Metallurgical apparatus – Process
Patent
1993-01-12
1995-01-24
Kastler, Scott
Metallurgical apparatus
Process
266219, 266216, B22D 2300
Patent
active
053836499
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an introducing means for introducing powder or like particulate material into a molten metal, metal alloy or molten ceramic stream, or into a spray of molten droplets formed therefrom.
In our prior European Patent No. 198613, we have disclosed the introduction of solid particulate material, preferably into the `atomizing zone` either just before or immediately after a stream of molten metal or metal alloy begins to break up into a spray. The solid particles may be introduced with and carried by the atomizing gas, or may be carried by a separate flow of gas, or gravity fed or vibration fed into the atomizing zone. If fine particles are to be introduced then the powder material may be fluidized to prevent clogging.
An object of the present invention is to provide an improved introducing means.
According to the present invention, there is provided an introducing means for introducing particulate material into a molten metal, molten alloy or molten ceramic stream, or spray of droplets formed therefrom, the introducing means comprising an introducing chamber having an opening through which a stream of molten metal, metal alloy or molten ceramic may be teemed, an inlet for particulate material to the introducing chamber and outlet means positioned about the opening for allowing particulate material to exit from the introducing chamber at a plurality of positions about the opening so that, in use, the particulate material is introduced substantially uniformly about the stream or spray.
Preferably, the introducing chamber is annular and the inlet opens tangentially into the introducing chamber. Suitably there are two inlets both opening tangentially into the introducing chamber, one disposed diametrically opposed to the other.
Particulate material may be either supplied by recycling overspray from the atomizing chamber as disclosed and claimed in our European Patent No. 198613, or may be supplied from a separate source. Preferably the source comprises a hopper for powder, a screw feeder for feeding powder from the hopper to a mixing chamber, means for introducing transport gas at the mixing chamber, and at least one transportation conduit from the mixing chamber to the inlet to the introducing chamber. In the described arrangement the source also includes means for maintaining an equal pressure in the hopper and the mixing chamber.
The invention also includes introducing means, for introducing particulate material into a stream or spray of molten metal, metal alloy or molten ceramic, comprising a hopper for particulate material, a screw feeder for feeding particulate material from the hopper to a mixing chamber, means for introducing transport gas at the mixing chamber, at least one transportation conduit from the mixing chamber for conducting transport gas and particulate material to an outlet at which the particulate material may be applied into a stream or spray for incorporation therein.
Suitably the outlet is an outlet from an annular introducing chamber, an inlet of which opens tangentially into the chamber. The annular introducing chamber preferably has a plurality of outlets from the chamber so that particulate material may be introduced substantially uniformly into a metal stream passed through the opening defined by the annular introducing chamber.
The invention also includes a method of introducing particulate material into a stream or spray of molten metal, metal alloy or molten ceramic comprising the steps of:
providing particulate material within a hopper, screw feeding particulate material from the hopper to a mixing chamber,
mixing the particulate material at the mixing chamber with a transport gas,
transporting the particulate material to an introducing chamber positioned about the stream or spray, and,
causing the particulate material to issue from the introducing chamber substantially uniformly about the stream or spray so as to be incorporated therein.
The present invention has the advantage over fluidization methods in that the particulate flow rate governed by the sc
REFERENCES:
patent: 3831857 (1974-08-01), Scott
patent: 3951577 (1976-04-01), Okayama et al.
patent: 4066117 (1978-01-01), Clark et al.
patent: 4723763 (1988-02-01), Defrancq et al.
patent: 4901784 (1990-02-01), Ashok et al.
Kastler Scott
Osprey Metals Limited
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