摘要:
A method of rapidly solidifying thin metallic strips, comprising projecting a jet of molten metal or alloy under reduced atmospheric pressure onto a cold substrate moving at high speed, thereby forming the strip in contact with the substrate, and then bringing the strip rapidly into higher atmospheric pressure. Forming the strip on the substrate under reduced atmospheric pressure improves the quality of the edges and surface of the strip, while bringing the strip rapidly into higher atmospheric pressure improves the adherence of the strip to the substrate. If the strip is brought into higher atmospheric pressure before its temperature falls to the temperature of vitrification, the properties of the vitreous metal formed, including its ductility, are also improved, because of the more rapid passage through the temperature range above the vitrification temperature than if the metal were cooled under reduced pressure.
摘要:
A thin strip of metal or alloy is subjected to rapid solidification as it is ejected under pressure in a molten state from a crucible onto a cold, continuous band moving at high speed beneath the crucible's opening, in order to form metal strips in the vitreous state. An atmosphere under reduced pressure surrounding the zone of impact of the molten metal on the band is provided by a partially evacuated housing having opposed narrow inlet and outlet openings through which the band passes. The band is cooled and precisely positioned, and its vibration is minimized, by ejecting fluid from openings in the bottom of the housing, over which the band passes in closely parallel fashion. A pressurized gas at low temperature, ejected through these openings in the direction of the band, creates a fluid cushion between the band and the bottom of the housing. Curved fluid-ejecting units acting analogously to pulleys may be provided to define the path of the continuous band and to form similar fluid cushions between the band and themselves. The metal may advantageously be brought out of the housing by the moving band into an atmosphere of higher pressure before its temperature reaches the temperature of vitrification of the metal.
摘要:
The invention relates to techniques for surface deionization of glass under the effect of a corona discharge. The invention consists of treating the object which is movable in relation to the electrodes situated at a short distance from said object which is brought to a high temperature. The treatment is carried out under a continuous current which is regulated in intensity. The treatment is accordance with the invention is preferably applied to sheets of glass during their production.
摘要:
An apparatus for rapidly quenching a metal or alloy in the molten state by projecting a jet thereof from a crucible 7 onto a cooled belt 1 moving at high speed inside a vacuum chamber 3. The crucible is mounted outside of and above the chamber, with its curved bottom, provided with a casting orifice 14, resting on the rim 5' of an opening provided in the upper cover 6 of the chamber.