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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 8. Отображено 8.
26-06-2014 дата публикации

METHOD FOR MANUFACTURING CEMENTED CARBIDE INCLUDING CARBON NANOTUBE, CEMENTED CARBIDE MANUFACTURED THEREBY, AND CEMENTED CARBIDE CUTTING TOOL INCLUDING CEMENTED CARBIDE

Номер: WO2014098370A1
Принадлежит:

The present invention relates to a method for manufacturing a cemented carbide including a carbon nanotube. Specifically, the present invention comprises the steps of: (a) forming a carbon nanotube-metal composite from a carbon nanotube and metal powder; (b) mixing hard-phase powder with the carbon nanotube-metal composite obtained in the step (a); (c) molding the powder mixture obtained in the step (b); and (d) sintering the molded body obtained in the step (c). According to the manufacturing method of the present invention, the cemented carbide having excellent hardness and toughness can be manufactured by minimizing a reaction between the carbon nanotube and a transition metal carbide included in the cemented carbide and maximizing a toughness increase effect according to an addition of the carbon nanotube, and the cemented carbide including the carbon nanotube manufactured by the manufacturing method can be used for a cutting tool, a mold, a wear-resistant member, a heat-resistant structure ...

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08-03-2018 дата публикации

METHOD FOR DOPING Bi-Te-BASED N-TYPE THERMOELECTRIC POWDER WITH COPPER AND COPPER-DOPED Bi-Te-BASED N-TYPE THERMOELECTRIC POWDER MANUFACTURED THEREBY

Номер: KR1020180024689A
Принадлежит:

The present invention relates to a method for doping Bi-Te-based n-type thermoelectric powder with copper and copper-doped Bi-Te-based n-type thermoelectric powder manufactured thereby, and more particularly, to a method for doping Bi-Te-based n-type thermoelectric powder with copper using a chemical method for improving thermoelectric performance and copper-doped Bi-Te-based n-type thermoelectric powder manufactured thereby. The method for doping Bi-Te-based n-type thermoelectric powder with copper according to the present invention improves the density of the thermoelectric powder by uniformly distributing the copper in the thermoelectric powder with the chemical method and increases the electrical conductivity and Seebeck coefficient of the thermoelectric powder by controlling thermal conductivity and improving electrical characteristics by the doped copper to consequently reduce the thermal conductivity, thereby improving the performance index of the thermoelectric powder. COPYRIGHT ...

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24-03-2017 дата публикации

METHOD OF RECOVERY OF TUNGSTEN COMPOUND FROM WASTE CEMENTED CARBIDE

Номер: KR1020170032906A
Принадлежит:

The present invention relates to a method of preparing tungsten trioxide, tungsten, and tungsten carbide powder wherein waste cemented carbide or oxide thereof including tungsten carbide is dissolved by mechanically milling the waste cemented carbide or the oxide in the presence of metal salt, and dissolving the insoluble material; acid is added to the solution to precipitate tungstic acid; and then tungsten trioxide, tungsten, and tungsten carbide powders are produced. According to a recollection method of the present invention, impurities such as various abrasion agents included in waste cemented carbide sludge is able to effectively be separated without a complicated process for grinding or disassembling scraps of waste cemented carbide with high strength. In addition, rare metal is able to be collected at a high collection rate by performing reaction by effectively dissolving the waste cemented carbide without a complicated and inconvenient reaction process. COPYRIGHT KIPO 2017 ...

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07-04-2023 дата публикации

텅스텐 필라멘트의 제조방법 및 이에 의하여 제조되는 텅스텐 필라멘트

Номер: KR20230047270A
Принадлежит:

... 본 발명의 목적은 특성 및 수명이 우수한 텅스텐 필라멘트의 제조방법을 제공하는데 있고, 또한 본 발명의 다른 목적은 이 방법으로 제조되는 특성과 수명이 우수한 텅스텐 필라멘트를 제공하는데 있다. 텅스텐산(H2WO4) 분말과 바륨 산화물, 칼슘 산화물 및 알루미늄 산화물을 포함하는 금속 산화물 분말을 혼합하여 혼합분말을 제조하는 단계; 혼합분말을 용매와 혼합하여 슬러리를 제조하는 단계; 슬러리를 분무 건조하여 과립을 제조하는 단계; 과립 중 텅스텐산을 선택적으로 환원시키는 단계; 및 텅스텐산이 선택적으로 환원된 과립을 성형 및 소결하여 소결체를 제조하는 단계;를 포함하는 텅스텐 필라멘트의 제조방법을 제공한다. 본 발명에 따르면, 폐 스크랩을 재활용할 수 있을 뿐만 아니라, 특성이 우수하고 수명이 긴 텅스텐 필라멘트를 제조할 수 있는 효과가 있다.

