Increasing Number Of Laser Pulses Research Articles

Selective Crystallization of Ferroelectric HfxZr1–xO2 via Excimer Laser Annealing

Herein, we report the ferroelectricity of HfxZr1–xO2 (HZO) thin films crystallized via excimer laser annealing at 25 °C under atmospheric conditions. We characterized the structure and antiferroelectric/ferroelectric properties of HZO thin films using X-ray diffraction and standard polarization–voltage hysteresis. The laser-annealed Hf0.5Zr0.5O2 thin film was gradually crystallized with increasing laser pulse number. The HZO thin film series exhibited systemic changes in antiferroelectric/ferroelectric properties with variations in Zr concentration. In addition, we constructed a phase diagram of laser-annealed HZO thin films.

Study on Experiment and Simulation for Laser Surface Micro Texturing on Cylinder Piston Ring Friction Pair

Regarding the cylinder piston ring friction pair system as the object , put forward a new numerical simulation method to study the thermal effect mechanism of single pulse interval laser micro texturing. By means of numerical simulation and experimental verification, analysis the variation of laser pulse frequency and laser power on the 45# steel surface micro cavity morphology. The simulation and experimental results show that along with the increase of laser pulse number, the depth of micro cavity increases, the recasting phenomenon of molten metal is obvious, and the machined surface quality decreases. At the same condition, the micro cavity depth simulation results and experimental results are basically the same trend; the maximum error is less than 8%, which proves the feasibility and validity of the numerical simulation method.

Nanosecond Excimer Laser Ablation (W,Ti)C-Co Cemented Carbide

In order to increase the serving life of the cemented carbide, high energy pulsed excimer laser ablation was conducted on the surface of (W,Ti)C-Co cemented carbide cutting tool, and the processing parameters were optimized. The morphology of ablation surface was observed by SEM, composition analysis was applied by EDS. The results showed that with the increase of laser pulse number, the Cobalt binder content in cemented carbide decreased, while the micro-cracks increased. The average microhardness of laser irradiation region increased with increasing pulse number.