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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 3. Отображено 3.
04-07-2023 дата публикации

Repair wax model material as well as preparation method and application thereof

Номер: CN116376299A
Автор: DONG YANG, QIU MANYAO, ZHENG GUANGYUAN, CAI XIAOLING, XIE TONG, HAN YATING, XIAO YONGHUI, WENG ZEYING, XU YONGJUN, CAI ZHUODI, TAN SHIZHI
Принадлежит:

The invention discloses a repairing wax model material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The repairing wax model material provided by the invention comprises the following raw materials in percentage by mass: 18-60% of cerate, 14-70% of industrial white oil, 1-10% of a plastic tackifier, 5-30% of resin, 0.5-8% of high-molecular synthetic wax and 0.5-8% of a high-molecular polymer. The prepared material for repairing the wax model is moderate in softening point, hardness and viscosity, high in surface smoothness, low in ash content, good in construction performance and good in compatibility with the wax model material, rough defects of the wax model can be effectively repaired, the hardness of the material for repairing the wax model can also be adjusted according to the proportion of the main body material, the applicability is high, the processing environment is simple, and the method is suitable for industrial ...

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Номер записи: 1
18-08-2023 дата публикации

Sulfur and nitrogen co-doped carbon catalyst as well as preparation method and application thereof

Номер: CN116603555A
Автор: LIU DAN, XU YONGJUN, CAI ZHUODI, TAN SHIZHI, YIN HUIBIN, MAO FEI, QIAN HAOJIE
Принадлежит:

The invention belongs to the technical field of catalyst materials, and particularly relates to a sulfur and nitrogen co-doped carbon catalyst as well as a preparation method and application thereof. The invention relates to a sulfur and nitrogen co-doped carbon catalyst, which is prepared from the following components in percentage by mass: 0.18 to 4.4 weight percent of S and 0.08 to 7.0 weight percent of N in the sulfur and nitrogen co-doped carbon catalyst. The preparation method of the sulfur and nitrogen co-doped carbon catalyst comprises the following steps: mixing a nitrogen-containing precursor, a sulfur-containing precursor and humin, and calcining to obtain the sulfur and nitrogen co-doped carbon catalyst. According to the invention, sulfur and nitrogen are introduced into the carbon material, so that the sulfur and nitrogen co-doped carbon catalyst has Lewis acid-base double active centers, S is an acidic active center, N is an alkaline active center, epoxide and carbon dioxide ...

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Номер записи: 2
21-07-2023 дата публикации

Mesoporous nitrogen-doped carbon catalyst as well as preparation method and application thereof

Номер: CN116459859A
Автор: LIU DAN, XU YONGJUN, CAI ZHUODI, TAN SHIZHI, YIN HUIBIN, MAO FEI, QIAN HAOJIE
Принадлежит:

The invention belongs to the technical field of catalyst materials, and particularly relates to a mesoporous nitrogen-doped carbon catalyst as well as a preparation method and application thereof. The invention relates to a mesoporous nitrogen-doped carbon catalyst which comprises the following components in percentage by mass: 0.5-5.5% of an N element, 0.5-5.5% of an N element and the balance of a carrier, and the specific surface area of the mesoporous nitrogen-doped carbon catalyst is 400-2200m < 2 >/g. Nitrogen is introduced into a carbon material, so that N in the mesoporous nitrogen co-doped carbon catalyst is used as an alkaline active site, hydroxyl and the defect of unsaturated element coordination generated by high-temperature roasting can be used as an acid active site, and CO2 and epoxide can be activated by the alkaline active site and the acid active site respectively; the catalyst has good catalytic performance and reusability; in addition, the mesoporous nitrogen co-doped ...

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Номер записи: 3