Adição de nanopartículas de Ti em matriz de Fe através da deposição por magnetron sputtering

Microalloyed steels constitute a specific class of steel with low amount of carbon and microalloying elements such as Vanadium (V), Niobium (Nb) and Titanium (Ti). The development and application of microalloyed steels and steels in general are limited to the handling of powders with particles of submicron or nanometer dimensions. Therefore, this work presents an alternative in order to construction of microalloyed steels utilizing the deposition by magnetron sputtering technique as a microalloying element addiction in which Ti nanoparticles are dispersed in an iron matrix. The advantage of that technique in relation to the conventional metallurgical processes is the possibility of uniformly disperse the microalloying elements in the iron matrix. It was carried out deposition of Ti onto Fe powder in high CH4, H2, Ar plasma atmosphere, with two deposition times. After the deposition, the iron powder with nanoparticles of Ti dispersed distributed, were compacted and sintered at 1120 ° C in resistive furnace. Characterization techniques utilized in the samples of powder before and after deposition of Ti were Granulometry, Scanning Electron Microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (DRX). In the case of sintered samples, it was carried out characterization by SEM and Vickers Microhardness assays. The results show which the deposition technique by magnetron sputtering is practicable in the dispersion of particles in iron matrix. The EDX microanalysis detected higher percentages of Ti when the deposition were carried out with the inert gas and when the deposition process was carried out with reactive gas. The presence of titanium in iron matrix was also evidenced by the results of X-ray diffraction peaks that showed shifts in the network matrix. Given these results it can be said that the technique of magnetron sputtering deposition is feasible in the dispersion of nanoparticles of iron matrix in Ti.

DEVIDO PROCESSO LEGAL E PROCESSO ADMINISTRATIVO SANCIONADOR NAS AGÊNCIAS REGULADORAS

This paper discusses the growing attention that, over the last decades, has been given to the administrative procedure in Administrative Law, as it also highlights the procedures which are in tune with the new trappings of this legal field. It focuses on the sanctioning competence of regulatory agencies, notably what concerns the procedural guide that conditions its exercise. It aims at gathering varied elements, many times dispersed over the legal system, so it is possible to list, with a satisfactory degree of detail, the procedural constitutional guidelines which are indispensable to the sanctioning of private entities through punitive action by regulatory agencies. It highlights the due legal process clause, for the abundance of the protective set there is around it, as a guiding constitutional principle for the application of sanctions by regulatory agencies. It examines the repercussion of the constitutional principle of the due legal process on Administrative Law, focusing on the most relevant principles on which the first unfolds itself. It analyzes, in light of the due legal process principle, the sanctioning administrative procedure developed in regulatory agencies. In conclusion, it is asserted that there is no room, in the Brazilian legal system as a whole, for sanctions to be applied summarily; that there reigns, in our system, an absolute presumption, dictated by the Constitution, that only through regular procedures can the best and fairest decision, concerning cases in which the rights of private parties could be affected, be taken by the public administration; that, respecting the principle of the right to a fair hearing, it is indispensable that there be motivation of a decision that imposes a sanction; that there should be, in homage to the principle of full defense and for the need to preserve the autonomy of the regulatory party, an appeal court in every agency; that the principles listed in the federal law No. 9.784/1999 should be mandatorily monitored by the agencies, for this is the only alternative consistent with the Constitution