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:
Mar. 15, 1994
Filed:
Apr. 23, 1993
Young M Lee, Kyungsanbuk-do, KR;
Kyung J Park, Kyungsanbuk-do, KR;
Kil S Churn, Taejon-si, KR;
Woon H Baek, Taejon-si, KR;
Heung S Song, Taejon-si, KR;
Joon W Noh, Taejon-si, KR;
Moon L Hong, Taejon-si, KR;
Seong Lee, Taejon-si, KR;
Eun P Kim, Taejon-si, KR;
Poongsan Corporation, Inchon, KR;
Agency for Defense Development, Taejon-si, KR;
Abstract
A method for heat-treatment of tungsten based alloys, capable of improving impact toughness while keeping tensile strength and elongation. The method comprises maintaining a sintered tungsten based alloy consisting of 86 to 99 weight % tungsten and the balance at least one selected from a group consisting of nickel, iron, copper, cobalt and molybdenum, at a temperature ranged from 950.degree. to 1,350.degree. C. for a maintenance time of one minute to 24 hours, quenching the sintered alloy in water or in oil, and repeating the maintaining and quenching steps.