Cold Finger For Cryocoolers

摘要

Method for fabricating a cold finger for attachment to a base assembly of a cold head of a Stirling cycle or pulse tube cryocooler. The exterior of a titanium alloy workpiece is machined to form a cylindrical outer surface. The exterior surface of the titanium workpiece is nickel plated and then brazed to a stainless steel workpiece to form an integral body. The brazed stainless steel workpiece is machined to form it into an adapter ring for attachment to the base assembly. An intermediate segment of the titanium workpiece is machined into a cylindrical surface including removing all of the nickel plating from the intermediate segment and removing a portion of underlying titanium alloy to reduce the diameter of the titanium alloy workpiece in order to reduce the thickness of the cold finger wall. The interior of the integral body is machined to form a cylindrical interior surface.

主权项

1. A method for fabricating a cold finger for attachment to a base assembly of a cold head of a Stirling cycle or pulse tube cryocooler, the base assembly including a casing, the method comprising:
(a) machining the exterior surface of a titanium alloy workpiece to form a cylindrical outer surface on the titanium workpiece; (b) nickel plating at least an end portion of the exterior surface of the titanium workpiece; (c) brazing the nickel plated end of the titanium workpiece to a stainless steel workpiece; (d) machining the brazed stainless steel workpiece to form it into an adapter ring for attachment to the base assembly.