摘要:
A molten metal spray-depositing apparatus employs a magnetic field-generating nozzle for atomizing a molten metal stream into a spray of metal particles. The magnetic driving field generated by the magnetic atomizing nozzle generates eddy currents which produce an induced field in the metal stream opposing the driving field and creating a torque which causes the stream to break up upon exiting the driving field. The nozzle has one of two configurations for generating one of two generic magnetic field geometries. In one configuration the nozzle utilizes a pair of spaced magnetic poles, such as provided by Helmholtz coils, for generating a transverse magnetic field geometry across the stream. In the other configuration the nozzle employs a solenoid coil for generating a solenoidal magnetic field geometry parallel to the stream. Preferably, the magnetic field of each geometry is a high frequency AC field since better coupling between the field and stream occurs and more eddy currents are induced at higher frequency.
摘要:
A method and apparatus for producing particulate directly from a supply of molten material by the use of a rotating member having discrete serrations in the periphery thereof. The leading surfaces of the serrations contact the molten material and propel a portion into a cavity formed by the surfaces of the serration while under the effect of a surface of a dam means, in proximity to which the serrations pass. The dam means is immersed in the supply of molten material adjacent to the periphery of the rotating member.
摘要:
In a solder paste which is a mixture of a flux and low melting point metal particles, low melting point metal fine particles manufactured by a conventional method or apparatus therefor include particles having widely varying particle diameters. Accordingly, the solder paste could not completely fill the minute holes in a mask for application to minute solder portions by printing, or mask removability was poor. According to the present invention, a mixture of a heat resistant continuous phase liquid and coarse metal particles in molten state is passed through a porous membrane to form the coarse low melting point metal particles into fine particles with a predetermined diameter. An apparatus according to the present invention comprise a porous membrane between a heating and dispersing mechanism and a cooling mechanism, and a pressure vessel connected to the heating and dispersing mechanism for applying a high pressure to the heating and dispersing mechanism.
摘要:
A manufacturing method of minute metallic spheres of the present invention comprises a heating means for heating and melting a metal to form a metallic sphere, a measurement means for measuring the injected molten metal into a predetermined volume, and a cooling means for cooling the molten metal discharged from the measurement means, to a temperature less than the melting point. The measurement means has a gauger of a predetermined volume in which the molten metal is injected, and is constructed such that the molten metal is cut by rubbing by the predetermined volume by sliding this gauger in contact. The molten metal is injected in the gauger of the predetermined volume to measure, and the measured molten metal is discharged from the gauger to cool to a temperature less than the melting point, and solidified into a sphere in the cooling process.
摘要:
Numerous products can be formed by combining a low melting matrix made up of one or more metals and high melting, high density metal particles and wherein the products can be formed by adding the high density particles to a molten matrix metal and casting same, mixing powders of all the metals together, compacting and sintering at a temperature in the low end of the melting range of the matrix alloy, or by mixing the high density particles into a paste of the matrix alloy and molding. These methods and compositions are particularly adaptable for use in forming low or non-toxic high density projectiles, such as, shot, bullets and pellets having a density comparable to that of lead while avoiding problems of toxicity associated with the use of lead.
摘要:
A method of producing coated powder material is provided. In the method, molten metal or metal alloy is caused to fall in a stream (3) and is then atomized into a spray. A liquid or solid material of different composition is introduced and caused to contact the stream or spray so that a coating is formed over all or part of the surface of the atomized droplets. The coating may be the introduced material or a reaction product.
摘要:
A gas-atomizing system for spray casting a spray of molten metal on a moving substrate in which the gas atomizing device is in the form of an annulus having a central opening therethrough through which the molten metal to be atomized flows. The annulus is provided with a plenum chamber which communicates with elongated openings on the bottom surface of the annulus. The manifold and outlets are so arranged that a divergent conical spray pattern is produced having a central axis inclined with respect to the vertical axis of the molten metal stream in a direction downstream of the moving substrate upon which the spray material is deposited.
摘要:
The process comprises at least a first phase for separating a plurality of particles of molten steel from a bath of molten steel, a second phase for subjecting these particles, while still in the fluid state, to a first system of forces acting on the outer surface of each of the said particles and to a second system of forces acting on each element of the body of each particle, the said two systems of forces being chosen in such a way that these forces tend to impart a substantially spherical form to each of the said particles, and a third phase for removing heat from the said particles sufficient to bring them substantially to the solid state.
摘要:
PLATE. IN ONE PREFERRED EMBODIMENT, A STEADY STREAM IS SEGMENTALLY CUT BY A VIBRATING WIRE OR SCREEN TO PRODUCE DROPS PRIOR TO CONTACTING THE WATER BATH OR PLATE.
THIS INVENTION COMPRISES METHODS FOR PRODUCING SHAPED ALUMINUM ALLOY PARTICLES. THESE PARTICLES CAN RANGE FROM 1-99 PERCENT ALUMINUM, ALTHOUGH FOR SUBSEQUENT USE AS ACTIVE METAL CATALYSTS, THE CONCENTRATION RANGES FROM 50 TO 90 PERCENT ALUMINUM AND 10 TO 50 PERCENT OF NICKEL, COBALT, COPPER OR IRON. THESE SHAPED PARTICLES ARE PRODUCED BY A MELT DROP TECHNIQUE WHEREBY INDIVIDUAL DROPS OF ALLOY ARE DROPPED INTO A WATER BATH OR ONTO A COLD FLAT