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Title: Perforated plates for cryogenic regenerators and method of fabrication

Perforated plates (10) having very small holes (14) with a uniform diameter throughout the plate thickness are prepared by a "wire drawing" process in which a billet of sacrificial metal is disposed in an extrusion can of the plate metal, and the can is extruded and restacked repeatedly, converting the billet to a wire of the desired hole diameter. At final size, the rod is then sliced into wafers, and the wires are removed by selective etching. This process is useful for plate metals of interest for high performance regenerator applications, in particular, copper, niobium, molybdenum, erbium, and other rare earth metals. Er.sub.3 Ni, which has uniquely favorable thermophysical properties for such applications, may be incorporated in regions of the plates by providing extrusion cans (20) containing erbium and nickel metals in a stacked array (53) with extrusion cans of the plate metal, which may be copper. The array is heated to convert the erbium and nickel metals to Er.sub.3 Ni. Perforated plates having two sizes of perforations (38, 42), one of which is small enough for storage of helium, are also disclosed.
Inventors:
 [1]
  1. (Huntsville, AL)
Issue Date:
OSTI Identifier:
869213
Assignee:
Alabama Cryogenic Engineering, Inc. (Huntsville, AL) ORO
Patent Number(s):
US 5298337
Contract Number:
FG05-90ER81018
Research Org:
Alabama Cryogenic Engineering, Inc., Huntsville, AL
Country of Publication:
United States
Language:
English
Subject:
perforated; plates; cryogenic; regenerators; method; fabrication; 10; holes; 14; uniform; diameter; throughout; plate; thickness; prepared; wire; drawing; process; billet; sacrificial; metal; disposed; extrusion; extruded; restacked; repeatedly; converting; desired; final; size; rod; sliced; wafers; wires; removed; selective; etching; useful; metals; performance; regenerator; applications; particular; copper; niobium; molybdenum; erbium; rare; earth; uniquely; favorable; thermophysical; properties; incorporated; regions; providing; cans; 20; containing; nickel; stacked; array; 53; heated; convert; sizes; perforations; 38; 42; storage; helium; disclosed; selective etching; sacrificial metal; physical properties; rare earth; earth metal; earth metals; uniform diameter; nickel metal; stacked array; perforated plates; selective etch; final size; perforated plate; /428/29/