Efstathios Ioannis Meletis
Engineering at Nelson Dr, Baton Rouge, LA
License number
Louisiana PE.0028201
Issued Date
Jan 26, 1999
Expiration Date
Mar 31, 2003
Category
Civil Engineer
Type
Metallurgical Engineer
Address
Address
166 Nelson Dr, Baton Rouge, LA 70808
Professional information
Titanium Plasma Nitriding Intensified By Thermionic Emission Source
US Patent:
5334264, Aug 2, 1994
Filed:
Jun 30, 1992
Appl. No.:
7/906929
Inventors:
Efstathios I. Meletis - Baton Rouge LA
Assignee:
Board of Supervisors of Louisiana State University and Agricultural and
Mechanical College - Baton Rouge LA
Mechanical College - Baton Rouge LA
International Classification:
C22C 1400, C22C 2700
US Classification:
148222
Abstract:
The present invention relates to ion nitriding of pure titanium or titanium-containing alloys at low pressure by intensifying the glow discharge.
Plasma intensification was produced by thermionic emission in conjunction with a triode glow discharge system. Effective ion nitriding can be achieved by employing the present invention at relatively low temperatures (480. degree. C. ) and with significantly enhanced compound layer growth kinetics compared to the conventional nitriding techniques. Processed Ti and Ti-6Al-4V developed a surface layer of TiN followed by a Ti. sub. 2 N layer and an interstitial nitrogen diffusion zone. Processed specimens showed a three fold increase in surface hardness. Surface roughness was found to be a function of the degree of plasma intensification. Processing of Ti-6Al-4V resulted in a higher wear, corrosion and wear-corrosion resistance.