King Fahd University of Petroleum and Minerals

Bekir Sami Yilbas

Cihan Karatas

Haider Ali

Syed Sohail Akhtar

Naser Mohammed Al-Aqeeli

Shahzada Zaman Shuja

Muhammad A Hawwa

Iyad Al-Zaharnah

Iyad T Alzaharnah

Mahmoud Kassas

Saad Bin Mansour

Abul Fazal M Arif

A F M Arif

Abdul Aleem B Jabbar

Adesina Akeem Yusuf

Abdul Aleem Bangalore Jabbar

A method of treating a ceramic surface containing zirconia, whereby the ceramic surface is ablated by directing a laser beam with a diameter of 200-400 &#x3bc;m produced by a COlaser with a pulse frequency of 1200-1800 Hz onto the ceramic surface, and a Nassist gas is concurrently applied with a pressure of 550-650 KPa co-axially with the laser beam to form an ablated ceramic surface comprising microgrooves with ZrN present on a surface of the microgrooves, wherein the ablated ceramic surface has a higher surface hydrophobicity than the ceramic surface prior to the ablating.

Method for hydrophobicizing a zirconia surface

A method of treating a metallic surface comprising a copper alloy, such as phosphor bronze, whereby the metallic surface is ablated by directing a laser beam with a diameter of 200-400 &#x3bc;m produced by a COlaser with a pulse frequency of 1200-1800 HZ onto the metallic surface, and a Nassist gas is concurrently applied with a pressure of 550-650 KPa co-axially with the laser beam to form an ablated metallic surface comprising microgrooves with CuN present on a surface of the microgrooves, wherein the ablated metallic surface has a higher surface hydrophobicity than the metallic surface prior to the ablating.

Method for hydrophobicizing a copper-tin alloy

Laser ablation method for treating a copper alloy containing metallic surface and increasing hydrophobicity

A process for determining the quality of a laser weld-seam, whereby a welded plate and a geometrically equivalent non-welded plate are subjected to a physical impact to generate a natural vibration frequency. The natural vibration frequency of the welded plate and the non-welded plate is then measured with an accelerometer and compared. The uniformity of the weld is then determined by the similarity between the natural vibration frequency of the welded plate and the geometrically equivalent non-welded plate.

Process for determining weld quality using flexural characteristics

Laser ablation method for treating a zirconia containing ceramic surface

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 apparatus and method for controlling laser cutting through surface plasma monitoring provides real-time monitoring and control of laser cutting quality. Laser cutting of a workpiece is controlled through monitoring of surface plasma generation, particularly during a laser gas-assisted cutting process. The apparatus includes a Langmuir probe positioned adjacent the impingement point of the laser beam on the workpiece. The Langmuir probe is in communication with a signal analyzer for measuring electrical voltage generated by plasma generated by the cutting of the workpiece. A controller is provided for comparing the measured electrical voltage with a desired threshold voltage. Control signals are generated to selectively adjust output power of the laser responsive to the compared measured electrical voltage and the desired threshold voltage to minimize plasma generation.

Apparatus and method for controlling laser cutting through surface plasma monitoring

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

The method of modeling flexural characteristics of a bar subjected to local heating utilizes thermal diffusion equations and the finite element method to model vibrational frequency and amplitude variation in a substrate material subjected to local heating. Both heated and non-heated cases are considered.

Method of modeling flexural characteristics of a bar subjected to local heating

The method of modeling fluid flow over porous blocks utilizes heat transfer and fluid flow equations and a discretization numerical method to model heat transfer rates in a square cavity containing a pair of porous blocks. Fluid flow and heat transfer are modeled within a square cavity having an inlet and an outlet formed therethrough. The inlet and outlet are positioned opposite one another along a diagonal of the square cavity. A laminar airflow is introduced at the cavity inlet while a constant heat flux is maintained in the pair of porous blocks.

Method for modeling fluid flow over porous blocks

The method of modeling phase changes due to laser pulse heating utilizes energy equations and a discretizing numerical method to model temperature variation and cavity depth in a substrate material due to laser heating. Both constant and temperature-dependent thermal properties cases are considered.

Method of modeling phase changes due to laser pulse heating

The method of modeling residual stresses during laser cutting utilizes thermal diffusion and stress equations and a discretization numerical method to model temperature variation and residual stresses in a substrate material due to laser cutting therethrough of small-diameter holes.

Method of modeling residual stresses during laser cutting

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.

Growing community of inventors

Dhahran, Saudi Arabia

Bekir Sami Yilbas