Apparatus for fabricating a foil
First Claim
1. Apparatus for fabricating a foil (6) from a ternary active brazing alloy containing at least one of titanium, zirconium, or nickel by melt spinning, the foil having a uniform thickness and two generally smooth surfaces, the apparatus comprising a cylindrical uncooled crucible (1) made of high-density graphite or of boron nitride, means or melting the alloy in the crucible, and means for forcing the melted alloy through an opening (3) in the bottom of the crucible onto a metal drum (5) of high thermal conductivity rotating at a high circumferential speed, on which the liquid alloy solidifies at a cooling rate of about of 103 to 106 °
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Accused Products
Abstract
This active brazing serves to braze ceramic parts or single crystals or metal parts or to braze ceramic parts to single crystals or ceramic parts or single crystals to metal parts. In addition to the zirconium-nickel alloy, which is composed of 70 atom % to 85 atom % zirconium and 15 atom % to 30 atom % nickel, it contains titanium. In an apparatus for fabricating a foil (6) from this ternary active-brazing alloy by melt spinning which has a uniform thickness and two surfaces that are as smooth as possible, the alloy, after being melted by high-frequency heating in a cylindrical crucible (1) made completely of a high-temperature-resistant and highly thermally conductive nonmetallic material, particularly of high-density graphite or of boron nitride, is forced through an opening (3) in the bottom of the crucible onto a metal drum (5) of high thermal conductivity rotating at a high circumferential speed, on which the liquid alloy solidifies at a cooling rate on the order of 103 to 106 ° C./s. A product made using this ternary active brazing is a pressure sensor (10) having a substrate (12) and a diaphragm (11) of ceramic, particularly alumina ceramic, preferably with a purity of 96 wt.%, which are thermally joined around the periphery in a defined spaced relationship (d) and parallel to each other by means of the active brazing, e.g., by means of a preform (20) made therefrom, thus forming a chamber (13).
28 Citations
15 Claims
- 1. Apparatus for fabricating a foil (6) from a ternary active brazing alloy containing at least one of titanium, zirconium, or nickel by melt spinning, the foil having a uniform thickness and two generally smooth surfaces, the apparatus comprising a cylindrical uncooled crucible (1) made of high-density graphite or of boron nitride, means or melting the alloy in the crucible, and means for forcing the melted alloy through an opening (3) in the bottom of the crucible onto a metal drum (5) of high thermal conductivity rotating at a high circumferential speed, on which the liquid alloy solidifies at a cooling rate of about of 103 to 106 °
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7. An apparatus for fabricating a foil having a substantially uniform thickness from a brazing alloy containing at least one of titanium, zirconium, or nickel, the apparatus consisting essentially of:
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a drum having a high thermal conductivity; means for rotating the drum; an uncooled crucible made from a high-density graphite material or from a boron nitride material for holding molten brazing alloy therein, the crucible being formed to include an opening for discharging the molten brazing alloy from the crucible and onto the drum; means for heating the crucible to melt the brazing alloy in the crucible; and means for cooling the drum so that the molten brazing alloy solidifies on the drum at a cooling rate of 103 to 106 °
C./s. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification