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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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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 4. Отображено 4.
02-07-2014 дата публикации

Preparation method of yttrium tetraboride

Номер: CN103896297A
Автор: SONG JUEMIN, LIU HUA, ZHU JIANJUN, WANG ZHIJIAN, CHENG YONG, LONG ZENGCHENG
Принадлежит:

The invention provides a preparation method of yttrium tetraboride. The preparation method comprises the following steps: mixing various raw materials for preparing yttrium tetraboride, wherein the raw materials include yttrium oxide and boron carbide, and the molar ratio of yttrium oxide to boron carbide is 1:(0.5-2.2); sintering the mixture obtained through mixing to obtain yttrium tetraboride. The preparation method of yttrium tetraboride, provided by the invention, is a method for reducing yttrium oxide by using carbon, the method is simple in technological process, and the purity of yttrium tetraboride in the product can be up to 99%.

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Номер записи: 1
14-01-2015 дата публикации

Titanium alloy and preparation method thereof

Номер: CN104278172A
Автор: ZHU JIANJUN, CHENG YONG, WANG ZHIJIAN, LIU HUA, SONG JUEMIN, LONG ZENGCHENG, MA LULU, ZHANG ZHEN
Принадлежит:

The invention provides a titanium alloy and a preparation method thereof. The titanium alloy comprises the following components in percentage by mass: 6-8% of Al, 2-4% of Mo, 1-3% of Nb, 1-3% of Sn, 1-3% of Zr, 0.5-2% of Cr, 0.01-0.2% of Sc, 0.1-1% of W and the balance of Ti. By adding a small amount of microalloying elements such as rare-earth metal Sc, W and the like into the high-temperature titanium alloy provided by the invention, the organization structure of the titanium alloy is effectively improved, crystal grains are refined, the parameters such as strength, plasticity, creep property and the like of the titanium alloy at 600 DEG C are well matched, and requirements in development and production of aeroengines are satisfied.

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Номер записи: 2
09-04-2014 дата публикации

Preparation method of scandium diboride

Номер: CN103708485A
Автор: LIU HUA, ZHU JIANJUN, WANG ZHIJIAN, SONG JUEMIN, PANG YING, CHENG YONG, LONG ZENGCHENG
Принадлежит:

The invention provides a preparation method of scandium diboride, which comprises the following steps: mixing a scandium-containing raw material and a boron-containing raw material, and sintering to obtain the scandium diboride, wherein the mol ratio of scandium in the scandium-containing raw material to boron in the boron-containing raw material is 1:(0.35-5). The purity of the scandium diboride prepared through the method provided by the invention can be up to 99%; and the preparation method is convenient, simple to operate and friendly to environment, produces less waste and fills up the blank of lacking a scandium diboride preparation method.

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Номер записи: 3
02-07-2014 дата публикации

Preparation method of yttrium diboride

Номер: CN103896298A
Автор: SONG JUEMIN, LIU HUA, ZHU JIANJUN, WANG ZHIJIAN, CHENG YONG, LONG ZENGCHENG
Принадлежит:

The invention provides a preparation method of yttrium diboride, which comprises the following steps: mixing yttrium tetraboride and another yttrium-containing material used as raw materials in a mole ratio of 1:(0.8-1.5), wherein the yttrium-containing material is Y and/or YH[x]X, and X=2-3; and sintering the raw materials to obtain the yttrium diboride. The preparation method provided by the invention uses the yttrium tetraboride and yttrium-containing simple substance as the raw materials to perform reaction under mild reaction conditions, and can be used for preparing the yttrium diboride with the purity of up to 99% without keeping overhigh vacuum pressure in the reaction process.

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Номер записи: 4