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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.
25-02-2015 дата публикации

Polyamide composite material with high thermal conductivity and high heat resistance and preparation method thereof

Номер: CN104371318A
Автор: LIU YINFENG, XU HUAGEN, ZHANG YANG, ZHOU HAIDI, WANG YUXIANG, ZHU YILI
Принадлежит:

The invention relates to a polyamide composite material with high thermal conductivity and high heat resistance and a preparation method thereof. The composite material comprises the following components in percentage by mass: 20%-50% of matrix resin, 40%-65% of composite heat-conducting fillers, 4%-12% of a halogen-free flame retardant, 0.5%-2% of a coupling agent, 0.2-1% of an antioxidant and 0.2%-1% of a lubricating dispersant. PA46 resin with a symmetrical molecular chain structure and high crystallinity is taken as the matrix resin; different heat-conducting fillers with different shapes and particle sizes are added to be overlapped between the heat-conducting fillers; and meanwhile, a small amount of flame retardant is added, so that the polyamide composite material disclosed by the invention has excellent heat-conducting property, flame retardant property and insulating property, and meets the operating requirements of electronic and electrical appliances, is high in design freedom ...

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Номер записи: 1
07-12-2021 дата публикации

Memory cell arrangement and methods thereof

Номер: US0011195589B1
Автор: Johannes Ocker, Haidi Zhou, Stefan Müller, OCKER JOHANNES, ZHOU HAIDI, MÜLLER STEFAN, Ocker, Johannes, Zhou, Haidi, Müller, Stefan
Принадлежит: FERROELECTRIC MEMORY GMBH, Ferroelectric Memory GmbH

According to various aspects, a memory cell arrangement is provided, the memory cell arrangement including a control circuit configured to carry out a de-trapping writing scheme to write at least one memory cell of the memory cell arrangement into a memory state, the de-trapping writing scheme including providing one or more write voltage pulses and one or more de-trapping voltage pulses at the at least one memory cell, wherein the one or more de-trapping voltage pulses have opposite polarity with respect to the one or more write voltage pulses, and wherein one or more properties of the one or more write voltage pulses and of the one or more de-trapping voltage pulses are varied as long as the memory cell is not in the memory state.

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Номер записи: 2
10-09-2014 дата публикации

Method for rapidly preparing polythiophene in mixed solvent system

Номер: CN104031244A
Автор: LIU YINFENG, ZHAO KAIKAI, FANG YUAN, LI CHENJUN, YANG XIAORUI, ZHOU HAIDI, YANG RUTING
Принадлежит:

The invention relates to a method for rapidly preparing polythiophene in a mixed solvent system. According to the method, a mixed solvent system is adopted as a polymerization reaction medium. One component in the mixed solvent is water in which neither thiophene monomer nor polythiophene can be dissolved and the other component is a good solvent for the thiophene monomer, and polythiophene can be dissolved in the good solvent to a certain extent, and the good solvent is miscible with water, and the oxidant and the catalyst system can be dissolved in the mixed solvent. The temperature in the method for preparing polythiophene is easily controlled, the process is simple, the product is efficiently processed, solvents are conveniently recycled, and the mixed solvent system and oxidation/catalytic system have wide selectable ranges and universal applicability.

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Номер записи: 3
04-03-2015 дата публикации

Polyamide/polypropylene alloy heat-conducting composite material and preparation method thereof

Номер: CN104387762A
Автор: LIU YINFENG, XU HUAGEN, ZHOU HAIDI, ZHANG YANG, WANG YUXIANG, ZHU YILI, MENG CHENGMING, CHEN XIAODONG
Принадлежит:

The invention relates to a polyamide/polypropylene alloy heat-conducting composite material and a preparation method thereof. The composite material comprises the following components in percentage by mass: 42-63 percent of PA, 7-28 percent of PP, 1-7 percent of a compatilizer, 0.2-0.5 percent of an antioxidant, 0.2-0.5 percent of a lubricating agent and 30 percent of heat-conducting filler. Disperse two phases are formed by utilizing polar polyamide and non-polar polypropylene, and a certain amount of compatilizer is added so that the two phases are partially compatible; and meanwhile, the filler is distributed between the interfaces of the two phases or distributed in one of the two phases by utilizing the viscosity difference between the two phases, so that a heat-conducting path is easily formed by the filler in the polymer alloy system. In addition, closer overlap joint is formed in a matrix by utilizing graphite packing with different particle sizes, so that the heat-conducting performance ...

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Номер записи: 4
26-02-2014 дата публикации

Heat-conducting, wear-resistant and insulated nylon 6 composite material and preparation method thereof

Номер: CN103602060A
Автор: LIU YINFENG, ZHOU HAIDI, ZHAO KAIKAI, FANG YUAN, YANG XIAORUI, LI CHENJUN, SHAO HONGJUAN, WANG YINJIE, MENG CHENGMING, CHEN XIAODONG
Принадлежит:

The invention relates to a heat-conducting, wear-resistant and insulated nylon 6 composite material and a preparation method thereof. The material is composed of the following raw materials in percentage by weight: 20-50% of PA 6, 10-30% of fibrous heat-conducting fillers, 15-30% of insulated heat-conducting powder A, 5-10% of insulated heat-conducting powder B, 5-15% of heat-conducting wear-resistant powder, 0.75-1.5% of coupling agent, 3-10% of compatibilizer, 0.2-0.5% of antioxidant and 0.2-0.5% of lubricant. According to the heat-conducting, wear-resistant and insulated nylon 6 composite material provided by the invention, heat-conducting fillers with different particle sizes, different shapes and different draw ratios are compounded so that the fillers are more uniformly distributed in a plastic matrix so as to form a heat-conducting network more easily. Since a low-feeding high-shearing extrusion process is used in the invention, an extruder is at a hungry state to achieve an effect ...

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Номер записи: 5
11-03-2015 дата публикации

Polyacrylic acid emulsion hydrophobic coating material with low fluorine content and preparation method thereof

Номер: CN104403471A
Автор: LIU YINFENG, FANG YUAN, ZHAO KAIKAI, WANG YUXIANG, ZHU YILI, LI CHENJUN, YANG XIAORUI, ZHOU HAIDI, YANG RUTING
Принадлежит:

The invention provides a polyacrylic acid emulsion hydrophobic coating material with low fluorine content and a preparation method thereof. The coating comprises 30-50 wt.% of core-shell structure fluorinated polyacrylate resin, 0.6-3 wt.% of an emulsifier and 47-69.4% of water. The preparation method uses a core-shell polymerization method to prepare acrylate emulsion with surface containing fluorine, and uses the transfer characteristic of the fluoride-containing group to prepare the hydrophobic coating through the control of film forming conditions. Control on film forming conditions mainly includes film-forming temperature, heating rate and film-forming agent. By controlling the film forming conditions, in the premise of low fluorine content, control of surface migration of fluorine can reduce the surface energy and improve the hydrophobicity of the coating surface. The method can effectively reduce the usage amount of the fluorine-containing monomer, reduce synthesis cost, save energy ...

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Номер записи: 6