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27-11-2017 дата публикации

폐 초경합금으로부터 텅스텐 화합물의 회수방법

Номер: KR0101800784B1
Принадлежит: 한국기계연구원

... 본 발명은 텅스텐카바이드를 포함하는 폐 초경합금 또는 이의 산화물을 금속염의 존재 하에서 기계적 밀링하여 용해시키고, 불용성 물질을 제거한 다음, 얻어진 용액에 산을 가하여 텅스텐산을 침전시켜 분리함으로써 텅스텐산을 회수하고, 이로부터 삼산화텅스텐, 텅스텐 및 텅스텐카바이드 분말을 제조하는 방법에 관한 것이다. 본 발명에 따른 회수방법에 따르면, 고강도의 폐 초경합금 스크랩을 분쇄 또는 분해하는 복잡한 공정 없이, 폐 초경합금 슬러지에 포함되어 있는 각종 연마제 등의 이물질을 효과적으로 분리할 수 있으며, 고온 및 고압 등의 복잡하고 번거로운 반응 공정 없이, 폐 초경합금을 효과적으로 용해시켜 반응을 진행시킴으로써 우수한 회수율로 희유금속을 회수할 수 있다.

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25-08-2015 дата публикации

CEMENTED CARBIDE TOOL MANUFACTURED BY USING SHRINK-FITTING PROCESS, AND MANUFACTURING METHOD THEREOF

Номер: KR1020150096535A
Автор: HA, GOOK HYUN
Принадлежит:

A cemented carbide tool manufactured by using a shrink-fitting process and a manufacturing method thereof are disclosed. The cemented carbide tool manufactured by using a shrink-fitting process comprises: a shank portion (110) which is coupled to a processing machine and has a circular hollow (111); and a blade portion (120) which is coupled to the circular hollow (111) through a shrink-fitting process and cuts a workpiece, wherein the blade portion (120) has a cutting blade (121) for cutting the workpiece and a cutting groove (122) on one side, and has an inlet portion (125) coupled to the circular hollow (111) in the shank portion (110) on the other side. According to the cemented carbide tool manufactured by a shrink-fitting process and the manufacturing method thereof, a blade portion cutting a workpiece of tools manufactured by cemented carbide such as an end mill, a drill, and a cold and hot punch which rotate and operate with a workpiece fixed is formed of cemented carbide, a shank ...

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17-11-2015 дата публикации

Cemented carbide hardmetal tool manufactured using shrink-fitting and manufacturing mehtod of The Same

Номер: KR0101569679B1
Автор: 하국현
Принадлежит: 한국기계연구원

... 열박음 공정을 이용해 제조된 초경합금공구 및 이의 제조방법을 개시한다. 상기 열박음 공정을 이용해 제조된 초경합금공구는 가공기계에 결속되며, 원형 중공(111)을 갖는 생크부(110); 열박음 공정을 통해 상기 원형 중공(111)과 결속되며, 피가공물을 절삭하는 날부(120)를 포함하며, 상기 날부(120)는 일측에 피가공물을 절삭하기 위한 절삭날(121) 및 절삭홈(122)이 형성되며, 타측에 상기 생크부(110) 내의 원형 중공(111)과 결속되는 인입부(125)가 형성된 것을 특징으로 한다. 상기 본 발명에서 제시하는 열박음 공정을 이용해 제조된 초경합금공구 및 이의 제조 제조방법은 피가공물을 고정시킨 상태에서 공구가 회전 및 작용하는 엔드밀, 드릴, 냉간 및 열간펀치 등과 같은 초경합금으로 제조된 공구 중 피가공물을 절삭하는 날부는 초경합금으로 형성하고, 가공기계와 결속되는 생크부는 일반합금으로 형성함으로써, 초경합금공구 제조시에 초경합금의 재료비용을 절감 및 사용양을 줄일 수 있다는 이점을 갖는다. 또한, 본 발명의 실시 예에 따른 열박음 공정(shrink-fitting)을 이용해 제조된 초경합금공구는 날부와 생크부의 분리가 용이하여, 날부 마모시에 날부만 교체 후 재사용이 용이할 뿐만 아니라, 분리된 날부의 초경합금을 재활용하기 용이하다는 이점을 갖는다. 또한, 높은 비중을 가지는 초경합금이 기존의 초경합금공구에 비하여 적게 사용되어 공구의 무게를 줄일 수 있다는 이점을 갖는다.

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05-03-2018 дата публикации

MANUFACTURING METHOD OF POWDER OF METAL WITH HIGH MELTING POINT FOR THREE DIMENSIONAL PRINTING USING POWDER COMPLEXATION PROCESS AND THREE DIMENSIONAL PRINTING METHOD USING SAME

Номер: KR1020180021518A
Принадлежит:

The present invention relates to a manufacturing method of powder of a metal with a high melting point for three dimensional printing using a powder complexation process, and a three dimensional printing method using the same. According to the present invention, powder of a metal with a high melting point for three dimensional printing having a two-stage structure where fine primary metal nanoparticles exist in large particles can be effectively manufactured by using a powder complexation process of spraying a suspension including one or more types of metallic precursor salts or metal particles to form liquid droplets, then spray-drying and heat-treating or spray-pyrolyzing the liquid droplets to manufacture mixed granules, and sintering the manufactured mixed granules. The powder for three dimensional printing has a structure of granules including metal nanoparticles therein. Primary metal nanoparticles of a nanoparticle size are granularized as single powder to include the fine primary ...

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