International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A laser-induced oxidation method for the formation of a TiO2 layer on a Ti substrate was used. The TiO2 phase can be controlled by an Nd:YAG laser with fundamental frequency at an intensity I = 52.8 MW/cm2 and three different doses. Dose D1 = 3.1×1020 phot/cm2 forms a TiO2 layer in the anatase phase, which possesses the highest photocatalytic, antibacterial and adhesion properties. As the laser dose increases, the TiO2 layer thickness increases from 40 nm to 100 nm, but the photocatalytic decomposition reaction constant decreases. The observed super-linear increase of the TiO2 layer thickness with the laser dose is explained by the presence of positive feedback during the irradiation process. The temperature rises with increasing of the thickness due to the interference-caused decrease of the reflection coefficient. As the thickness increases, TiO2 on Ti structure adhesion decreases from 800 mN to 400 mN due to the formation of a layer with a mixture of phases.

In the production of integrated circuit packages, the process of laser monopulse thermal strengthening with beams of special geometry has been researched, developed and implemented to increase the durability of dies for the production of flanges, injection molds, housing rim calibration dies, and automatic stamps for the production of integrated circuits. Laser pulse hardening modes for stamp parts and injection molds have been established. A necessary condition is the presence of a laser emitter, which, according to its technical parameters, allows one to obtain a pulse energy sufficient for thermal strengthening of the contour of the working edges of the part. In order to prevent undesirable effects on the working edges of technological tool parts, a theoretical model of the hardening process has been developed, which allows for the calculation and optimization of laser processing modes to obtain the required operational properties of steel based on a preliminary calculation of temperature fields.

Automated optical scanning systems for analysis of solid surfaces are presented in this work. The prototypes are capable of detecting various parameters and irregularities related to the surfaces of solid bodies by measuring the amplitude of modulated signals of the Electromagnetic Echo Effect. The systems allow various sizes of all kinds of surfaces to be scanned and the results to be visualized on a computer screen. The aim of this work is to present two prototype versions (which use analogue and digital measuring devices) and to show their capabilities. Their general purpose is to scan different areas of specimens and visualize their sensitivity to the Electromagnetic Echo
Effect onto a plot of coordinates but they are also capable of providing valuable information about structural, mechanical and electrical surface parameters.

In this paper are given results of investigations of characteristics of radiation of the compact fiber laser. It is established that at work in pulse and in pulse periodic modes the fiber laser generates enough stably radiation with length of a wave 1,083 microns with peak power to 1,5 ÷ 2 kW. The area of stable generation of radiation is limited to a pumping current 8A. There are shown possibilities of treatment of materials by radiation of the investigated laser.