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:
Aug. 23, 1988
Filed:
Jan. 25, 1988
Natraj C Iyer, Monroeville, PA (US);
Alan T Male, Murrysville Borough, PA (US);
Sidney J Cherry, Elmira, NY (US);
Robert E Gainer, Monroeville Boro., PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A powdered metallurgical procedure for forming chromium copper contacts used in vacuum circuit interrupters, in which prealloyed powder formed by mixing to copper, chromium of between two to thirty-seven weight percent is rapidly solidified after melting at about 1100.degree. C. to 1500.degree. C. This powder may be blended with additional chromium of between 12 to 50 weight percent with a maximum of fifty-five weight percent of chromium in the final contact structure. This blended mixture may then be either (i) cold pressed at 100,000 psig. and vacuum sintered at 800.degree. to 1400.degree. C.; or (ii) be subjected to hot isostatic pressure of 10,000 to 30,000 psig. at between 700.degree. C. to 1080.degree. C.; or (iii) containing the blended copper-chromium powder and the additional chromium powder into an evacuated can and hot extruding the can between 400.degree. C. to 900.degree. C., to form the contacts.