Abstract:
본 발명은 저산소, 저탄소 철계 분말을 제조하는 방법에 관한 것이다. 이러한 방법은 크롬, 망간, 구리, 니켈, 바나듐, 니오븀, 붕소, 규소, 몰리브덴, 및 텅스텐으로 구성된 그룹으로부터 선택된 하나 이상의 선택적인 합금 원소와 필수적인 철을 포함하는 분말을 준비하는 단계와, 적어도 H 2 및 H 2 O 가스를 함유하는 대기에서 상기 분말을 탈탄하는 단계와, 상기 탈탄 공정 동안 형성된 하나 이상의 탄소 산화물의 농도를 측정하는 단계와, 또는 노의 종방향으로 서로 소정의 거리만큼 떨어져 위치하는 둘 이상의 지점에서 산소 포텐셜을 측정하는 단계와, 상기 측정값의 도움으로 탈탄 대기에서 H 2 O 가스의 함유량을 조절하는 단계를 포함한다. 다른 선택적인 실시예에서는 산소 포텐셜의 측정과 관련하여 탄소 산화물을 측정하는 것을 포함한다.
Abstract:
The present invention concerns a powder metallurgical produced component and the manufacturing process thereof. In particular, the component is a belt pulley to be used in a combustion engine, the component having enhanced resistance against wear and sufficient strength. The production method utilise comparably non expensive powder materials and production steps, hence being cost effective.
Abstract:
A method for forming a thin SiO2 film on a magnetic material by which a thin SiO2 film is formed on a surface of a magnetic material including iron and silicon as main components, the method including: an Fe oxide removal process of removing Fe oxide present on the surface of the magnetic material by performing a reduction treatment with respect to the magnetic material; and an oxidation treatment process of forming a thin SiO2 film on the surface of the magnetic material by performing an oxidation treatment with respect to the magnetic material from which the Fe oxide has been removed in the Fe oxide removal process. An electric resistance value of the magnetic material can be increased and eddy current loss can be decreased.
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 µm and an average interparticle distance of 0.01-2.7 µm. 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:
A solid material for magnet containing a R-Fe-N-H type magnetic material as a primary component is produced by incorporating hydrogen into a rare earth element-iron-nitrogen type magnetic material powder having a rhombohedral or hexagonal crystal structure, preparing a green formed compact in a magnetic or non-magnetic field, and subjecting the green compact to a shock compaction by the use of an underwater shock wave while preventing the decomposition of a R-Fe-N-H type magnetic material by suppressing its residual temperature after the shock compaction to a temperature not higher than the decomposition temperature of the R-Fe-N-H material (ca. 600 DEG C at an ordinary pressure) through utilizing the characteristics of a shock compaction, such as ultra-high pressure shearing property, activating function and short time phenomenon.
Abstract:
A method for producing a metal structure comprising the following steps: providing a metal-coated polymer substrate; heating the metal-coated polymer substrate in a hot zone, in which a temperature of at least 600°C prevails and in which an atmosphere essentially composed of water vapor or of a mixture of water vapor and neutral gas is maintained, so as to remove the polymer substrate and form a metal structure; and cooling the metal structure in a cooling zone.
Abstract:
The invention concerns a method and a device for preparing nuclear metal or metal alloy particles comprising: means (4) for preparing by melting a fluid mass of the metal or of the alloy; means (12) for providing the fluid mass of the metal or of the metal alloy in the form of a jet of molten metal or metal alloy; means (1-7) for driving a hardening fluid in centrifugal rotation and in spraying particles of the jet of molten metal or metal alloy, and for rapidly hardening the particles; means (16-19) for melting the nuclear metal or the metal alloy under an atmosphere of inert gas, and means for enclosing the jet of molten metal or metal alloy with an inert gas envelope until it is hardened.