Abstract:
A process for adjusting the level of water or water soluble additives in aqueous-based powder injection molding compounds for the purpose of recycling scrap material, controlling shrinkage or rehydrating dry feedstock. Depending on the objective, the process may require material granulation equipment, equipment for the addition or removal of water and mixing equipment. The molding compounds may be comprised of either recycled scrap material before being heat-treated or dry, virgin feedstock material.
Abstract:
The invention concerns a process for producing a low-oxygen, low-carbon iron-based powder. The process comprises the steps of preparing a powder essentially consisting of iron and optionally at least one alloying element selected from the group consisting of chromium, manganese, copper, nickel, vanadium, niobium, boron, silicon, molybdenum, tungsten, decarburizing the powder in an atmosphere containing at least H2 and H2O gases, measuring the concentration of at least one of the carbon oxides (alternatively gases) formed during the decarburisation process, or measuring the oxygen potential in at least 2 points located at a predetermined distance from each other in the longitudinal direction of the furnace, adjusting the content of the H2O-gas in the decarburising atmosphere with the aid of the measurement. Another alternative concerns measuring the carbon oxides in combination with measuring the oxygen potential.
Abstract:
A porous metallic body that has a three-dimensional reticular skeleton structure wholly constituted of a powdery metallic sinter with a porosity of 10-60 % and that has a total porosity of 80-99 %. The specific surface are thereof is as large as, for example, 300-11,000 cm /cm . This body can be reinforced with reinforcing plates and is suitable as an electrode of an alkaline secondary battery capable of attaining a long service life and a large capacity of active materials which can be contained. The metallic body is produced by molding a foamable slurry containing a metallic powder, drying the molded slurry preferably after foaming, and sintering the same.
Abstract translation:具有三维网状骨架结构的多孔金属体,其全部由孔隙率为10〜60%,总孔隙率为80-99%的粉状金属烧结体构成。 其比表面积例如为300〜1100cm 2 / cm 3。 该本体可以用加强板加固,并且适合作为能够实现长期使用寿命的碱性二次电池的电极和能够容纳的大量的活性物质。 通过模制含有金属粉末的可发泡浆料,优选在发泡后干燥模塑浆料并烧结金属体来制造金属体。
Abstract:
PROBLEM TO BE SOLVED: To provide stainless steel powder which has improved compressibility based on water-atomized stainless steel powder, and to provide a process for producing the powder. SOLUTION: 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-atomized powder at a temperature of at least 1,120°C in a reducing atmosphere containing controlled amounts of water. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of manufacturing a sintered body wherein soft magnetic powder whose principal component is inexpensive iron is used for a raw material and the surface of the soft magnetic powder has a tight and strong high electric resistance layer with simple processes. SOLUTION: Fe-Si alloy powder is heated in a weakly acidic environment to form an SiO 2 oxide film on the surface, the powder is press-formed, and sintered in the weakly acidic environment to obtain the sintered body. A thin oxide film with high electric resistance and the Si of which is selectively oxidized is formed by executing a surface oxidation process in the weakly acidic environment using water vapor, and the powder is furthermore sintered in the weakly acidic environment to permit sintering while repairing the oxide film wherein cracks or the like are caused during press forming. COPYRIGHT: (C)2006,JPO&NCIPI