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. 11, 1995
Filed:
Mar. 18, 1992
Gerald A DeVolk, Albuquerque, NM (US);
Printron, Inc., Albuquerque, NM (US);
Abstract
A method for the reduction of oxides in a powder metal requires a predetermined quantity of powder to be loaded into a retort tube or other type of furnace which is pumped down to a vacuum less than about 5.times.10.sup.-6 Torr. The retort is ramped up to a temperature of about 500.degree.-750.degree. C. and maintained at that temperature under high vacuum for about 30-60 minutes to obtain reduction of oxides and de-gasing of copper powders of screen mesh sizes of -100. A hydrogen partial pressure of 150 microns to 20 mm of Hg may be valved into the system from standard grade hydrogen gas 15 minutes into approximately the 30-60 minute hold temperature ramp and then valved off on cooling to 400.degree. C. to improve oxide removal. The system is returned to the high vacuum mode and furnace cooled to room temperature.