Daniel Petlák

• VSB - Technical University of Ostrava

The possibilities of metallurgical preparation of 40Nb-60Al and 15W-85Al intermetallic compounds (in at.%) by plasma arc melting (PAM) and vacuum induction melting (VIM) were studied. Both methods allow easy preparation of Nb–Al alloys; however, significant evaporation of Al was observed during the melting, which affected the resulting chemical com...

Charakteristika slitin Ni-Al-Mo připravených metodou plazmové metalurgie a elektronového zonálního tavení doc. Ing. Jitka Malcharcziková, Ph.D.; Ing. Martin Pohludka, Ph.D.; prof. Ing. Miroslav Kursa, CSc.; Ing. Daniel Petlák; Ing. Michal Madaj; Ing. Petr Kawulok, Ph.D.; Ing. Rostislav Kawulok, Ph.D.; prof. Ing. Jaromír Drápala, CSc.; doc. Ing. Ivo...

The Sn–Zn–Al system was studied in connection with the possible substitution of lead-based solders for temperatures up to 350 °C. Ternary alloys with up to 3 wt% of aluminium were prepared. The investigated alloys lie close to the monovariant line (eutectic valley) of the Sn–Zn–Al system. The temperatures of phase transitions of six binary Sn–Zn re...

Problems of reactive diffusion at the solid phase and melt contact are studied theoretically. The rate constant is a fundamental parameter characterizing the dissolving rate at a certain configuration of experiment. Relationships between the solid phase dissolving rate, i.e. the solid phase interface boundary movement in the melt, and rates of grow...

Ti-Al intermetallic alloys, especially -TiAl alloys, are perspective materials for high-temperature applications in aerospace, automotive and power industries. However, their mechanical properties highly depend on the obtained microstructure. It was proved that the refinement of grain size leads to improvement of mechanical properties. However, pr...

The aim of this work is an experimental study of lead-free solders. Ternary and binary alloys with different ratios of individual elements Ag, Al, Bi, Cu, In, Mg, Sb, Sn and Zn were prepared experimentally. The study of low-fusing solder alloys was performed with the aspect of observing their selected physical, chemical, structural and technologica...

Problems of reactive diffusion at the solid phase and melt contact were studied theoretically and experimentally. The main intention was to calculate the time course of the solid phase dissolving in the case of cylindrical dissolving. These calculations were carried out on the assumption for the rate constant of dissolving K = const. In our work we...

Problems of reactive diffusion at a solid phase - melt contact were studied theoretically. The main intention was to calculate the time course of the solid phase dissolving in the case of planar dissolving. In our work we give heed especially to the dominating process, which is the solid metal A dissolving in solder melt B. During the dissolving, m...

Some results of the study of Al-Sn-Zn alloys, which can be a possible lead-free solder candidates for high temperature-applications, are presented in this paper. Thirteen ternary Al-Sn-Zn alloys with high chemical and structural homogeneity were prepared in a resistance furnace in evacuated ampoules. The alloys were studied metallographically. Thei...

The paper deals with the basic goals and partial results of the project, which focuses on innovative research of the magnetic lenses and chambers of electron microscopes. This project and paper were created by financial support of state budget through the Ministry of Industry and Trade MPO-CR, project n. FR-TI1/334. This part contains the analysis...