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Title: Perforated plates for cryogenic regenerators and method of fabrication

Abstract

Perforated plates having very small holes with a uniform diameter throughout the plate thickness are prepared by a [open quotes]wire drawing[close quotes] 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 containing erbium and nickel metals in a stacked array 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, one of which is small enough for storage of helium, are also disclosed. 10 figures.

Inventors:
Issue Date:
OSTI Identifier:
5017795
Patent Number(s):
5298337 A
Application Number:
PPN: US 7-800220
Assignee:
Alabama Cryogenic Engineering, Inc., Huntsville, AL (United States) PTO; EDB-94-077871
DOE Contract Number:  
FG05-90ER81018
Resource Type:
Patent
Resource Relation:
Patent File Date: 27 Nov 1991
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; PLATES; FABRICATION; REGENERATORS; DESIGN; CRYOGENICS; ERBIUM ALLOYS; HELIUM; NICKEL ALLOYS; ALLOYS; ELEMENTS; FLUIDS; GASES; NONMETALS; RARE EARTH ALLOYS; RARE GASES; 661210* - Cryogenics- (1992-)

Citation Formats

Hendricks, J.B. Perforated plates for cryogenic regenerators and method of fabrication. United States: N. p., 1994. Web.
Hendricks, J.B. Perforated plates for cryogenic regenerators and method of fabrication. United States.
Hendricks, J.B. Tue . "Perforated plates for cryogenic regenerators and method of fabrication". United States.
@article{osti_5017795,
title = {Perforated plates for cryogenic regenerators and method of fabrication},
author = {Hendricks, J.B.},
abstractNote = {Perforated plates having very small holes with a uniform diameter throughout the plate thickness are prepared by a [open quotes]wire drawing[close quotes] 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 containing erbium and nickel metals in a stacked array 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, one of which is small enough for storage of helium, are also disclosed. 10 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}