Abstract: A fiber is provided that has been thermally drawn from a fiber preform, having a longitudinal-axis length and including at least one core that has a longitudinal core axis parallel to the longitudinal axis and internally disposed to at least one outer fiber cladding material layer along the fiber length. The fiber is fed through a localized heating site having a heating site temperature, T, that is above a melting temperature of the fiber core, with a feed speed, ?f, that melts a portion of the fiber core at the heating site, causing molten droplets to pinch off of fiber core material, one droplet at a time, with a time period of molten droplet formation set by the fiber feed speed, ?f. The fiber is fed through the localized heating site to move the molten droplets out of the heating site and solidify the molten droplets into solid in-fiber particles.

Abstract: Described are thin plane-parallel aluminum flakes illustrated in FIG. 1 having a thickness of up to 200 nm and comprising an inner layer of oxidized aluminium having a thickness of 0.5-30 nm, a process for the manufacture thereof and the use thereof, e.g. in formulations, like paints, electrostatic coatings, printing inks, plastics materials, and cosmetics. Surprisingly, due to the inner layer of oxidized aluminum the aluminum flakes have an improved shear stability as evidenced e.g. by the difference in lightness before and after shear stress.

Abstract: A method for fabricating fine reduced iron powders comprises the following steps: heating fine iron oxide powders having a mean particle size of smaller than 20 ?m to a reduction temperature of over 700° C. to reduce the fine iron oxide powder into iron powders that are partially sintered into iron powder agglomerates; and performing a crushing-spheroidizing process on the iron powder agglomerates to obtain individual iron powders having a mean particle size of smaller than 20 ?m. The method can reduce iron oxide powers into iron powders having a rounded shape and a high packing density and a high tap density, which are suitable for the metal injection molding process and the inductor fabrication process. The reduced iron powder may further be processed using an annealing process and a second crushing-spheroidizing process in sequence to further increase the sphericity, packing density, and tap density of the reduced iron powder.

Abstract: The present invention is a metal paste for sealing comprising a metal powder and an organic solvent characterized in that the metal powder is one or more kinds of metal powders selected from a gold powder, a silver powder, a platinum powder and a palladium powder which has a purity of 99.9% by weight or more and an average particle size of 0.1 ?m to 1.0 ?m and that the metal powder is contained in a ratio of 85 to 93% by weight and the organic solvent is contained in a ratio of 5 to 15% by weight. This metal paste preferably contains an additive such as a surfactant in accordance with the application method. As a sealing method using this metal paste, there is a method of applying and drying a metal paste, sintering it at 80 to 300° C. to form a metal powder sintered body and after that pressurizing the base member and the cap member while heating the metal powder sintered body.

Abstract: There are disclosed a method of manufacturing fine metal powder and fine metal powder manufactured by using the same. The method of manufacturing fine metal powder includes forming a pattern having a predetermined size and shape on a base substrate, forming a metal film on the pattern, and separating the metal film from the pattern to obtain individual metal particles having a predetermined size and shape. The fine metal powder manufactured by the method has a uniform shape and a uniform particle size distribution. The fine metal powder is in the form of flakes, having a large ratio of particle diameter to thickness.

Abstract: A method for producing a decomposer of an organic halogenated compound comprises subjecting an iron powder produced beforehand to plastic deformation that gives the iron powder particles a flat shape. Further, an iron powder and a copper salt powder are mechanically mixed in a ball mill to produce a copper salt-containing iron particle powder in which the particles of the two powders are joined. In this case, the method for producing the decomposer of an organic halogenated compound is characterized in that the iron powder is mechanically deformed to give the particles a flat shape.

Abstract: A process for obtaining tantalum powder from tantalum containing scrap material is provided. The process includes selecting source material, such as from sintered anodes for capacitors, hydriding the source material, milling to desired particle size and surface area, dehydriding, deoxidizing, agglomerating, sifting, and acid treating to obtain tantalum powder of a desired size and purity.

