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:
Sep. 03, 2002
Filed:
Apr. 12, 2001
Junhai Liu, Auburn, AL (US);
Bor Zeng Jang, Auburn, AL (US);
Nanotek Instruments, Inc., Opelika, AL (US);
Abstract
A two-stage method for producing ultra-fine and environmentally stable solid powders from a metal composition including a reactive alloying element. The method includes the steps of: (a) operating a first-stage heating and atomizing means to provide a stream of super-heated fine-sized metal liquid droplets into a chamber of a second-stage atomizing means with the second-stage atomizing means containing a supply of an atomizing fluid medium composed of at least a reactive gas and an inert gas at a predetermined proportion; (b) operating the second-stage atomizing means by directing the atomizing fluid medium into the chamber to impinge upon the stream of super-heated metal liquid droplets to further break up the metal liquid droplets into ultra-fine particles and to allow the reactive gas to react with the reactive alloying element for forming a protective layer on the exterior surface of the particles; and (c) cooling the particles to form ultra-fine solid powders.