Laser nitriding

A method of increasing the surface hardness of a metal comprises locally melting the surface of the metal by laser excitation under a stream of nitrogen and controlling the availability of nitrogen within the field wherein the nitrogen stream is diluted with an inert gas. This method of laser nitrid...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	THOMAS NEVILLE BAKER, SHAHJAHAN MRIDHA
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	A method of increasing the surface hardness of a metal comprises locally melting the surface of the metal by laser excitation under a stream of nitrogen and controlling the availability of nitrogen within the field wherein the nitrogen stream is diluted with an inert gas. This method of laser nitriding results in substantial hardening of the treated metal but eliminates surface defects such as cracks or pores, which occur in prior art techniques. This controlling is achieved by dilution of the nitrogen gas stream with an inert gas, adjusting the flow rate or laser traverse speed. Rotation of the laser beam also eliminates surface defects.