Abstract: The present invention provides a bonding method in which a bonded portion having a sufficient bonding strength can be obtained at a relatively low temperature, for example, in die bonding a semiconductor chip. A metal paste 20 was applied to a semiconductor chip 10, the metal paste 20 consisting of metal powder of one or more kinds selected from gold powder, silver powder, platinum powder, and palladium powder having a purity not lower than 99.9 wt % and an average particle diameter of 0.005 ?m to 1.0 ?m and an organic solvent. After being applied, the metal paste 20 was dried in a vacuum in a dryer. The chip was heated at 230° C. for 30 minutes to sinter the metal paste, by which a metal powder sintered compact 21 was formed. Next, a nickel plate 30 was placed on the semiconductor chip 10, and bonded to the semiconductor chip 10 by heating and pressurization.

Abstract: A process for obtaining tantalum powder from tantalum containing scrap material is provided. The process includes selecting source material, such as from sintered anodes for capacitors, hydriding the source material, milling to desired particle size and surface area, dehydriding, deoxidizing, agglomerating, sifting, and acid treating to obtain tantalum powder of a desired size and purity.

Abstract: A process for preparing embossed fine particulate thin metal flakes having high levels of brightness and color intensity. The process comprises forming a release coat on a flexible polymeric carrier film, embossing the release coat with a diffraction grating pattern that is monoruled at an angle above 45°, vacuum metalizing the embossed release surface with a highly reflective metal such as aluminum, and solubilizing the metalized release coat in a solvent for removing the metal from the carrier to form embossed metal flakes that replicate the embossment pattern. The flakes are recovered from the solution containing the solvent and release coat polymer while avoiding high shear, particle sizing or other application of energy that would excessively break up the flakes, so that the D50 particle size of the flakes is maintained at or above 75 microns.

Abstract: A method for producing gear wheels from blanks obtained by sintering metal powders, comprising the step of coining longitudinal and transverse profiles of the teeth of a sintered blank with a rolling operation by one or more rollers shaped complementarily to the blank with a profile which is adapted to produce modifications of the profiles.

Abstract: The invention relates to a coating powder and method for its production. Said powder can be used in many technical fields, specially in machine and vehicle construction in chemical and petro-chemical installations. This coating powder has a hardmetal-like microstructure and consists of two cubic hard material phases, each of them representing a nucleus-external surface structure of a hard material particle. The hard material phase in the nucleus contains mostly Ti and C and the hard material phase in the external surface mostly Ti, a second metal and C, which are embedded in a binder phase containing at least one or more elements such as Ni, Co and Fe. According to the invention, said coating powder is characterized by the fact that no additional alloying element exists either in the hard material phase, in the binder phase or in both phases simultaneously.

Abstract: Finely divided embossed metal particles are prepared by forming an embossment on a carrier surface in which the embossment comprises a machine readable image produced by a diffraction grating pattern, a holographic image pattern or an image visible solely by optical magnification. A layer of metal is applied to the surface so the layer adopts the complement or the embossment. The layer is then separated from the surface and reduced to embossed particles. Alternatively, the embossment can be formed on the carrier sheet directly or on the outer surface of a release coating formed on the carrier sheet. When removing the film of metal from the release-coated carrier, the carrier sheet with the release coating and film of metal can be passed through a release environment which causes the release coating to separate the film and carrier, but which is nondestructive of the metal.

Abstract: A method of producing metal flakes by producing a highly porous sponge structure of the metal; comminuting the highly porous sponge structure into particles; and flattening the particles into flakes having a low porosity. The method is particularly useful for producing high-purity flakes of silver, including its alloys.

Abstract: A procedure for making zinc particles of a size, shape and composition such that the particles can be subsequently used in a process for manufacturing zinc parts from such particles in either molten or powder form includes the initial step of heating zinc to a temperature at least as high as 720.degree. C. The molten zinc is passed through a screen having small openings, on the order of about 1/4".times.1/4" into a cooling region formed by a movable surface which is at a temperature of on the order of about -200.degree. C. The zinc forms small particles as it passes through the openings in the screen and essentially instantaneously solidifies as it contacts the movable surface. Thereafter, the solidified zinc particles are subjected to a grinding process to reduce their size to a powder having a surface area in the range of 2 mm.sup.2 to 20 mm.sup.2.

Abstract: A method for manufacturing tantalum capacitors includes preparing a tantalum compact by cold pressing tantalum powder, placing the compact, along with loose refractory metal powder, in a microwave-transparent casket to form an assembly, and heating the assembly for a time sufficient to effect at least partial sintering of the compact and the product made by the method.

