Ahmed Riedh Al Hamaoy

Al-Nahrain University · Department of Laser and Optoelectronic Engineering

The microhardness of low carbon mild steel was analysed after surface treatment by using carbon dioxide CO₂ and Fibre laser for comparison. Identical input parameters were used to compare the increase between the as-supplied material hardness and the treated surface. Microhardness testing was used to measure the surface hardness and a scanning elec...

In this study, CuCl2 nanoparticles (NPs) synthesised via pulsed laser ablation in liquid (PLAL) were successfully employed to simultaneously detect glutamine and ammonia, with a limit of detection of 20 nM and up to 1500 ppm, respectively. These NPs hold potential for non-invasive diagnosis and monitoring of various health conditions using urine an...

Liquid-assisted laser processing (LALP) is implemented using a 10.6 μm continuous-wave (CW) CO2 laser to drill holes in 1.1 mm thick soda-lime glass substrates fully immersed in a nanoliquid bath. The nanoliquid bath consisted of de-ionized water and carbon nano-particles (CNPs) of different wt.%. The study focuses on the influence of exposure time...

This paper presents the influence of Nano fluid on the CO2 laser drilling of soda-lime glass. The glass thickness of 1.1 mm was immersed 1mm below the Nano fluid using liquid-assisted laser processing (LALP) technique, in order to reduce the temperature gradient, bulges and heat-affected zone (HAZ) region as a method for achieving crack-free glass...

This paper studied the effect of changing the traverse speed of laser on coating thickness after the laser glazing. Glazing process done by using CW CO2 laser of 100W to melt a thin sheet of soda lime glass with 0.15 mm average thickness on AISI 1075 High Carbon Steel sheet. The laser power were (7, 9 and 11)W after many pilot studies, with three t...

Chapter 4 introduces and discusses the influence of processing and laser beam parameters on the results of micro- and nano-laser machining applications. These parameters are categorized into laser beam parameters, material-related parameters, and processing parameters. The chapter, thereafter, gives a deeper discussion of definitions, nature, effec...

In chapter 3, laser–material interaction phenomena are presented for famous laser machining processes. Energy absorption mechanisms are explained with relevance to timescale effects, with description of mathematical and heat conduction models that govern the effects of laser irradiation of materials. The chapter gives a base-understanding for resea...

Laser annealing of gold nanofilms deposited on quartz substrate was performed. RF CO2 laser of variable power in the range 1–20 W with beam quality of 1.1 was used to anneal gold films of 20, 40 and 60 nm thickness. AFM analysis emphasize that smaller nanocrystal sizes of 88 nm was obtained for 20 nm gold film. While optimum absorbance peak exists...

The aim of this paper to study the effect of power on the drilling of soda lima glass (SLG) using under water laser drilling technique. A 1.15 mm thickness SLG sheets were immersed 1mm below the water surface, then irradiated with CW CO2 laser. The laser parameters used were (24, 25 and 26) W power, (5, 7.5 and 10) sec and exposure time and (1, 2an...

The aim of this paper to study the effect of power on the drilling of soda lima glass (SLG) using under water laser drilling technique. A 1.15 mm thickness SLG sheets were immersed 1mm below the water surface, then irradiated with CW CO2 laser. The laser parameters used were (24, 25 and 26) W power, (5, 7.5 and 10) sec and exposure time and (1, 2an...

The optimal combination of aluminum quality, sufficient strength, high stress to weight ratio and clean finish make it a good choice in driveshafts fabrication. This study has been devoted to experimentally investigate the effect of applying laser shock peening (LSP) on the fatigue performance for 6061-T6 aluminum alloy rotary shafts. Q-switched pu...

Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics of the samples were examined using the optical microscope, SEM and hardness examination. Acquired consequences,...

The optimal combination of aluminum quality, sufficient strength, high stress to weight ratio and clean finish make it a good choice in driveshafts fabrication. This study has been devoted to experimentally investigate the effect of applying laser shock peening (LSP) on the fatigue performance for 6061-T6 aluminum alloy rotary shafts. Q-switched pu...

Laser drilling is one of the earliest applications of lasers in materials processing. Less than 0.25mm in diameter are difficult to drilled mechanically. Laser drilling offers good choices for small hole drilling, especially for hard and brittle materials such as ceramics, but cracks appearance is one of the most difficulties that appears in this d...

Glass Ionomer Cement (GIC) is one of the important dental temporary filing materials. The aim of this study is to evaluate the effect of adding 3, 5 and 7 wt. % of TiO2 microparticles to conventional GIC powder (Riva Self Cure) on mechanical properties and its effect on absorption and solubility processes. TiO2 particles additives improved compress...

The aim of the work is to characterize the mechanical properties of glass dental materials Glass Ionomer Cement (GIC) after adding Carbon micro and nano particles with (3, 5 and 7) wt% of the additives into the powder component of (Riva self-cure from SDI limited Australia, shade A1). Compressive strength (Cs), Biaxial Flexural Strength (BFS), Vick...

Glass Ionomer Cement (GIC) is one of the important dental materials used in dental clinics, which is usually used in temporary restorative stages. This study aims to evaluate the effect of adding Al micro particles to GIC powder (Riva self-cure) on the mechanical and physical properties.The results showed that the addition of Al micro particles has...

The aim of this study was to evaluate the effect of adding micro and nano particles of hydroxyapatite (HA) to commercially glass ionomer cement self-cure GIC restorative powder. Compressive strength, biaxial flexural strength, Microhardness and wear rate were investigated for the prepared samples. These additions enhance the mechanical properties o...

The aim of this work is to enhance the mechanical properties of the glass ionomer cement GIC (dental materials) by adding Zirconium Oxide ZrO 2 in both micro and nano particles. GIC were mixed with (3, 5 and 7) wt% of both ZrO 2 micro and nanoparticles separately. Compressive strength (CS), biaxial flexural strength (BFS), Vickers Microhardness (VH...

For many decades, the surface properties of materials have been enhanced by different coatings and surface modification techniques to meet component operational environments. This includes requirements for component life times when subjected to, for example, defined temperature, wearing, or fatigue conditions. In order to enhance the surface proper...

A novel method for the fabrication of microchannels on cyclic olefin polymer (COP) films is presented. COPs are increasingly popular choices as substrate materials as a result of their promising properties, such as good optical transparency in the near ultraviolet (UV) range, high chemical resistance and low water absorption. This paper presents fa...

Laser forming (Bending) process is one of the important forming techniques due to its accurate, noncontact, clean process. During this work the effect of adding Ni particles on the bending of clear glass slides were studied using 150W CW CO2 laser. Three different scanning speeds (20, 30 and 40) mm/s and single or double scans were used as study pa...

A CNC laser machine provided by 1064 nm diode laser was used to weld Polymethyl methacrylate (PMMA) (as a thermoplastic) with different (laser welding time, and specimens clamping pressure) with laser intensity of 558.53 W/cm^2. Two thicknesses (2.50 and 6.00) mm were used in this experiment. Tensile strength test for each welding point was examine...