State of the art nanotechnologies enable the synthesis of Au nanoparticles with good control over their microstructures or forms, achieving different functional properties of the nanoparticles. Recently, a new technique for nanoparticle production is being used more frequently, where the nanoparticles are synthesised by ultrasonic spray pyrolysis (USP). This is a so called aerosol material processing technique which also enables the production of Au nanoparticles.The lecture outlined the mechanisms of Au nanoparticle growth taking place in the USP synthesis, followed by a presentation of the necessary characterization techniques for Au nanoparticles. We also represent preliminary results of some biocompatibility studies of Au nanoparticles, which are a prerequisite for the use of these nanoparticles in biomedical applications. In the final phase, an innovation of the USP device was presented, which presents a possibility for transferring this technology to an industrial level of nanoparticle production at Zlatarna Celje.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 18947606The workshop was prepared within the framework of the project »Internationalization – a development pillar of University of Maribor«. It was held at the Faculty of Mechanical Engineering, University of Maribor in June 2015. The workshop was dedicated to the students of the university of Maribor, researchers and representatives of the companies. The workshop was dealt with the modern technologies in the fields of casting, additive technologies, manufacturing of porous materials with the designed porosity and microstructure, thermal and thermomechanical treatments, as well as with materials management. 12 lecturers actively participated at the workshop; four of them came from abroad (Austria, Turkey, and Sweden). The Slovenian lectures were from universities, institutes and industry.
D.10 Educational activities
COBISS.SI-ID: 82438401Within the current literature there exists a vast amount of data, derived from numerous observations confirming a sluggish bainite formation at low temperatures. This feature is so predominant it is considered an inherent property of the bainite transformation, and has been known as far back as the very first mention of bainite, where the steel was transformed at 200°C in excess of 10 days. The new methodology and alloy design concept of KAB (Kinetically activated bainite) steels enables the formation of carbide free nanostructured bainite in a matter of seconds. The bainite formed within the new grade is very fine and exhibits a hardness between 660 HV1 upon air cooling, which corresponds to tensile strengths of up to 2800 MPa, with predominantly uniform elongations due a pronounced TRIP effect. This contribution focuses on the physical metallurgy of this new steel grade, the formation of the micro structure and the mechanical properties obtained during continuous cooling.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 19091990This paper discusses the application of rapid solidification by the centrifugal atomization method for preparation of thin NdFeB flakes. Metallographic characterization is an important way to evaluate material properties, therefore the effect of alloy composition and different conditions of centrifugal atomization on the microstructure of rapidly solidified NdFeB alloy were investigated. The microstructures and different phases were examined by optical and scanning electron microscopy. Additionally the influence of the processing methods on microstructures of flakes will be discussed.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 18951702Water atomization technology was employed to produce powder forms of frits. These frits were compared to the frits obtained by melting and grinding that is normally the procedure in the enamel industry. Two different compositions were used in this study. The powders were characterized using analytical techniques such as X-ray fluorescence, scanning electron microscopy, differential scanning calorimetry, hot stage microscope, dilatometry and particle size analysis. It was established that the atomized powders had similar chemical compositions as the non-atomized ones, comparable temperatures of transformations and matching coefficients of the linear thermal expansion (α). However, their morphologies and size distributions were different, which was to be expected due to the different procedures used. Nevertheless, the research showed that the atomization technique could be successfully employed for producing powder forms of frits in the enamel industry
B.03 Paper at an international scientific conference
COBISS.SI-ID: 18858006