Abstract: Embossed, finely-divided, thin, bright-metal particles are prepared by forming an embossed release surface on at least one side of a carrier sheet in which the embossed pattern comprises a diffraction grating having from about 5,000 to 11,000 grooves per cm. A metal film is deposited on the release surface so that the metal film conforms to the embossed surface. The carrier sheet is passed with the release surface and the metal film through a release environment which causes the release surface to separate from the metal film. The metal film is removed from the release surface in a particulate form to produce metal particles substantially free of the release surface. The particles are collected in a solvent which is non-reactive with the metal. The metal particles are then broken into pigment particles having an average diameter between about 10 to about 50 microns. The film may also take the form of an optical stack.

Abstract: This invention provides a minute alloy powder with hard particles uniformly dispersed therein. The alloy powder may be used as a grinder material for finishing a specular surface or surfaces of other precision instruments or as a material for cladding and strengthening a surface of a parent material by welding the alloy powder. This alloy powder is manufactured by first blending metal or alloy particle powder having a particle diameter between 0.1.mu. and 300.mu., hard particle powder having a particle diameter between 0.1.mu. and 50.mu., and an organic binder. The resulting material mixture is granulated into granulated powder having a particle diameter between 300.mu. and 80,000.mu., and the powder is welded or dissolved with electric arc or plasma arc. The resulting welded bead or ingot is machined with a shaper into shavings, and the shavings are ground with a stamping mill into powder. The powder is classified such that the alloy powder having a particle diameter between 10.mu. and 10,000.mu.

Abstract: A method is disclosed for controlling a self-propagating reaction in a particulate medium. The method comprises controlling the boundary heat flux of the reaction to produce reaction waves which travel through the particulate medium undergoing a self-propagating reaction. The method provides a product having a unitary, solid structure with layers of alternating density. Preferably the reaction is a reaction between two metals to produce an intermetallic compound or between a metal and a non-metal to produce a ceramic compound. Nickel aluminide is a preferred intermetallic compound. Also disclosed is a controlled reactive sintering process for producing a finely divided intermetallic compound comprising comminuting the layered body of intermetallic compound.

Abstract: A the magnetically anisotropic magnetic powder having an average particle size of 1-1000 .mu.m and made from a magnetically anisotropic R-TM-B-Ga or R-TM-B-Ga-M alloy having an average crystal grain size of 0.01-0.5 .mu.m, wherein R represents one or more rare earth elements including Y, TM represents Fe which may be partially substituted by Co, B boron, Ga gallium, and M one or more elements selected from the group consisting of Nb, W, V, Ta, Mo, Si, Al, Zr, Hf, P, C and Zn. This is useful for anisotropic resin-bonded magnet with high magnetic properties.

Abstract: A process for producing magnetically anisotropic powder having "flattened" crystal grains of an R-TM-B-M system alloy with preferably (c)/(a) greater than 2, where (c) is the grain size perpendicular to the C-axis and (a) the grain size parallel to the C-axis, includes the steps of plastically deforming a green compact of flakes formed by rapidly-quenching the alloy melt, and then crushing the plastically deformed body. In the alloy system, R is at least one of the rare earth elements including Y, TM is Fe or Fe a part of which has been substituted with Co, B is boron, and M is an additive selected from Si, Al, Nb, Zr, P and C.

Abstract: A molten metal is placed in contact with a bed of moving beads. The molten metal breaks up into fine particles which are rapidly cooled in contact with the beads and consequently acquire a structure which is typical for such rapid cooling.

Abstract: A the magnetically anisotropic magnetic powder having an average particle size of 1—1000 &mgr;m and made from a magnetically anisotropic R-TM-B-Ga or R-TM-B-Ga-M alloy having an average crystal grain size of 0.01-0.5 &mgr;m, wherein R represents one or more rare earth elements including Y, TM represents Fe which may be partially substituted by Co, B boron, Ga gallium, and M one or more elements selected from the group consisting of Nb, W, V, Ta, Mo, Si, Al, Zr, Hf, P, C and Zn. This is useful for anisotropic resin-bonded magnet with high magnetic properties.