Method of making a multifilamentary super-conducting article
First Claim
1. A method for manufacturing a multifilamentary superconducting ceramic composite article comprising the steps of:
- providing a precursor article comprising a plurality of filaments extending along the length of the article and containing precursors to a desired superconducting ceramic, and a metal matrix substantially surrounding each filament;
roll working the precursor article during a breakdown stage at a predetermined pressure and a coefficient of friction less than about 0.2 during each roll working draft, and sintering the rolled article to obtain the desired superconducting ceramic.
1 Assignment
0 Petitions
Accused Products
Abstract
A reduced coefficient of friction, preferably created by ideal lubrication conditions, may advantageously be employed in the breakdown deformation of a precursor to a multifilamentary superconducting composite, particularly in combination with one or more high reduction breakdown drafts, to improve composite homogeneity and significantly increase the range of deformation conditions over which dimensional tolerances and Je may be optimized. Precursor composites made by this method exhibit reduced microhardness variability and fewer and less serious transverse filament defects than composites made by prior art methods. The method comprises the steps of: first, providing a precursor article comprising a metal matrix surrounding a plurality of filaments extending along the length of the article and comprising precursors to a desired superconducting ceramic; next, roll working the precursor article during a breakdown stage at a predetermined pressure and a coefficient of friction less than about 0.2, preferably less than 0.01, and preferably less than about 0.001 during each roll working draft, and, then, sintering the rolled article to obtain the desired superconducting ceramic. The coefficient of friction is preferably obtained by interposing a lubricant between the precursor article and one or more rolls, most preferably under conditions which create ideal lubrication conditions.
-
Citations
37 Claims
-
1. A method for manufacturing a multifilamentary superconducting ceramic composite article comprising the steps of:
-
providing a precursor article comprising a plurality of filaments extending along the length of the article and containing precursors to a desired superconducting ceramic, and a metal matrix substantially surrounding each filament;
roll working the precursor article during a breakdown stage at a predetermined pressure and a coefficient of friction less than about 0.2 during each roll working draft, and sintering the rolled article to obtain the desired superconducting ceramic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for manufacturing a multifilamentary superconducting ceramic composite article comprising the steps of:
-
providing a precursor article comprising a plurality of filaments which comprise precursors to a desired superconducting ceramic extending along the length of the article, and a metal matrix substantially surrounding each filament;
roll working the precursor article during a breakdown stage at a predetermined pressure while using a lubricant between the article and one or more rolls during at least one roll working draft; and
,sintering the rolled article to obtain the desired superconducting ceramic. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
-
Specification