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:
Feb. 13, 1979
Filed:
Feb. 06, 1978
Jack Solomon, Rye, NY (US);
Thomas F Kinneman, Peekskill, NY (US);
Union Carbide Corporation, New York, NY (US);
Abstract
In a process for sintering powder metal parts comprising: (a) passing the parts through a furnace adapted therefor from its upstream end to its downstream end, said furnace having two successive zones, an upstream zone, which is maintained at a temperature in the range of about 800.degree. F to about 2200.degree. F and a cooling zone, said furnace further having an atmosphere therein comprising carbon monoxide, hydrogen, carbon dioxide, water and nitrogen distributed throughout the zones; (b) permitting the parts to reside in the upstream zone for a sufficient length of time to cause sintering; and (c) removing the sintered parts from the furnace, the improvement comprising: introducing a mixture consisting essentially Of methanol and nitrogen into the upstream zone at a point where a temperature of at least about 1500.degree. F is maintaied, the methanol and nitrogen being in a ratio sufficient to provide, when subjected to such temperature, an atmosphere comprising, in percent by volume, about 1 to about 20 percent carbon monoxide; and about 1 to about 40 percent hydrogen; and balance nitrogen.