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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 6. Отображено 6.
08-01-2014 дата публикации

Preparation method of nano alumina sol and gel

Номер: CN103496724A
Автор: Zhang Hui, Yang Xiaobo, Lv Yi, Yu Youran, Zhang Tianxiang, Zhao Yingmin, Pei Yuchen, Wu Jianqiang
Принадлежит:

The invention provides a preparation method of nano alumina sol and gel, nano alumina particles are used as a raw material, lactic acid is used as a dispersing agent, and the high-solid-content nano alumina sol is obtained by combination of high speed stirring and dispersion by using a high-energy ball mill; under stirring, the prepared nano alumina sol is added with a certain amount of a hexamethylenetetramine water solution, and the nano alumina gel is obtained by heating for a certain time for gelatinization. The preparation method is simple and easy, the solid content of the nano alumina sol prepared by dispersing is equal to or more than 30%, and the nano alumina sol is small in particle size and uniform in distribution, and can stably exist for a long time in water.

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Номер записи: 1
11-12-2013 дата публикации

High-performance aerogel composite material, preparation method and equipment thereof

Номер: CN103435320A
Автор: Liu Xizong, Zhan Wanchu, Zhang Jicheng, Zou Junfeng, Zhang Hao, Zhao Xiaoling, Zhou Qing, Sui Peng, Jian Wenzheng, Zhao Yingmin
Принадлежит:

The invention provides a high-performance aerogel composite material, and a preparation method and equipment of the high-performance aerogel composite. The aerogel composite material comprises a silicon dioxide aerogel and a fiber material, wherein the silicon dioxide aerogel uses tetramethyl orthosilicate and water as raw materials and an alcohol solvent as a solvent to prepare a silica sol, and no gel catalyst is added in the silica sol. The equipment comprises a reaction part and a circulated cooling part. The method comprises the steps of preparing the sol, dipping glue, standing, gelatinizing, aging gel, dewatering, drying and the like. With the adoption of the method, materials with planar or abnormal shapes and multiple sizes can be conveniently and selectively prepared, the gelation time is controllable, no catalyst is needed, the kinds of raw materials are few, the operation is simple and convenient, and the environmental pollution is low. The material is excellent in heat-insulating ...

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Номер записи: 2
01-01-2014 дата публикации

Preparation method of porous silicon nitride ceramic material

Номер: CN103482981A
Автор: Zhang Hui, Lv Yi, Zhang Tianxiang, Wang Tao, Guo Shifeng, Pei Yuchen, Zhao Yingmin, Wu Jianqiang
Принадлежит:

The invention provides a preparation method of a porous silicon nitride ceramic material, which comprises the following steps: proportioning, injection molding and sintering. The method is simple in technique, does not need chemical reaction, addition of any organic pore forming agent or pressurization, and can be used for preparing a complex-shape product. The porous silicon nitride ceramic material has the advantages of higher biscuit strength, high uniformity and fewer inherent defects, and has higher density and strength than the silicon nitride-base porous ceramic materials prepared by other methods.

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Номер записи: 3
06-03-2013 дата публикации

Method for preparing self-toughening silicon nitride ceramics

Номер: CN102951906A
Автор: Yu Juanli, Yang Jinlong, Lv Yi, Zhang Tianxiang, Zhao Yingmin, Pei Yuchen, Zeng Qingchuan
Принадлежит:

The invention provides a method for preparing self-toughening silicon nitride ceramics, and the method comprises the following steps that first a silicon nitride foam ceramic billet is prepared, then sintered to prepare a silicon nitride crystal whisker skeleton body, and finally a silicon nitride organic precursor is dipped, cracked and made into ceramics and the self-toughening silicon nitride ceramics is prepared. According to the method for preparing self-toughening silicon nitride ceramics, the silicon nitride ceramic foam body is obtained by directly foaming; then the silicon nitride ceramic foam body is sintered; a long column-shaped beta-silicon nitride crystal bar is fully grown through the special structure of a large number of pore spaces of the ceramic foam when in sintering; the grown long column-shaped beta-silicon nitride (Si3N4) crystal bar is nearly fully filled in each foam pore in the silicon nitride foam ceramic body; the average slenderness ratio of the beta-Si3N4 crystal ...

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Номер записи: 4
31-07-2013 дата публикации

Method for preparing silicon nitride foam ceramic

Номер: CN103224405A
Автор: Yu Juanli, Yang Jinlong, Lv Yi, Zhang Tianxiang, Zhao Yingmin, Zeng Qingchuan, Wang Tao, Hun Bingli, Yu Youran
Принадлежит:

The invention provides a method for preparing silicon nitride foam ceramic. The method comprises raw material proportioning, raw material blending, pH adjustment, foaming molding curing and sintering. Through utilization of a carboxymethyl cellulose aqueous solution as a binder, foam system surface tension is reduced; slurry viscoelasticity is improved; foam slurry fluidity and stability are improved; a shrinking percentage in foam drying is low; a yield is high; foam stability is good; foam pore sizes are small; sintered body mechanical properties are excellent; and foam pore distribution is uniform. Through a direct mechanical stirring foaming technology, the silicon nitride foam ceramic having good foam stability and excellent mechanical properties is prepared, wherein under the premise of equal porosity, compared with silicon nitride foam ceramic prepared by the prior art, the silicon nitride foam ceramic provided by the invention has bending strength improved by 10 to 30%, and the ...

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Номер записи: 5
18-12-2013 дата публикации

Micro-ablation insulating material and preparation method thereof

Номер: CN103449825A
Автор: Su Lijun, Liu Bin, Zhang Fan, Song Han, Zou Junfeng, Zhang Hao, Zhou Yugui, Guo Hui, Zhao Yingmin, Pei Yuchen
Принадлежит:

The invention discloses a micro-ablation insulating material. The micro-ablation insulating material comprises an ablation resin material and a rigid thermal-insulation material, wherein the rigid thermal-insulation material comprises a ceramic base body and an aerogel material. The invention also provides a preparation method of the micro-ablation insulating material. The method comprises the steps of compounding the aerogel material and the ceramic base body to manufacture the rigid thermal-insulation material, compounding the rigid thermal-insulation material and the ablation resin material, and gelling, drying and curing the ablation resin material. The proportions of the rigid thermal-insulation material and the ablation resin material, and the composition and the structure of the composition of the rigid thermal-insulation material and the ablation resin material in the thickness direction can be adjusted according to different using requirements. The micro-ablation insulating material ...

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Номер записи: 6