Ternary active brazing based on a zirconium-nickel alloy

Details Ternary active brazing based on a zirconium-nickel alloy Ternary active brazing based on a zirconium-nickel alloy

C - Chemistry, Metallurgy

22

C

C22C 16/00 (2006.01) B22D 11/06 (2006.01) B23K 35/02 (2006.01) B23K 35/32 (2006.01) G01L 7/08 (2006.01)

Patent

CA 2054784

This active brazing preferably serves to braze (join) ((aluminum-)oxide-)ceramic parts or single cry- stals or metal parts or to braze (join) ((aluminum-) oxide-)ceramic parts to single crystals or ((aluminum-) oxide-)ceramic parts or single crystals to metal parts. In addition to the zirconium-nickel alloy, which is com- posed 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 open- ing (3) in the bottom of the crucible onto a metal drum (5) of high thermal conductivity rotating at a high cir- cumferential 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 dia- phragm (11) of ceramic, particularly alumina ceramic, preferably with a purity of 96 wt.%, which are ther- mally 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).

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