Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1993-11-23
1995-12-26
Bradley, P. Austin
Metal founding
Process
Shaping liquid metal against a forming surface
164462, 164423, B22D 1100
Patent
active
054779103
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process and device making it possible to obtain wires made of amorphous metal alloys by rapid cooling in a liquid medium, these alloys having an iron base.
It is known to make use of a process of hyperquenching by directing a jet of iron-based, amorphizable molten alloy into a liquid cooling layer, for example a layer of water, held by virtue of centrifugal force against the inner wall of a rotary drum. This process is commonly called "in rotating water spinning" (spinning into water in rotation), although it is not restricted to the use of water as cooling fluid, the latter process being often referred to by the abbreviation "INROWASP", a term which will be employed herein, given its very frequent use in technical literature.
The INROWASP process makes it possible to obtain amorphous fine wires, highly resistant to corrosion, which have a tensile breaking load that can reach or even exceed 3200 MPa.
Such a process is described, for example, in U.S. Pat. Nos. 4,495,691, 4,523,626, and 5,392,838.
However, at present this process exhibits the following disadvantages: place, this being even after only a few minutes pouring; quenched wire during the pouring, it is preferable to have a low value of the angle of incidence of the jet in relation to the circumferential direction of the cooling liquid, this value being, for example, between 40.degree. and 70.degree. ; droplets before its contact with the cooling liquid, it is necessary for the distance between this liquid and the die orifice to be very small, for example equal to 5 mm, or even less; bulkiness of the devices used to heat the alloy and to spin it; the moment it leaves the die; this oxidation results in considerable wetting of the outer part of the die by the oxide formed, giving rise to perturbations in the flow and, consequently, frequent breaks of the jet and of the wire, this being even with a short distance between the die exit and the cooling liquid; have a short distance between the pouring orifice and the cooling liquid, mean that it is very difficult to heat the liquid metal efficiently at the pouring orifice; it is then necessary to bring about an overheating of the liquid alloy, before it passes through the die, in order that it may remain liquid when discharged, but this overheating can cause hydrodynamic instabilities of the jet and can result in a poor surface quality of the wire obtained after quenching, or even a wire which is more sensitive to thermal embrittlement.
Japanese patent application published under No. 63-10044 describes a process in which an inert or slightly reducing protective gas is delivered into an enclosure surrounding the pouring crucible. However, this protective enclosure results in a considerable bulkiness which does not allow the pouring orifice to be heated efficiently, and the overheating of the amorphizable alloy cannot therefore be avoided. Furthermore, the protective gas is not localized at the pouring orifice and the protection of the jet is therefore not satisfactory.
Japanese patent application published under No. 1-271040 describes a process in which the heating of the amorphizable alloy in the top part of the crucible is produced with the aid of a first induction coil powered with an intermediate frequency current, and the heating at the bottom of the crucible is ensured by a second induction coil powered by a high frequency current. This device is characterized by a great complexity of the heating means, the proximity of the two induction circuits at different frequencies also being capable of giving rise to undesirable effects where the generators are concerned, as a result of the phenomenon of the coupling between the two circuits.
SUMMARY OF THE INVENTION
The aim of the invention is to avoid these disadvantages.
The invention consequently relates to a process for producing a wire made of amorphous metal alloy having an iron base, this process consisting in producing a jet of a molten amorphizable alloy through the orifice of a die and in in
REFERENCES:
patent: 4473401 (1984-09-01), Masumoto et al.
patent: 4495691 (1985-01-01), Masumoto et al.
patent: 4506023 (1985-03-01), Guigonis
patent: 4523626 (1985-06-01), Masumoto et al.
patent: 4566525 (1986-01-01), Li et al.
patent: 4573520 (1986-03-01), Fournier et al.
patent: 4614221 (1986-09-01), Masumoto et al.
patent: 4741464 (1988-05-01), Pinkerton
Dissertation an der FakultaT FuR Bergbau, Huttenwesen und Geowissenschaften er Rwth-Aachen, Dec. 1985, W. K. Hug: "Keimbildung und Kristallisation in rasch erstarrten, Eisen-Bor-Basislegierungen"* p. 17, FIG. 4.2*.
Bijaoui Denis
Jarrige Guy
Legras Michel
Roche Jean
Bradley P. Austin
Compagnie Generale des Etablissements Michelin - Michelin & Cie
Lin I.-H.
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