Electric heating – Metal heating – By arc
Patent
1990-09-26
1991-11-26
Albritton, C. L.
Electric heating
Metal heating
By arc
21912165, 21912176, B23K 2600
Patent
active
050685120
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for producing amorphous ceramic products or metal alloys by means of a high pressure autoclave in which firstly a preform of the sample is heated by means of laser beams up to melting temperature and is then rapidly cooled down.
Amorphous metal alloys, also called metal glasses, have been known for twenty years. They are constituted by a noncristalline body having an unsystematic structure which is obtained by cooling down a molten charge. The cooling is carried out at high speed (at about 10.sup.6 Ks.sup.-1) down to a temperature at which crystallization is no more possible.
Such amorphous substances show new mechanical, electrical and chemical characteristics which are not achieved by the corresponding crystallized variations.
The high cooling speed of the molten material is decisive for the production of such amorphous substances. Thus, a method is known in which the molten material flows from an inductively heated melting pot onto the periphery of a copper disk having a band scraper and rotating about a horizontal axis. It is also possible to introduce the molten material between two narrow copper disks rotating about horizontal axes or to bring it onto the disk surface of a copper disk rotating about its vertical axis.
It has also previously been proposed to maintain an electrically conductive molten material without container magnetically in suspension and to heat it up inductively in such a way that impurities from the melting pot cannot impair the alloy. In space tests, droplets of a non-conductive material without melting pot have also been heated up by means of laser beams. The droplets are held in space in a defined position by means of air nozzles.
From DE-A 20 32 577 a method is known per se for melting fireproof materials by means of at least two laser beams directed through windows in a process autoclave onto a preform, a method which is preferably carried out under gravity free space condtions.
Apart from the cost which is involved in the transfer of production of such alloys-into space, the problems of sample positioning and sample stability are not yet solved in a satisfactory manner. It is the aim of the invention to provide a device for producing amorphous substances which makes it possible to produce such amorphous substances, and even electrically non-conducting substances, at high purity within the gravity field of the earth. This aim is reached by the device as characterized in claim 1. As to preferred embodiments of the invention, reference ist made to the subclaims.
The invention will now be described by means of a preferred embodiment and the unique drawing which shows schematically and in perspective a device according to the invention.
The device contains as essential element an autoclave 1 of essentially cylindrical shape, in the central point of which is located the process position 2, i.e. the place where a spherical sample is to be heated and cooled. The sample originates from a sphere-feed device 3, which is axially mounted on the autoclave 1 and which holds at disposal a series of spheres or preforms with the composition of the desired alloy one after the other in view of the transfer to the process position 2. To this end, this device contains a step-by-step motor 4 and an individualization disk 5 driven by it, as well as a hollow shaft 6, through which a sphere released by a magazine 7 can drop into the process position 2. Opposite to the process position of the sphere feed device 2 a housing 8 is mounted on the autoclave 1, which housing contains a recipient 9 for collecting the finished samples as well as a lift motor 10 which carries via a spindle 11 an acoustic resonance-levitation installation 12. The latter is situated below the process position 2 and contains several electrically excitable piezoceramic disks.
Between the process position 2 and the levitation installation 12 there is further inserted an acoustically permeable catch basket 26, and above the process position there is provided a reflector disk 13, through the central
REFERENCES:
patent: 4606883 (1986-08-01), Wizemann et al.
patent: 4966737 (1990-10-01), Werner et al.
Hiernaut Jean-Pol
Magill Joseph
Van Geel Jacobus
Werner Paul
Albritton C. L.
European Atomic Energy Community
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