The paper presents the results of the process development of laser surface modification of commercially pure titanium with rhenium. The criterion of the successful/optimal process is the repetitive geometry of the surface, characterized by predictable and repetitive chemical composition over its entire surface as well as special mechanical properties (hardness and wear resistance). The analysis of surface geometry concluded measurements of laser penetration depth and heat affected zone (HAZ), the width of a single track as well as width of a clad. The diode laser installed on the industrial robot carried out the laser treatment. This solution made possible the continuous supply of powder to the substrate during the process. The aim of an investigation is find out the possibility of improving the tribological characteristics of the surface due to the rhenium alloying. The verification of the surface properties (tribological) concluded geometry measurements, microstructure observation, hardness tests and evaluation of wear resistance.
In this paper an alternative method of manufacturing SRR structures through the selective removal of a thin layer of silver-palladium deposited on the surface of the Al2O3 ceramic by laser ablation process using nanosecond Nd:YAG laser (1064 nm) was presented. The SRR structures array were subject to transmittance measurements using the TDS (Time Domain Spectroscopy). Both electric and magnetic resonances were observed at frequencies determined by the structural parameters of the SRR. In case of the E field perpendicular to an SRR structure and one resonance area for 0.56 THz with the E field parallel to the structure, two characteristic resonant dips for 0.31 THz and 0.62 THz were obtained. Studies have confirmed that using selective laser removal process enables the preparation of the resonant structure in the range of THz.
Aluminum nitride (AlN) ceramics has a unique characteristic, namely the ability to form conductive structures on its
surface directly by laser-induced decomposition of the base material. Various research has been carried out on obtaining
low-ohmic structures depending on process parameters such as the laser power, overlap of subsequent pulses and the
type of shielding gas (air, nitrogen and argon). This paper focuses on explaining which factors have the greatest impact
on the resistance (resistivity) value of obtained structures. In order to explain the effect of the laser fluence (below and
above the ablation threshold of aluminum nitride) on the chemical structure of the conductive layers, qualitative EDX
analyses were performed. Optimization of the process allowed obtaining a resistivity of the conductive layers at a level
of ρ = 0.64·10-6 Ω·m, with a thickness of aluminum up to 10 μm (sheet resistance RS = 10 mΩ/Sr). This technology can be
useful in making printed circuit boards (PCB), various types of sensors as well as radio-frequency identification (RFID)
and Lab-On-a-Chip (LOC) structures. This technology can also be useful for the production of metamaterials.