Abstract:
L'invention se rapporte à un procédé de préparation d'une poudre d'un alliage à base d'uranium et de molybdène en phase γ métastable, qui comprend : a) la mise en contact d'au moins un premier réactif choisi parmi les oxydes d'uranium et leurs mélanges, les fluorures d'uranium et leurs mélanges, avec un deuxième réactif consistant en du molybdène et un troisième réactif consistant en un métal réducteur, les premier, deuxième et troisième réactifs se présentant sous une forme divisée; b) la réaction des réactifs à une température > à la température de fusion du troisième réactif et sous une atmosphère inerte, moyennant quoi cette réaction conduit à la formation de l'alliage comprenant de l'uranium et du molybdène sous la forme d'une poudre dont les particules sont recouvertes d'une couche d'oxyde ou de fluorure du métal réducteur; c) le refroidissement de la poudre ainsi formée à une vitesse au moins égale à 450°C/heure; et d) l'élimination de la couche d'oxyde ou de fluorure du métal réducteur qui recouvre les particules de la poudre de l'alliage comprenant de l'uranium et du molybdène. Elle se rapporte également à un procédé de fabrication d'un combustible nucléaire mettant en œuvre ce procédé. Applications : Fabrication de combustibles nucléaires, notamment pour MTR.
Abstract:
A noble metal nano colloid maker includes a consumable cartridge where noble metal wire is bonded; a cartridge holder part that enables attaching or detaching the cartridge and allows it to be connected to the high- voltage energy electrode part; a cartridge-moving part that moves the cartridge up and down; a disconnection-sensing part that detects whether the noble metal wire attached to the consumable cartridge electrode is disconnected; a high-voltage charging and discharging part that controls the charging and discharging of electric energy through a 2-step method relay switch and a surge killer designed to protect the circuit from the resulting surge and noise when underwater plasma occurs; and a water cup weight-sensing part that detects whether the water cup contains a fixed amount of water, thereby allowing the simple production of noble metal nano colloids at home.
Abstract:
The present invention concerns a method of preparing PM products by high velocity compaction of iron or iron-based powers having irregular powder particles.
Abstract:
The invention concerns a method of improving the properties of a hydrogen storage alloy powder for a negative electrode of a rechargeable nickel hydride battery. The method comprises the steps of hydriding a powdered alloy starting material, oxidising the obtained hydride alloy powder and washing the oxidised powder. The invention also concerns the obtained powder.
Abstract:
The invention concerns a process for producing low oxygen, essentially carbon free stainless steel powder, which comprises the steps of preparing molten steel which in addition to iron contains carbon and at least 10 % of chromium, adjusting the carbon content of the melt to a value which is decided by the expected oxygen content after water atomising; water-atomising the melt and annealing the as-atomised powder at a temperature of at least 1120 DEG C in a reducing atmosphere containing controlled amounts of water. The invention also concerns a water-atomised powder including 10 % by weight of chromium and having a carbon content between 0.2 and 0.7, preferably between 0.4 and 0.6 % by weight and an oxygen/carbon ratio of about 1 to 3 and at most 0.5 % of impurities, as well as the annealed powder obtained according to the process.
Abstract:
본 발명은 다음의 수단들을 구비한 원자력 금속 또는 금속 합금 입자의 제조 방법 및 장치에 관한 것이다: 용융에 의해 금속 또는 합금의 유체를 준비하기 위한 수단(4); 상기 금속 또는 합금의 유체를 용융 금속 또는 합금의 분사 형태로 제공하기 위한 수단(12); 원심 회전하고, 용융 금속 또는 금속 합금의 입자들을 분무하는 경화 유체를 구동하고, 상기 입자들을 급속히 경화하기 위한 수단(1-7); 상기 원자력 금속 또는 금속 합금을 불활성 가스 분위기에서 용융하기 위한 수단(16-19), 및 용융 금속 또는 금속 합금의 분사를 그것이 경화되기까지 불활성 가스 기낭에 포함되도록 하기 위한 수단. 원자력, 연료, 금속, 분무
Abstract:
Disclosed is an oxide-dispersed platinum material which can be stably used at high temperatures and has excellent weldability. Specifically disclosed is a platinum material reinforced with dispersed oxide wherein particles composed of an oxide of an additional metal are dispersed in a platinum or platinum alloy matrix. Such a platinum material is characterized in that the oxygen concentration in the material excluding oxygen bonded to the additional metal is not more than 100 ppm. The dispersed particles preferably have an average particle diameter of not more than 0.2 mum and an average interparticle distance of 0.01-2.7 mum. The concentration of the dispersed particles is preferably 0.01-0.5% by weight, and the oxidation ratio of the additional metal is preferably 50-100%.
Abstract in simplified Chinese:[本发明之中文摘要]
本发明系提供一种经济地制造纯度高、粉末形状和粒度皆均一的金属粉末。系以高电压‧高电流放电用电源、钛金属等的金属电极供给设备、具有钛等的金属电极和对极之高压放电设备、电极振动或折动设备,储水槽、水供给口、生成钛金属等的金属分散液的排出口和排出帮浦构成其设备,来分离、回收钛金属等金属分散液之金属粉末。