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:
May. 09, 1995
Filed:
Oct. 08, 1993
Andre Coulon, Bessoncourt, FR;
GEC Alsthom Electromecanique SA, Paris, FR;
Abstract
A method of nitriding a piece made of titanium alloy, in which a laser beam is directed onto the piece to obtain a small amount of surface melting in the impact zone of the laser, nitrogen under high pressure is blown immediately behind the impact zone of the laser beam so that the nitrogen penetrates into the impact zone once it has become semi-solid, and an inert gas is blown around the nitrogen so as to cover and overlap the laser impact zone. The apparatus of the invention includes a central tube for conveying the nitrogen and a circularly symmetrical duct around the axis of the central tube having inside and outside walls that are conical and that serve to convey the inert gas. The invention serves to obtain a hard surface layer having a thickness of 1 mm to 2 mm.