Abstract: In a manufacturing method of magnetic alloy powder including an alloy of Fe and Ni, a precursor made of powdered chloride expressed as FeCl2·2H2O·NiCl2·2H2O is prepared, and the precursor is reduced by heating with calcium hydride to form the, magnetic alloy powder having a coercivity of greater than or equal to 40 kA/m.

Abstract: A method of operation in an ethernet receiver circuit is disclosed. The method comprises sampling an input signal to generate a sampled signal having a sampled noise component and a sampled data component. The sampled signal is sliced, and a slicer error determined based on the slicing of the sampled signal. A subsequently sampled noise component is filtered based on the slicer error.

Abstract: A method and a device are described for the production of metal powder or alloy powder of a moderate grain sizes less than 10 ?m, comprising or containing at least one of the reactive metals zirconium, titanium, or hafnium, by metallothermic reduction of oxides or halogenides of the cited reactive metals with the aid of a reducing metal, wherein said metal powder or alloy powder is phlegmatized by adding a passivating gas or gas mixture during and/or after the reduction of the oxides or halogenides and/or is phlegmatized by adding a passivating solid before the reduction of the oxides or halogenides, wherein both said reduction and also said phlegmatization are performed in a single gas-tight reaction vessel which can be evacuated.

Abstract: The present invention relates to a method for manufacturing a Fe—Si alloy powder. A method for manufacturing a Fe—Si alloy powder includes: providing a mixture of an Al2O3 powder, an active agent powder, a Si powder, and a Fe powder; heating the mixture with a temperature of 700° C. to 1200° C. in the hydrogen atomosphere; magnetically separating a Fe-containing material from the mixture; and separating a Fe—Si alloy powder by soaking the Fe-containing material in an alkali solution. In the heating of the mixture, the Si powder is deposited on the surface of the Fe powder and diffused into the Fe powder.

Abstract: A magnetic powder of an Sm—Fe—N alloy, which has a mean particle diameter of 0.5 to 10 &mgr;m, and either an average acicularity of 75% or above or an average sphericity of 78% or above. The powder exhibits an extremely high residual magnetization and an extremely high coercive force, since particles characterized by the above acicularity or sphericity have particle diameters approximately equal to that of the single domain particle and nearly spherical particle shapes. The powder can be produced by preparing an Sm—Fe oxide by firing a coprecipitate corresponding to the oxide, mixing the obtained oxide with metallic calcium and subjecting the mixture to reduction/diffusion and nitriding successively.

Abstract: The present invention relates to a method of producing Nd—Fe—B based nanophase powder, or more particularly, to a method of producing Nd2Fe14B phase powder of 1 &mgr;m or less, having Nd2Fe14B crystal grains of 50 nm or less, which comprises the following steps of: producing a precursor powder having a mixture of elements of Nd, Fe and B by means of spray-drying a mixed aqueous solution comprising Nd metal salt, Fe metal salt, and boric acid; producing an oxide composite powder by means of desaltation of said powder; reducing the composite oxide powder, and ball-milling of said composite powder comprising Nd oxides and &agr;-Fe; producing a mixed powder of Nd2Fe14B/CaO phase by mixing Ca to said composite powder after milling; and removing CaO by washing said composite powder with water, followed by drying.

Abstract: A method of manufacturing niobium and/or tantalum powder consisting of: a first-stage reduction process of reducing niobium and/or tantalum oxides with alkali metals and/or alkaline-earth metals to obtain low-grade oxide powder represented by (NbTa) Ox, where x=0.06 to 0.35, a process of removing the oxide of alkali metals and/or alkaline-earth metals generated in the first-stage reduction process, and a second-stage reduction process of reducing the low-grade oxide powder obtained in the first-stage reduction process, with a melt solution of alkali metals and alkaline-earth metals to obtain niobium and/or tantalum powder.

Abstract: A rare earth-iron-boron magnetic powder comprising a rare earth element, iron and boron, which has a coercive force of 80 to 400 kA/m, a saturation magnetization of 10 to 25 &mgr;W/g, an average particle size of 5 to 200 nm, and a particulate or ellipsoidal particle shape, and a magnetic recording medium having a magnetic layer which contains this magnetic powder and a binder, in which magnetic recording medium it is possible to practically use a very thin magnetic layer of 0.3 &mgr;m or less.

