King Fahd University of Petroleum and Minerals

Cihan Karatas

Bekir Sami Yilbas

Syed Sohail Akhtar

Naser Mohammed Al-Aqeeli

A F M Arif

Abdul Aleem B Jabbar

Abdul Aleem Bangalore Jabbar

The method of laser surface treating pre-prepared zirconia surfaces provides for applying an organic resin in a thin, uniform film to a zirconia surface; maintaining the resin-coated zirconia surface in a controlled chamber at approximately 8 bar pressure at a temperature of approximately 175 degrees Centigrade for approximately 2 hours; heating the resin-coated zirconia surface to approximately 400 degrees Centigrade in an inert gas atmosphere, thereby converting the organic resin to carbon; and irradiating the carbon-coated zirconia surface with a laser beam while applying nitrogen under pressure, thereby forming a zirconium carbonitride coating.

Method of laser surface treating pre-prepared zirconia surfaces

The method of carbo-nitriding alumina surfaces is a process for applying a carbo-nitride coating to an alumina or alumina-based composite surface. The method involves the step of applying a phenolic resin to the alumina surface in a thin, uniform film. The resin-coated alumina surface is maintained in a controlled chamber at about 8 bar pressure at a temperature of about 175&#xb0; C. for about 2 hours. The surface is then heated at about 400&#xb0; C. for several hours in an argon atmosphere. This converts the phenolic resin to carbon. The carbon coated alumina surface is then scanned by a laser beam while applying nitrogen under pressure. The end result is the conversion of the alumina at the surface to aluminum carbo-nitride, the oxygen being released in the form of carbon dioxide.

Method of carbo-nitriding alumina surfaces

The method of laser treating Ti-6Al-4V to form surface compounds is a method of forming barrier layers on surfaces of Ti-6Al-4V workpieces. The Ti-6Al-4V workpiece is first cleaned and then a water-soluble phenolic resin is applied to at least one surface of the Ti-6Al-4V workpiece. The Ti-6Al-4V workpiece and the layer(s) of water soluble phenolic resin are then heated to carbonize the phenolic resin, thus forming a carbon film on the at least one surface. TiC particles are then inserted into the carbon film. Following the insertion of the TiC particles, a laser beam is scanned over the at least one surface of the Ti-6Al-4V workpiece. A stream of nitrogen gas is sprayed on the surface of the Ti-6Al-4V workpiece coaxially and simultaneously with the laser beam at a relatively high pressure, thus forming a barrier layer of TiCN, TiN, Ti&#x2014;C, and TiN compounds in the surface region.

Method of laser treating ti-6AI-4V to form surface compounds

The method of nitriding nickel-chromium-based superalloys is a method of forming a nitride barrier layer on a surface of a nickel-chromium-based superalloy workpiece, such as an Inconel&#xae; 718 plate, using gas-assisted laser nitriding. The nickel-chromium-based superalloy workpiece is first cleaned, both with a chemical bath and then through an ultrasonic cleaning process. Following the cleaning of the workpiece, a laser beam is scanned over a surface of the nickel-chromium-based superalloy workpiece. A stream of nitrogen gas, which may be elemental nitrogen or nitrogen in the form of ammonia gas or the like, is sprayed on the surface of the nickel-chromium-based superalloy workpiece coaxially and simultaneously with the laser beam to form the nitride barrier layer.

Method of nitriding nickel-chromium-based superalloys

Laser gas assisted nitriding of alumina surfaces is a process for applying a nitride coating to an alumina or alumina-based composite surface. The method involves the step of applying a phenolic resin to the alumina surface in a thin, uniform film. The resin-coated alumina surface is maintained in a controlled chamber at about 8 bar pressure at a temperature of about 175&#xb0; C. for about 2 hours. The surface is then heated at about 400&#xb0; C. for several hours in an argon atmosphere. This converts the phenolic resin to carbon. The carbon coated alumina surface is then scanned by a 2 kW laser beam while applying nitrogen under pressure. The end result is the conversion of the alumina at the surface to aluminum nitride, the oxygen being released in the form of carbon dioxide.

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Ankara, Turkey

Cihan Karatas