The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2003
Filed:
Mar. 27, 2001
Peter J. Uggowitzer, Ottenbach, CH;
Gian-Carlo Gullo, Zurich, CH;
Markus O. Speidel, Birmenstorf, CH;
Kurt Steinhoff, Burglen, CH;
Ruag Munition, Thun, CH;
Abstract
A process for the production of a material made of a metal alloy for subsequent forming of the material in the semi-solid state, provides that the metal alloy (X) is brought to a starting temperature that is above the liquidus. An additive is added which is capable of reducing an interfacial surface energy between the solid phase and the liquid phase after the metal alloy has been mixed with the additive and transformed into the semi-solid state. The volume fraction of the additive (Z) is selected in such a way that, in the semi-solid material at a liquid phase fraction (f ) of 15% to 75%, the grain size (D) and the degree of skeletization (f C ) during a holding time (t) of more than 15 minutes remain essentially constant in order to retain the formability of a suspension.