Abstract: The present invention relates to the preparation of Nd--Fe--B permanent magnetic alloys and more particularly to a process of preparing Nd--Fe--B permanent magnetic alloys with neodymium, iron and boron as their basic constituents, wherein ammonium hydroxide (concentrated ammonia water) and ammonium carbonate are used as the precipitant, and neodymium salts, ferrous salts and soluble boron compounds as the starting materials for alloy elements such as neodymium, iron and boron, in addition, machining surplus or wastes of Nd--Fe--B alloys can also be used as raw materials so as to avoid the use of expensive rare earth metal. The process of the present invention comprises the steps of co-precipitation, hydrogen pre-reduction, calcium reduction-diffusion, rinsing, drying and powder manufacturing etc. and is capable of significantly reducing the costs compared with any of the existing processes.

Abstract: The disclosure describes spindle-shaped magnetic iron-based alloy particles containing cobalt and iron as the main ingredients in which the Co content is 1.0 to 50.0 atm % (calculated as Co) based on the total Fe in the spindle-shaped magnetic iron-based alloy particles, and which the spindle-shaped magnetic iron-based alloy particles have an average major axis diameter of 0.05 to 0.18 .mu.m, a size distribution (standard deviation/major axis diameter) of not more than 0.25, an average minor axis diameter of 0.010 to 0.020 .mu.m, an aspect ratio (major axis diameter/minor axis diameter) of 4 to 15, an X-ray crystallite size D.sub.110 of 120 to 180 .ANG., a coercive force of 1720 to 2500 Oe, a saturation magnetization of not less than 110 emu/g, and a saturation magnetization decrement percentage of not more than 17%.

Abstract: The quantity of impurities in a magnetic material is decreased to produce a magnetic material with good quality, and a decrease in the cost of the magnetic material is realized by desulfurization. A magnetic raw material for metallic thin film magnetic recording media which contains sulfur more than 20 ppm is desulfurized to obtain the magnetic material for metallic thin film magnetic recording media with the sulfur content adjusted to 20 ppm or below, and a metallic thin film magnetic recording medium having a magnetic layer vaporized thereon with the magnetic material is fabricated.

Abstract: Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.

Abstract: A method for preparing a barium-ferrite-coated, needle-shaped .gamma.-Fe.sub.2 O.sub.3 magnetic powder of better properties is provided. The method includes the following steps of a) letting an iron-containing solution undergo a reaction to precipitate a needle-shaped .alpha.-FeOOH phase powder, b) mixing said .alpha.-FeOOH powder into a barium-containing solution in a predetermined Fe/Ba ratio, c) filtering without washing the precipitated powder, and d) subjecting the precipitated powder to heat treatments including calcination, reduction and oxidation.

Abstract: A powder of a rare earth oxide, or a powder of a rare earth oxide and a rare earth metal is mixed with a powder containing iron, a powder containing boron and at least one material selected from among an alkali metal, an alkaline earth metal and a hydrogenated product thereof. The mixture is heated at a temperature of 900.degree. C. to 1200.degree. C. in a non-oxidizing atmosphere, subjected to wet treatment, and heated again at a temperature of 650.degree. C. to 1100.degree. C., whereby an alloy powder is obtained. Alternatively, the mixture is heated at a temperature of 900.degree. C. to 1200.degree. C., crushed into coarse particles, heated again at a temperature of 650.degree. C. to 1100.degree. C. and subjected to wet treatment. The powder is pulverized into a finer powder having an average particle diameter of 1 to 10 microns. The powder is used for making a magnet with a resin.

Abstract: Mixtures of a rare earth and an intermetallic compound comprising the rare earth and a ferromagnetic metal selected from the group consisting of iron and cobalt which are formed by the reduction-diffusion process are decalcified by washing with an aqueous ammoniacal solution comprising a reagent capable of forming a calcium salt soluble in alkaline solution and maintaining the pH of the washing solution above 9.0.