-ray diffractometry, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) as well as the Raman and photoluminescence (PL) analyses. Raman and PL analyses have verified the existence of SiC crystal types as 6H and 3C. The SEM and energy dispersive X-ray spectroscopy results show that the SiC particles size increases with the increasing smelting time and demonstrate that the iron impurity was enriched at the edges of SiC which can be easily removed by the subsequent acid leaching. The enrichment process can be accelerated by the increase of temperature. In addition, the carbothermic reduction mechanism of SKW was studied in detail. The obtained SiC powder after purification can reach 98.7% through this new method, which is of low cost, high efficiency, and environment friendly. 相似文献
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Nanocrystalline silicon carbide was synthesized from the precursor prepared by spray drying slurry of water glass and carbon black. The effect of process parameters, such as reaction temperature, reaction time and carbon content, on phase evolution, crystallite size and specific surface of the resulting samples were characterized by XRD, SEM and BET. The results show the powder produced in this process has a very fine crystallite size and high specific area and the reaction can be completed at 1550 °C for 2 h when the C/Si ratio is 5 or larger. In addition, the powder is of high purity, because sodium oxide in the precursor can be eliminated by the escape of sodium at high temperature. It is a simple and cost-efficient method to synthesize nanocrystalline silicon carbide using cheap and abundant water glass as silicon source. 相似文献
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为回收利用SiO2微粉,探究了以SiO2微粉为原料通过碳热还原法制备碳化硅粉体的最佳工艺条件;研究了分别以石油焦、活性炭和石墨粉为还原剂对冶炼效果的影响。在最佳碳质还原剂的基础上,研究了不同配碳比(还原剂与SiO2微粉的质量比为1∶3.5、1∶3、1∶2.5、1∶2、1∶1.5)和不同冶炼时间(15、30、45、60 min)对冶炼效果的影响。结果表明:石油焦、活性炭、石墨粉3种碳质还原剂中,石油焦的冶炼效果最佳;将石油焦与原料SiO2微粉以质量比1∶2进行混合,在中频感应炉中以1650℃冶炼45 min为最佳冶炼工艺条件;以此能够得到晶粒生长较好、品质较高的碳化硅粉体,碳化硅含量高达93.50%(w)。 相似文献
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《Journal of the European Ceramic Society》2017,37(1):69-74
Photovoltaic silicon is currently grown in silica crucibles coated with an oxidized silicon nitride powder, which acts as an interface releasing agent between the silicon and the crucible. A series of experiments was performed to study the reactions between coating components under high vacuum, varying the temperature, the holding time and the oxygen content in the coating. The results are discussed with the help of a simple analytical model taking into account the diffusive transport of reaction species from the inside of the porous coating to its surface and then their evaporation into the vapour phase. 相似文献
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B. I. Polyak E. V. Krivokorytov G. S. Rossikhina G. T. Sharafetdinov 《Glass and Ceramics》1997,54(5-6):182-185
The paper reports a study concerned with size reduction of corundum grog, sintered corundum (VK-94-1 ceramic waste), and silicon
carbide. Corundum and silicon-carbide powders with a specific surface area of 17 and 12 m2/g were obtained. They can serve as fillers for fire-resistant polymer-ceramic composites. Also, the silicon carbide powder
can be used as a finely divided additive to heat-stable corundum ceramic products.
Translated from Steklo i Keramika, No. 6, pp. 17–20, June, 1997. 相似文献
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